1:20 a.m.
Hi Everyone,
I'm about to setup an oVirt cluster with two hosts hitting a Linux
storage server. Since the Linux box can provide the storage in pretty
much any form, I'm wondering which option is "best." Our primary focus
is on reliability, with performance being a close second. Since we will
only be using a single storage server I was thinking NFS would probably
beat out GlusterFS, and that NFSv4 would be a better choice than NFSv3.
I had assumed that that iSCSI would be better performance wise, but from
what I'm seeing online that might not be the case.
Our servers will be using a 1G network backbone for regular traffic
and a dedicated 10G backbone with LACP for redundancy and extra
bandwidth for storage traffic if that makes a difference.
I'll probably try to do some performance benchmarks with 2-3 options,
but the reliability issue is a little harder to test for. Has anyone
had any particularly bad experiences with a particular storage option?
We have been using iSCSI with a Dell MD3x00 SAN and have run into a
bunch of issues with the multipath setup, but that won't be a problem
with the new SAN since it's only got a single controller interface.
2:40 a.m.
On Sat, Mar 25, 2017 at 9:20 AM, Charles Tassell <ctassell(a)gmail.com> wrote:
Hi Everyone,
I'm about to setup an oVirt cluster with two hosts hitting a Linux
storage server. Since the Linux box can provide the storage in pretty much
any form, I'm wondering which option is "best." Our primary focus is on
reliability, with performance being a close second. Since we will only be
using a single storage server I was thinking NFS would probably beat out
GlusterFS, and that NFSv4 would be a better choice than NFSv3. I had
assumed that that iSCSI would be better performance wise, but from what I'm
seeing online that might not be the case.
NFS 4.2 is better than NFS 3 in the sense that you'll get DISCARD support,
which is nice.
Gluster probably requires 3 servers.
In most cases, I don't think people see the difference in performance
between NFS and iSCSI. The theory is that block storage is faster, but in
practice, most don't get to those limits where it matters really.
Our servers will be using a 1G network backbone for regular traffic and
a dedicated 10G backbone with LACP for redundancy and extra bandwidth for
storage traffic if that makes a difference.
LCAP many times (especially on NFS) does not provide extra bandwidth, as
the (single) NFS connection tends to be sticky to a single physical link.
It's one of the reasons I personally prefer iSCSI with multipathing.
I'll probably try to do some performance benchmarks with 2-3 options,
but the reliability issue is a little harder to test for. Has anyone had
any particularly bad experiences with a particular storage option? We have
been using iSCSI with a Dell MD3x00 SAN and have run into a bunch of issues
with the multipath setup, but that won't be a problem with the new SAN
since it's only got a single controller interface.
A single controller is not very reliable. If reliability is your primary
concern, I suggest ensuring there is no single point of failure - or at
least you are aware of all of them (does the storage server have redundant
power supply? to two power sources? Of course in some scenarios it's an
overkill and perhaps not practical, but you should be aware of your weak
spots).
I'd stick with what you are most comfortable managing - creating, backing
up, extending, verifying health, etc.
Y.
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
3:42 p.m.
But on the Dell MD32x00 you have got two controllers. The trick is that you
have to sustain link to both controllers, so the best option is to use
multipath as Yaniv said. Otherwise you get an error notifications from the
array.
The problem is with iSCSI target.
After server reboot, VDSM tries to connect to target which was previously
set, but it could be inactive.
So in that case you have to remember to edit configuration in vdsm.conf,
because vdsm.conf do not accept target with multi IP addresses.
2017-03-26 9:40 GMT+02:00 Yaniv Kaul <ykaul(a)redhat.com>:
On Sat, Mar 25, 2017 at 9:20 AM, Charles Tassell <ctassell(a)gmail.com>
wrote:
> Hi Everyone,
>
> I'm about to setup an oVirt cluster with two hosts hitting a Linux
> storage server. Since the Linux box can provide the storage in pretty much
> any form, I'm wondering which option is "best." Our primary focus is
on
> reliability, with performance being a close second. Since we will only be
> using a single storage server I was thinking NFS would probably beat out
> GlusterFS, and that NFSv4 would be a better choice than NFSv3. I had
> assumed that that iSCSI would be better performance wise, but from what I'm
> seeing online that might not be the case.
>
NFS 4.2 is better than NFS 3 in the sense that you'll get DISCARD support,
which is nice.
