9:04 p.m.
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I currently have a new setup running ovirt 3.3.3. I have a Gluster storage
domain with roughly 2.5TB of usable space. Gluster is installed on the same
systems as the ovirt hosts. The host break down is as follows
Ovirt DC:
4 hosts in the cluster. Each host has 4 physical disks in a RAID 5. Each
disk is 500GB. With the OS installed and configured I end up with 1.2TB of
usable space left for my data volume
Gluster volume:
4 bricks with 1.2TB of space per brick (Distribute Replicate leaves me with
about 2.5TB in the storage domain)
Does this setup give me enough fault tolerance to survive losing a host and
have my HA vm automatically move to an available host and keep running??
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link=3D"#0563C1" vlink=3D"#954F72"><div
class=3DWordSection1><p =
class=3DMsoNormal>I currently have a new setup running ovirt 3.3.3. I =
have a Gluster storage domain with roughly 2.5TB of usable space. =
Gluster is installed on the same systems as the ovirt hosts. The =
host break down is as follows<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p
class=3DMsoNormal>Ovirt =
DC:<o:p></o:p></p><p class=3DMsoNormal>4 hosts in the cluster.
Each host =
has 4 physical disks in a RAID 5. Each disk is 500GB. With the OS =
installed and configured I end up with 1.2TB of usable space left for my =
data volume<o:p></o:p></p><p
class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>Gluster volume:<o:p></o:p></p><p
class=3DMsoNormal>4 =
bricks with 1.2TB of space per brick (Distribute Replicate leaves me =
with about 2.5TB in the storage domain)<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p
class=3DMsoNormal>Does this =
setup give me enough fault tolerance to survive losing a host and have =
my HA vm automatically move to an available host and keep =
running??<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p></div></body></html>
------=_NextPart_000_00FD_01CF22B5.E5FD9560--
9:17 p.m.
There was another recent post about this but a sum up was:
You must have power fencing to support VM HA otherwise they'll be an issue
with the engine not knowing whether the VM is still running and not bring
it up on a new host to avoid data corruption. Also make sure you have your
quorum setup properly based on your replication scenario so you can
withstand 1 host being lost.
I don't believe they'll "keep running" in a sense because of the host
being
lost, but they would restart on another host. At least that's what I've
noticed in my case.
On Thu, Feb 6, 2014 at 1:04 PM, Maurice James <midnightsteel(a)msn.com> wrote:
I currently have a new setup running ovirt 3.3.3. I have a Gluster
storage
domain with roughly 2.5TB of usable space. Gluster is installed on the
same systems as the ovirt hosts. The host break down is as follows
Ovirt DC:
4 hosts in the cluster. Each host has 4 physical disks in a RAID 5. Each
disk is 500GB. With the OS installed and configured I end up with 1.2TB of
usable space left for my data volume
Gluster volume:
4 bricks with 1.2TB of space per brick (Distribute Replicate leaves me
with about 2.5TB in the storage domain)
Does this setup give me enough fault tolerance to survive losing a host
and have my HA vm automatically move to an available host and keep running??
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
9:21 p.m.
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Hmm. So in that case would I be able to drop the Gluster setup and use NFS
each host and make sure power fencing is enabled? Will that still achieve
fault tolerance, or is a replicated gluster still required?
From: Andrew Lau [mailto:andrew@andrewklau.com]
Sent: Wednesday, February 05, 2014 9:17 PM
To: Maurice James
Cc: users
Subject: Re: [Users] Gluster question
There was another recent post about this but a sum up was:
You must have power fencing to support VM HA otherwise they'll be an issue
with the engine not knowing whether the VM is still running and not bring it
up on a new host to avoid data corruption. Also make sure you have your
quorum setup properly based on your replication scenario so you can
withstand 1 host being lost.
I don't believe they'll "keep running" in a sense because of the host
being
lost, but they would restart on another host. At least that's what I've
noticed in my case.