Gluster probably requires 3 servers.
In most cases, I don't think people see the difference in performance
between NFS and iSCSI. The theory is that block storage is faster, but in
practice, most don't get to those limits where it matters really.
>
> Our servers will be using a 1G network backbone for regular traffic and
> a dedicated 10G backbone with LACP for redundancy and extra bandwidth for
> storage traffic if that makes a difference.
>
LCAP many times (especially on NFS) does not provide extra bandwidth, as
the (single) NFS connection tends to be sticky to a single physical link.
It's one of the reasons I personally prefer iSCSI with multipathing.
>
> I'll probably try to do some performance benchmarks with 2-3 options,
> but the reliability issue is a little harder to test for. Has anyone had
> any particularly bad experiences with a particular storage option? We have
> been using iSCSI with a Dell MD3x00 SAN and have run into a bunch of issues
> with the multipath setup, but that won't be a problem with the new SAN
> since it's only got a single controller interface.
>
A single controller is not very reliable. If reliability is your primary
concern, I suggest ensuring there is no single point of failure - or at
least you are aware of all of them (does the storage server have redundant
power supply? to two power sources? Of course in some scenarios it's an
overkill and perhaps not practical, but you should be aware of your weak
spots).
I'd stick with what you are most comfortable managing - creating, backing
up, extending, verifying health, etc.
Y.
>
> _______________________________________________
> Users mailing list
> Users(a)ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
9:33 a.m.
This is a multi-part message in MIME format.
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Hi Marcin,
Hmm, so if you are using multipath with VDSM you have to manually
edit the vdsm.conf file to put the right IP in every time the active
controller switches? That sort of defeats the purpose of multipath....
That was the issue we were having: we'd spin up another host, it would
connect to the SAN which would then reballance the disks among
controllers, and all our other hosts would lose their connection to the
active controller and pause all of the VMs. It's the "Device is not on
preferred path" issue that is common on the MD3x00 line. We had the
same errors with VMWare, but VMWare was able to automatically switch to
the active path.
On 2017-03-26 05:42 PM, Marcin Kruk wrote:
But on the Dell MD32x00 you have got two controllers. The trick is
that you have to sustain link to both controllers, so the best option
is to use multipath as Yaniv said. Otherwise you get an error
notifications from the array.
The problem is with iSCSI target.
After server reboot, VDSM tries to connect to target which was
previously set, but it could be inactive.
So in that case you have to remember to edit configuration in
vdsm.conf, because vdsm.conf do not accept target with multi IP addresses.
2017-03-26 9:40 GMT+02:00 Yaniv Kaul <ykaul(a)redhat.com
<mailto:ykaul@redhat.com>>:
On Sat, Mar 25, 2017 at 9:20 AM, Charles Tassell
<ctassell(a)gmail.com <mailto:ctassell@gmail.com>> wrote:
Hi Everyone,
I'm about to setup an oVirt cluster with two hosts hitting a
Linux storage server. Since the Linux box can provide the
storage in pretty much any form, I'm wondering which option is
"best." Our primary focus is on reliability, with performance
being a close second. Since we will only be using a single
storage server I was thinking NFS would probably beat out
GlusterFS, and that NFSv4 would be a better choice than
NFSv3. I had assumed that that iSCSI would be better
performance wise, but from what I'm seeing online that might
not be the case.
NFS 4.2 is better than NFS 3 in the sense that you'll get DISCARD
support, which is nice.
Gluster probably requires 3 servers.
In most cases, I don't think people see the difference in
performance between NFS and iSCSI. The theory is that block
storage is faster, but in practice, most don't get to those limits
where it matters really.
Our servers will be using a 1G network backbone for regular
traffic and a dedicated 10G backbone with LACP for redundancy
and extra bandwidth for storage traffic if that makes a
difference.
LCAP many times (especially on NFS) does not provide extra
bandwidth, as the (single) NFS connection tends to be sticky to a
single physical link.
It's one of the reasons I personally prefer iSCSI with multipathing.
I'll probably try to do some performance benchmarks with 2-3
options, but the reliability issue is a little harder to test
for. Has anyone had any particularly bad experiences with a
particular storage option? We have been using iSCSI with a
Dell MD3x00 SAN and have run into a bunch of issues with the
multipath setup, but that won't be a problem with the new SAN
since it's only got a single controller interface.