On Thu, Feb 6, 2014 at 1:04 PM, Maurice James <midnightsteel(a)msn.com
<mailto:midnightsteel@msn.com> > wrote:
I currently have a new setup running ovirt 3.3.3. I have a Gluster storage
domain with roughly 2.5TB of usable space. Gluster is installed on the same
systems as the ovirt hosts. The host break down is as follows
Ovirt DC:
4 hosts in the cluster. Each host has 4 physical disks in a RAID 5. Each
disk is 500GB. With the OS installed and configured I end up with 1.2TB of
usable space left for my data volume
Gluster volume:
4 bricks with 1.2TB of space per brick (Distribute Replicate leaves me with
about 2.5TB in the storage domain)
Does this setup give me enough fault tolerance to survive losing a host and
have my HA vm automatically move to an available host and keep running??
_______________________________________________
Users mailing list
Users(a)ovirt.org <mailto:Users@ovirt.org>
http://lists.ovirt.org/mailman/listinfo/users
------=_NextPart_000_011F_01CF22B8.338C6700
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link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Hmm. So in that case would I be able to drop the Gluster setup and =
use NFS each host and make sure power fencing is enabled? Will that =
still achieve fault tolerance, or is a replicated gluster still =
required?<o:p></o:p></span></p><p class=3DMsoNormal><span
=
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p> </o:p></span></p><p
class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>From:</span=
</b><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>
Andrew =
Lau [mailto:andrew@andrewklau.com] <br><b>Sent:</b> Wednesday, February
=
05, 2014 9:17 PM<br><b>To:</b> Maurice
James<br><b>Cc:</b> =
users<br><b>Subject:</b> Re: [Users] Gluster =
question<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p
=
class=3DMsoNormal><span =
style=3D'font-family:"Tahoma","sans-serif"'>There was
another recent =
post about this but a sum up
was:<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-family:"Tahoma","sans-serif"'><o:p> </o:p></span></p><=
/div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Tahoma","sans-serif"'>You must have
power fencing =
to support VM HA otherwise they'll be an issue with the engine not =
knowing whether the VM is still running and not bring it up on a new =
host to avoid data corruption. Also make sure you have your quorum setup =
properly based on your replication scenario so you can withstand 1 host =
being lost.<o:p></o:p></span></p></div><div><p
class=3DMsoNormal><span =
style=3D'font-family:"Tahoma","sans-serif"'><o:p> </o:p></span></p><=
/div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Tahoma","sans-serif"'>I don't
believe they'll =
"keep running" in a sense because of the host being lost, but =
they would restart on another host. At least that's what I've noticed in =
my case.<o:p></o:p></span></p></div><div><p
class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><o:p> </o:p></p><div><p
=
class=3DMsoNormal>On Thu, Feb 6, 2014 at 1:04 PM, Maurice James <<a =
href=3D"mailto:midnightsteel@msn.com" =
target=3D"_blank">midnightsteel(a)msn.com</a>&gt; =
wrote:<o:p></o:p></p><blockquote
style=3D'border:none;border-left:solid =
#CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><p
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I currently =
have a new setup running ovirt 3.3.3. I have a Gluster storage domain =
with roughly 2.5TB of usable space. Gluster is installed on the =
same systems as the ovirt hosts. The host break down is as =
follows<o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Ovirt =
DC:<o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>4 hosts in =
the cluster. Each host has 4 physical disks in a RAID 5. Each disk is =
500GB. With the OS installed and configured I end up with 1.2TB of =
usable space left for my data volume<o:p></o:p></p><p
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Gluster =
volume:<o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>4 bricks =
with 1.2TB of space per brick (Distribute Replicate leaves me with about =
2.5TB in the storage domain)<o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Does this =
setup give me enough fault tolerance to survive losing a host and have =
my HA vm automatically move to an available host and keep =
running??<o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p></div></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><br>______________________________________=
_________<br>Users mailing list<br><a =
href=3D"mailto:Users@ovirt.org">Users@ovirt.org</a><br><a =
href=3D"http://lists.ovirt.org/mailman/listinfo/users" =
target=3D"_blank">http://lists.ovirt.org/mailman/listinfo/us...
/o:p></p></blockquote></div><p =
class=3DMsoNormal><o:p> </o:p></p></div></div></div></body></html>
------=_NextPart_000_011F_01CF22B8.338C6700--
9:24 p.m.