A single controller is not very reliable. If reliability is your
primary concern, I suggest ensuring there is no single point of
failure - or at least you are aware of all of them (does the
storage server have redundant power supply? to two power sources?
Of course in some scenarios it's an overkill and perhaps not
practical, but you should be aware of your weak spots).
I'd stick with what you are most comfortable managing - creating,
backing up, extending, verifying health, etc.
Y.
_______________________________________________
Users mailing list
Users(a)ovirt.org <mailto:Users@ovirt.org>
http://lists.ovirt.org/mailman/listinfo/users
<http://lists.ovirt.org/mailman/listinfo/users>
_______________________________________________
Users mailing list
Users(a)ovirt.org <mailto:Users@ovirt.org>
http://lists.ovirt.org/mailman/listinfo/users
<http://lists.ovirt.org/mailman/listinfo/users>
--------------A8E57FF88753DC01914C0685
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<html>
<head>
<meta content="text/html; charset=utf-8"
http-equiv="Content-Type">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<div class="moz-cite-prefix">Hi Marcin,<br>
<br>
Hmm, so if you are using multipath with VDSM you have to
manually edit the vdsm.conf file to put the right IP in every time
the active controller switches? That sort of defeats the purpose
of multipath.... That was the issue we were having: we'd spin up
another host, it would connect to the SAN which would then
reballance the disks among controllers, and all our other hosts
would lose their connection to the active controller and pause all
of the VMs. It's the "Device is not on preferred path" issue that
is common on the MD3x00 line. We had the same errors with VMWare,
but VMWare was able to automatically switch to the active path.<br>
<br>
On 2017-03-26 05:42 PM, Marcin Kruk wrote:<br>
</div>
<blockquote
cite="mid:CAFJSZpSb_ZVHB0uvOPTFmAdEVCpHHuMk1Vj0zVZ+jdX2=A=R5Q@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>But on the Dell MD32x00 you have got two controllers. The
trick is that you have to sustain link to both controllers, so
the best option is to use multipath as Yaniv said. Otherwise
you get an error notifications from the array.<br>
</div>
The problem is with iSCSI target.<br>
After server reboot, VDSM tries to connect to target which was
previously set, but it could be inactive.<br>
So in that case you have to remember to edit configuration in
vdsm.conf, because vdsm.conf do not accept target with multi IP
addresses.<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">2017-03-26 9:40 GMT+02:00 Yaniv Kaul
<span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:ykaul@redhat.com"
target="_blank">ykaul@redhat.com</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><br>
<div class="gmail_extra"><br>
<div class="gmail_quote"><span class="">On
Sat, Mar 25,
2017 at 9:20 AM, Charles Tassell <span
dir="ltr"><<a
moz-do-not-send="true"
href="mailto:ctassell@gmail.com"
target="_blank">ctassell(a)gmail.com</a>&gt;</span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi
Everyone,<br>
<br>
I'm about to setup an oVirt cluster with two
hosts hitting a Linux storage server. Since the
Linux box can provide the storage in pretty much
any form, I'm wondering which option is "best."
Our primary focus is on reliability, with
performance being a close second. Since we will
only be using a single storage server I was
thinking NFS would probably beat out GlusterFS,
and that NFSv4 would be a better choice than
NFSv3. I had assumed that that iSCSI would be
better performance wise, but from what I'm seeing
online that might not be the case.<br>
</blockquote>
<div><br>
</div>
</span>
<div>NFS 4.2 is better than NFS 3 in the sense that
you'll get DISCARD support, which is nice.</div>
<div>Gluster probably requires 3 servers.</div>
<div>In most cases, I don't think people see the
difference in performance between NFS and iSCSI. The
theory is that block storage is faster, but in
practice, most don't get to those limits where it
matters really.</div>
<span class="">
<div> </div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
Our servers will be using a 1G network backbone
for regular traffic and a dedicated 10G backbone
with LACP for redundancy and extra bandwidth for
storage traffic if that makes a difference.<br>
</blockquote>
<div><br>
</div>
</span>
<div>LCAP many times (especially on NFS) does not
provide extra bandwidth, as the (single) NFS
connection tends to be sticky to a single physical
link.</div>
<div>It's one of the reasons I personally prefer iSCSI
with multipathing.</div>
<span class="">
<div> </div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
I'll probably try to do some performance
benchmarks with 2-3 options, but the reliability
issue is a little harder to test for. Has anyone
had any particularly bad experiences with a
particular storage option? We have been using
iSCSI with a Dell MD3x00 SAN and have run into a
bunch of issues with the multipath setup, but that
won't be a problem with the new SAN since it's
only got a single controller interface.<br>
</blockquote>
<div><br>
</div>
</span>
<div>A single controller is not very reliable. If
reliability is your primary concern, I suggest
ensuring there is no single point of failure - or at
least you are aware of all of them (does the storage
server have redundant power supply? to two power
sources? Of course in some scenarios it's an
overkill and perhaps not practical, but you should
be aware of your weak spots).</div>
<div><br>
</div>
<div>I'd stick with what you are most comfortable
managing - creating, backing up, extending,
verifying health, etc.</div>
<span class="HOEnZb"><font
color="#888888">
<div>Y.</div>
</font></span><span class="">
<div><br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
<br>
______________________________<wbr>_________________<br>
Users mailing list<br>
<a moz-do-not-send="true"
href="mailto:Users@ovirt.org"
target="_blank">Users(a)ovirt.org</a><br>
<a moz-do-not-send="true"
href="http://lists.ovirt.org/mailman/listinfo/users"
rel="noreferrer"
target="_blank">http://lists.ovirt.org/mailman<wbr>/li...
</blockquote>
</span></div>
<br>
</div>
</div>
<br>
______________________________<wbr>_________________<br>
Users mailing list<br>
<a moz-do-not-send="true"
href="mailto:Users@ovirt.org">Users@ovirt.org</a><br>
<a moz-do-not-send="true"
href="http://lists.ovirt.org/mailman/listinfo/users"
rel="noreferrer"
target="_blank">http://lists.ovirt.org/<wbr>mailman/li...
<br>
</blockquote>
</div>
<br>
</div>
</blockquote>
<p><br>
</p>
</body>
</html>
--------------A8E57FF88753DC01914C0685--
4:32 p.m.
No. You have to edit vdsm.conf, when:
1) link will be broken, and it point to the iSCSI target IP and
2) you want to reboot your host or restart VDSM
I don't know, why but VDSM during startup tries to connect to IP target in
my opinion it should use the /var/lib/iscsi configuration which was set
previously.
I also had problem "Device is not on preferred path", but I edited
multipath.conf file and set the round-robin alghoritm, because during
installation multipathd.conf was changed.
If you want to get right configuration to your array execute:
1) multipath -k #console mode
2) show config #find the proper configuration to your array
3) modify multipath.conf and put above configuration.
1:57 p.m.
Was reading over this post to the group about storage options. I am more of
a windows guy as appose to a linux guy, but am learning quickly and had a
question. You said that LACP will not provide extra band with (Especially
with NFS). Does the same hold true with GlusterFS. We are currently using
GlusterFS for the file replication piece. Does Glusterfs take advantage of
any multipathing?
Thanks
-----Original Message-----
From: Yaniv Kaul <ykaul(a)redhat.com>
To: Charles Tassell <ctassell(a)gmail.com>
Cc: users <users(a)ovirt.org>
Date: Sun, 26 Mar 2017 10:40:00 +0300
Subject: Re: [ovirt-users] Best Storage Option: iSCSI/NFS/GlusterFS?
On Sat, Mar 25, 2017 at 9:20 AM, Charles Tassell <ctassell(a)gmail.com> wrote:
Hi Everyone,
I'm about to setup an oVirt cluster with two hosts hitting a Linux storage
server. Since the Linux box can provide the storage in pretty much any
form, I'm wondering which option is "best." Our primary focus is on
reliability, with performance being a close second. Since we will only be
using a single storage server I was thinking NFS would probably beat out
GlusterFS, and that NFSv4 would be a better choice than NFSv3. I had
assumed that that iSCSI would be better performance wise, but from what I'm
seeing online that might not be the case.
NFS 4.2 is better than NFS 3 in the sense that you'll get DISCARD support,
which is nice.
Gluster probably requires 3 servers.
In most cases, I don't think people see the difference in performance
between NFS and iSCSI. The theory is that block storage is faster, but in
practice, most don't get to those limits where it matters really.
Our servers will be using a 1G network backbone for regular traffic and a
dedicated 10G backbone with LACP for redundancy and extra bandwidth for
storage traffic if that makes a difference.