I'm not sure what you mean by NFS each host, but you'll need some way to at
least ensure the data is available. Be that be replicated gluster or a
centralized SAN etc.
On Thu, Feb 6, 2014 at 1:21 PM, Maurice James <midnightsteel(a)msn.com> wrote:
Hmm. So in that case would I be able to drop the Gluster setup and
use NFS
each host and make sure power fencing is enabled? Will that still achieve
fault tolerance, or is a replicated gluster still required?
*From:* Andrew Lau [mailto:andrew@andrewklau.com]
*Sent:* Wednesday, February 05, 2014 9:17 PM
*To:* Maurice James
*Cc:* users
*Subject:* Re: [Users] Gluster question
There was another recent post about this but a sum up was:
You must have power fencing to support VM HA otherwise they'll be an issue
with the engine not knowing whether the VM is still running and not bring
it up on a new host to avoid data corruption. Also make sure you have your
quorum setup properly based on your replication scenario so you can
withstand 1 host being lost.
I don't believe they'll "keep running" in a sense because of the host
being lost, but they would restart on another host. At least that's what
I've noticed in my case.
On Thu, Feb 6, 2014 at 1:04 PM, Maurice James <midnightsteel(a)msn.com>
wrote:
I currently have a new setup running ovirt 3.3.3. I have a Gluster storage
domain with roughly 2.5TB of usable space. Gluster is installed on the
same systems as the ovirt hosts. The host break down is as follows
Ovirt DC:
4 hosts in the cluster. Each host has 4 physical disks in a RAID 5. Each
disk is 500GB. With the OS installed and configured I end up with 1.2TB of
usable space left for my data volume
Gluster volume:
4 bricks with 1.2TB of space per brick (Distribute Replicate leaves me
with about 2.5TB in the storage domain)
Does this setup give me enough fault tolerance to survive losing a host
and have my HA vm automatically move to an available host and keep running??
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
9:29 p.m.
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OK I think I got it now. What I meant by NFS on each host was. In ovirt you
can set up an NFS storage domain on each host and have the available to all
hosts in the cluster
From: Andrew Lau [mailto:andrew@andrewklau.com]
Sent: Wednesday, February 05, 2014 9:25 PM
To: Maurice James
Cc: users
Subject: Re: [Users] Gluster question
I'm not sure what you mean by NFS each host, but you'll need some way to at
least ensure the data is available. Be that be replicated gluster or a
centralized SAN etc.
On Thu, Feb 6, 2014 at 1:21 PM, Maurice James <midnightsteel(a)msn.com
<mailto:midnightsteel@msn.com> > wrote:
Hmm. So in that case would I be able to drop the Gluster setup and use NFS
each host and make sure power fencing is enabled? Will that still achieve
fault tolerance, or is a replicated gluster still required?
From: Andrew Lau [mailto:andrew@andrewklau.com
<mailto:andrew@andrewklau.com> ]
Sent: Wednesday, February 05, 2014 9:17 PM
To: Maurice James
Cc: users
Subject: Re: [Users] Gluster question
There was another recent post about this but a sum up was:
You must have power fencing to support VM HA otherwise they'll be an issue
with the engine not knowing whether the VM is still running and not bring it
up on a new host to avoid data corruption. Also make sure you have your
quorum setup properly based on your replication scenario so you can
withstand 1 host being lost.
I don't believe they'll "keep running" in a sense because of the host
being
lost, but they would restart on another host. At least that's what I've
noticed in my case.
On Thu, Feb 6, 2014 at 1:04 PM, Maurice James <midnightsteel(a)msn.com
<mailto:midnightsteel@msn.com> > wrote:
I currently have a new setup running ovirt 3.3.3. I have a Gluster storage
domain with roughly 2.5TB of usable space. Gluster is installed on the same
systems as the ovirt hosts. The host break down is as follows
Ovirt DC:
4 hosts in the cluster. Each host has 4 physical disks in a RAID 5. Each
disk is 500GB. With the OS installed and configured I end up with 1.2TB of
usable space left for my data volume
Gluster volume:
4 bricks with 1.2TB of space per brick (Distribute Replicate leaves me with
about 2.5TB in the storage domain)
Does this setup give me enough fault tolerance to survive losing a host and
have my HA vm automatically move to an available host and keep running??
_______________________________________________
Users mailing list
Users(a)ovirt.org <mailto:Users@ovirt.org>
http://lists.ovirt.org/mailman/listinfo/users
------=_NextPart_000_012D_01CF22B9.5413C670
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link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>OK I think I got it now. What I meant by NFS on each host was. In =
ovirt you can set up an NFS storage domain on each host and have the =
available to all hosts in the cluster<o:p></o:p></span></p><p
=
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p> </o:p></span></p><p
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p> </o:p></span></p><p
class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>From:</span=
</b><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>
Andrew =
Lau [mailto:andrew@andrewklau.com] <br><b>Sent:</b> Wednesday, February
=
05, 2014 9:25 PM<br><b>To:</b> Maurice
James<br><b>Cc:</b> =
users<br><b>Subject:</b> Re: [Users] Gluster =
question<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p
=
class=3DMsoNormal><span
style=3D'font-family:"Tahoma","sans-serif"'>I'm =
not sure what you mean by NFS each host, but you'll need some way to at =
least ensure the data is available. Be that be replicated gluster or a =
centralized SAN
etc.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p><div><p
class=3DMsoNormal>On Thu, =
Feb 6, 2014 at 1:21 PM, Maurice James <<a =
href=3D"mailto:midnightsteel@msn.com" =
target=3D"_blank">midnightsteel(a)msn.com</a>&gt; =
wrote:<o:p></o:p></p><blockquote
style=3D'border:none;border-left:solid =
#CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><p
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Hmm. So in that case would I be able to drop the Gluster setup and =
use NFS each host and make sure power fencing is enabled? Will that =
still achieve fault tolerance, or is a replicated gluster still =
required?</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'> </span><o:p></o:p></p><p class=3DMsoNormal
=
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
=
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>From:</span=
</b><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>
Andrew =
Lau [mailto:<a href=3D"mailto:andrew@andrewklau.com" =
target=3D"_blank">andrew(a)andrewklau.com</a>]
<br><b>Sent:</b> Wednesday, =
February 05, 2014 9:17 PM<br><b>To:</b> Maurice
James<br><b>Cc:</b> =
users<br><b>Subject:</b> Re: [Users] Gluster =
question</span><o:p></o:p></p><div><div><p
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p><div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-family:"Tahoma","sans-serif"'>There was
another recent =
post about this but a sum up
was:</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-family:"Tahoma","sans-serif"'> </span><o:p></o:p></p><=
/div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-family:"Tahoma","sans-serif"'>You must have
power fencing =
to support VM HA otherwise they'll be an issue with the engine not =
knowing whether the VM is still running and not bring it up on a new =
host to avoid data corruption. Also make sure you have your quorum setup =
properly based on your replication scenario so you can withstand 1 host =
being lost.</span><o:p></o:p></p></div><div><p
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-family:"Tahoma","sans-serif"'> </span><o:p></o:p></p><=
/div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
style=3D'font-family:"Tahoma","sans-serif"'>I don't
believe they'll =
"keep running" in a sense because of the host being lost, but =
they would restart on another host. At least that's what I've noticed in =
my case.</span><o:p></o:p></p></div><div><p
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;margin-bottom:12.0pt'> <o:p></o:p><=
/p><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>On Thu, Feb =
6, 2014 at 1:04 PM, Maurice James <<a =
href=3D"mailto:midnightsteel@msn.com" =
target=3D"_blank">midnightsteel(a)msn.com</a>&gt; =
wrote:<o:p></o:p></p><blockquote
style=3D'border:none;border-left:solid =
#CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5=
.0pt'><div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I currently =
have a new setup running ovirt 3.3.3. I have a Gluster storage domain =
with roughly 2.5TB of usable space. Gluster is installed on the =
same systems as the ovirt hosts. The host break down is as =
follows<o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Ovirt =
DC:<o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>4 hosts in =
the cluster. Each host has 4 physical disks in a RAID 5. Each disk is =
500GB. With the OS installed and configured I end up with 1.2TB of =
usable space left for my data volume<o:p></o:p></p><p
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Gluster =
volume:<o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>4 bricks =
with 1.2TB of space per brick (Distribute Replicate leaves me with about =
2.5TB in the storage domain)<o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Does this =
setup give me enough fault tolerance to survive losing a host and have =
my HA vm automatically move to an available host and keep =
running??<o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p></div></div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;margin-bottom:12.0pt'><br>______________=
_________________________________<br>Users mailing list<br><a =
href=3D"mailto:Users@ovirt.org" =
target=3D"_blank">Users(a)ovirt.org</a><br><a =
href=3D"http://lists.ovirt.org/mailman/listinfo/users" =
target=3D"_blank">http://lists.ovirt.org/mailman/listinfo/us...