LCAP many times (especially on NFS) does not provide extra bandwidth, as the
(single) NFS connection tends to be sticky to a single physical link.
It's one of the reasons I personally prefer iSCSI with multipathing.
I'll probably try to do some performance benchmarks with 2-3 options, but
the reliability issue is a little harder to test for. Has anyone had any
particularly bad experiences with a particular storage option? We have been
using iSCSI with a Dell MD3x00 SAN and have run into a bunch of issues with
the multipath setup, but that won't be a problem with the new SAN since it's
only got a single controller interface.
A single controller is not very reliable. If reliability is your primary
concern, I suggest ensuring there is no single point of failure - or at
least you are aware of all of them (does the storage server have redundant
power supply? to two power sources? Of course in some scenarios it's an
overkill and perhaps not practical, but you should be aware of your weak
spots).
I'd stick with what you are most comfortable managing - creating, backing
up, extending, verifying health, etc.
Y.
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
2:41 a.m.
On Tue, Apr 18, 2017 at 9:57 PM, Bryan Sockel <Bryan.Sockel(a)altn.com> wrote:
Was reading over this post to the group about storage options. I am
more
of a windows guy as appose to a linux guy, but am learning quickly and had
a question. You said that LACP will not provide extra band with
(Especially with NFS). Does the same hold true with GlusterFS. We are
currently using GlusterFS for the file replication piece. Does Glusterfs
take advantage of any multipathing?
Thanks
I'd expect Gluster to take advantage of LACP, as it has replication to
multiple peers (as opposed to NFS). See[1].
Y.
[1]
https://gluster.readthedocs.io/en/latest/Administrator%20Guide/Network%20...
-----Original Message-----
From: Yaniv Kaul <ykaul(a)redhat.com>
To: Charles Tassell <ctassell(a)gmail.com>
Cc: users <users(a)ovirt.org>
Date: Sun, 26 Mar 2017 10:40:00 +0300
Subject: Re: [ovirt-users] Best Storage Option: iSCSI/NFS/GlusterFS?
On Sat, Mar 25, 2017 at 9:20 AM, Charles Tassell <ctassell(a)gmail.com>
wrote:
>
> Hi Everyone,
>
> I'm about to setup an oVirt cluster with two hosts hitting a Linux
> storage server. Since the Linux box can provide the storage in pretty much
> any form, I'm wondering which option is "best." Our primary focus is
on
> reliability, with performance being a close second. Since we will only be
> using a single storage server I was thinking NFS would probably beat out
> GlusterFS, and that NFSv4 would be a better choice than NFSv3. I had
> assumed that that iSCSI would be better performance wise, but from what I'm
> seeing online that might not be the case.
NFS 4.2 is better than NFS 3 in the sense that you'll get DISCARD support,
which is nice.
Gluster probably requires 3 servers.
In most cases, I don't think people see the difference in performance
between NFS and iSCSI. The theory is that block storage is faster, but in
practice, most don't get to those limits where it matters really.
>
> Our servers will be using a 1G network backbone for regular traffic and
> a dedicated 10G backbone with LACP for redundancy and extra bandwidth for
> storage traffic if that makes a difference.
LCAP many times (especially on NFS) does not provide extra bandwidth, as
the (single) NFS connection tends to be sticky to a single physical link.
It's one of the reasons I personally prefer iSCSI with multipathing.
>
> I'll probably try to do some performance benchmarks with 2-3 options,
> but the reliability issue is a little harder to test for. Has anyone had
> any particularly bad experiences with a particular storage option? We have
> been using iSCSI with a Dell MD3x00 SAN and have run into a bunch of issues
> with the multipath setup, but that won't be a problem with the new SAN
> since it's only got a single controller interface.
A single controller is not very reliable. If reliability is your primary
concern, I suggest ensuring there is no single point of failure - or at
least you are aware of all of them (does the storage server have redundant
power supply? to two power sources? Of course in some scenarios it's an
overkill and perhaps not practical, but you should be aware of your weak
spots).
I'd stick with what you are most comfortable managing - creating, backing
up, extending, verifying health, etc.
Y.
>
>
> _______________________________________________
> Users mailing list
> Users(a)ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
9:07 a.m.
Thank you for the information, i did check my servers this morning, in total
i have 4 servers configured as part of my ovirt deployment, two
virtualization servers and 2 gluster servers, with one of the virtualization
being the arbiter for my gluster replicated storage.
From what i can see on my 2 dedicated gluster boxes i see traffic
going out
over multiple links. On both of my virtualization hosts i am seeing all
traffic go out via em1, and no traffic going out over the other interfaces.
All four interfaces are configured in a single bond as 802.3ad on both hosts
with my logical networks attached to the bond.
-----Original Message-----
From: Yaniv Kaul <ykaul(a)redhat.com>
To: Bryan Sockel <Bryan.Sockel(a)altn.com>
Cc: users <users(a)ovirt.org>
Date: Wed, 19 Apr 2017 10:41:40 +0300
Subject: Re: [ovirt-users] Best Storage Option: iSCSI/NFS/GlusterFS?
On Tue, Apr 18, 2017 at 9:57 PM, Bryan Sockel <Bryan.Sockel(a)altn.com> wrote:
Was reading over this post to the group about storage options. I am more of
a windows guy as appose to a linux guy, but am learning quickly and had a
question. You said that LACP will not provide extra band with (Especially
with NFS). Does the same hold true with GlusterFS. We are currently using
GlusterFS for the file replication piece. Does Glusterfs take advantage of
any multipathing?
Thanks
I'd expect Gluster to take advantage of LACP, as it has replication to
multiple peers (as opposed to NFS). See[1].
Y.
[1]
https://gluster.readthedocs.io/en/latest/Administrator%20Guide/Network%20...
-----Original Message-----
From: Yaniv Kaul <ykaul(a)redhat.com>
To: Charles Tassell <ctassell(a)gmail.com>
Cc: users <users(a)ovirt.org>
Date: Sun, 26 Mar 2017 10:40:00 +0300
Subject: Re: [ovirt-users] Best Storage Option: iSCSI/NFS/GlusterFS?
On Sat, Mar 25, 2017 at 9:20 AM, Charles Tassell <ctassell(a)gmail.com> wrote:
Hi Everyone,
I'm about to setup an oVirt cluster with two hosts hitting a Linux storage
server. Since the Linux box can provide the storage in pretty much any
form, I'm wondering which option is "best." Our primary focus is on
reliability, with performance being a close second. Since we will only be
using a single storage server I was thinking NFS would probably beat out
GlusterFS, and that NFSv4 would be a better choice than NFSv3. I had
assumed that that iSCSI would be better performance wise, but from what I'm
seeing online that might not be the case.
NFS 4.2 is better than NFS 3 in the sense that you'll get DISCARD support,
which is nice.
Gluster probably requires 3 servers.
In most cases, I don't think people see the difference in performance
between NFS and iSCSI. The theory is that block storage is faster, but in
practice, most don't get to those limits where it matters really.
Our servers will be using a 1G network backbone for regular traffic and a
dedicated 10G backbone with LACP for redundancy and extra bandwidth for
storage traffic if that makes a difference.
LCAP many times (especially on NFS) does not provide extra bandwidth, as the
(single) NFS connection tends to be sticky to a single physical link.
It's one of the reasons I personally prefer iSCSI with multipathing.
I'll probably try to do some performance benchmarks with 2-3 options, but
the reliability issue is a little harder to test for. Has anyone had any
particularly bad experiences with a particular storage option? We have been
using iSCSI with a Dell MD3x00 SAN and have run into a bunch of issues with
the multipath setup, but that won't be a problem with the new SAN since it's
only got a single controller interface.
A single controller is not very reliable. If reliability is your primary
concern, I suggest ensuring there is no single point of failure - or at
least you are aware of all of them (does the storage server have redundant
power supply? to two power sources? Of course in some scenarios it's an
overkill and perhaps not practical, but you should be aware of your weak
spots).
I'd stick with what you are most comfortable managing - creating, backing
up, extending, verifying health, etc.
Y.
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12:09 p.m.
On Wed, Apr 19, 2017 at 5:07 PM, Bryan Sockel <Bryan.Sockel(a)altn.com> wrote:
Thank you for the information, i did check my servers this morning,
in
total i have 4 servers configured as part of my ovirt deployment, two
virtualization servers and 2 gluster servers, with one of the
virtualization being the arbiter for my gluster replicated storage.
From what i can see on my 2 dedicated gluster boxes i see traffic going
out over multiple links. On both of my virtualization hosts i am seeing
all traffic go out via em1, and no traffic going out over the other
interfaces. All four interfaces are configured in a single bond as 802.3ad
on both hosts with my logical networks attached to the bond.
the balancing is based on hash with either L2+L3, or L3+L4. It may well be
that both end up with the same hash and therefore go through the same link.
Y.
-----Original Message-----
From: Yaniv Kaul <ykaul(a)redhat.com>
To: Bryan Sockel <Bryan.Sockel(a)altn.com>
Cc: users <users(a)ovirt.org>
Date: Wed, 19 Apr 2017 10:41:40 +0300
Subject: Re: [ovirt-users] Best Storage Option: iSCSI/NFS/GlusterFS?
On Tue, Apr 18, 2017 at 9:57 PM, Bryan Sockel <Bryan.Sockel(a)altn.com>
wrote:
>
> Was reading over this post to the group about storage options. I am more
> of a windows guy as appose to a linux guy, but am learning quickly and had
> a question. You said that LACP will not provide extra band with
> (Especially with NFS). Does the same hold true with GlusterFS. We are
> currently using GlusterFS for the file replication piece. Does Glusterfs
> take advantage of any multipathing?
>
> Thanks
>
>
I'd expect Gluster to take advantage of LACP, as it has replication to
multiple peers (as opposed to NFS). See[1].
Y.
[1] https://gluster.readthedocs.io/en/latest/Administrator%
20Guide/Network%20Configurations%20Techniques/
>
>
> -----Original Message-----
> From: Yaniv Kaul <ykaul(a)redhat.com>
> To: Charles Tassell <ctassell(a)gmail.com>
> Cc: users <users(a)ovirt.org>
> Date: Sun, 26 Mar 2017 10:40:00 +0300
> Subject: Re: [ovirt-users] Best Storage Option: iSCSI/NFS/GlusterFS?
>
>
>
> On Sat, Mar 25, 2017 at 9:20 AM, Charles Tassell <ctassell(a)gmail.com>
> wrote:
>>
>> Hi Everyone,
>>
>> I'm about to setup an oVirt cluster with two hosts hitting a Linux
>> storage server. Since the Linux box can provide the storage in pretty much
>> any form, I'm wondering which option is "best." Our primary focus
is on
>> reliability, with performance being a close second. Since we will only be
>> using a single storage server I was thinking NFS would probably beat out
>> GlusterFS, and that NFSv4 would be a better choice than NFSv3. I had
>> assumed that that iSCSI would be better performance wise, but from what I'm
>> seeing online that might not be the case.
>
>
> NFS 4.2 is better than NFS 3 in the sense that you'll get DISCARD
> support, which is nice.
> Gluster probably requires 3 servers.
> In most cases, I don't think people see the difference in performance
> between NFS and iSCSI. The theory is that block storage is faster, but in
> practice, most don't get to those limits where it matters really.
>
>
>>
>> Our servers will be using a 1G network backbone for regular traffic
>> and a dedicated 10G backbone with LACP for redundancy and extra bandwidth
>> for storage traffic if that makes a difference.
>
>
> LCAP many times (especially on NFS) does not provide extra bandwidth, as
> the (single) NFS connection tends to be sticky to a single physical link.
> It's one of the reasons I personally prefer iSCSI with multipathing.
>
>
>>
>> I'll probably try to do some performance benchmarks with 2-3 options,
>> but the reliability issue is a little harder to test for. Has anyone had
>> any particularly bad experiences with a particular storage option? We have
>> been using iSCSI with a Dell MD3x00 SAN and have run into a bunch of issues
>> with the multipath setup, but that won't be a problem with the new SAN
>> since it's only got a single controller interface.
>
>
> A single controller is not very reliable. If reliability is your primary
> concern, I suggest ensuring there is no single point of failure - or at
> least you are aware of all of them (does the storage server have redundant
> power supply? to two power sources? Of course in some scenarios it's an
> overkill and perhaps not practical, but you should be aware of your weak
> spots).
>
> I'd stick with what you are most comfortable managing - creating, backing
> up, extending, verifying health, etc.
> Y.
>
>
>>
>>
>> _______________________________________________
>> Users mailing list
>> Users(a)ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>
>
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8 comments
4 participants
participants (4)
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Bryan Sockel -
Charles Tassell -
Marcin Kruk -
Yaniv Kaul