/o:p></p></blockquote></div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p><=
/o:p></p></div></div></div></div></div></div></blockquote></div><p
=
class=3DMsoNormal><o:p> </o:p></p></div></div></div></body></html>
------=_NextPart_000_012D_01CF22B9.5413C670--
5:13 p.m.
On 02/06/2014 04:29 AM, Maurice James wrote:
OK I think I got it now. What I meant by NFS on each host was. In
ovirt
you can set up an NFS storage domain on each host and have the available
to all hosts in the cluster
but then you have no replication/redudnacy in case a host fails, while
with gluster with replication you don't care (well less) if a host fails?
*From:*Andrew Lau [mailto:andrew@andrewklau.com]
*Sent:* Wednesday, February 05, 2014 9:25 PM
*To:* Maurice James
*Cc:* users
*Subject:* Re: [Users] Gluster question
I'm not sure what you mean by NFS each host, but you'll need some way to
at least ensure the data is available. Be that be replicated gluster or
a centralized SAN etc.
On Thu, Feb 6, 2014 at 1:21 PM, Maurice James <midnightsteel(a)msn.com
<mailto:midnightsteel@msn.com>> wrote:
Hmm. So in that case would I be able to drop the Gluster setup and
use NFS each host and make sure power fencing is enabled? Will that
still achieve fault tolerance, or is a replicated gluster still
required?
*From:*Andrew Lau [mailto:andrew@andrewklau.com
<mailto:andrew@andrewklau.com>]
*Sent:* Wednesday, February 05, 2014 9:17 PM
*To:* Maurice James
*Cc:* users
*Subject:* Re: [Users] Gluster question
There was another recent post about this but a sum up was:
You must have power fencing to support VM HA otherwise they'll be an
issue with the engine not knowing whether the VM is still running
and not bring it up on a new host to avoid data corruption. Also
make sure you have your quorum setup properly based on your
replication scenario so you can withstand 1 host being lost.
I don't believe they'll "keep running" in a sense because of the
host being lost, but they would restart on another host. At least
that's what I've noticed in my case.
On Thu, Feb 6, 2014 at 1:04 PM, Maurice James <midnightsteel(a)msn.com
<mailto:midnightsteel@msn.com>> wrote:
I currently have a new setup running ovirt 3.3.3. I have a
Gluster storage domain with roughly 2.5TB of usable space.
Gluster is installed on the same systems as the ovirt hosts.
The host break down is as follows
Ovirt DC:
4 hosts in the cluster. Each host has 4 physical disks in a RAID
5. Each disk is 500GB. With the OS installed and configured I
end up with 1.2TB of usable space left for my data volume
Gluster volume:
4 bricks with 1.2TB of space per brick (Distribute Replicate
leaves me with about 2.5TB in the storage domain)
Does this setup give me enough fault tolerance to survive losing
a host and have my HA vm automatically move to an available host
and keep running??
_______________________________________________
Users mailing list
Users(a)ovirt.org <mailto:Users@ovirt.org>
http://lists.ovirt.org/mailman/listinfo/users
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
6:09 p.m.
Thanks
-----Original Message-----
From: Itamar Heim [mailto:iheim@redhat.com]
Sent: Sunday, February 09, 2014 5:13 PM
To: Maurice James; 'Andrew Lau'
Cc: 'users'
Subject: Re: [Users] Gluster question
On 02/06/2014 04:29 AM, Maurice James wrote:
OK I think I got it now. What I meant by NFS on each host was. In
ovirt you can set up an NFS storage domain on each host and have the
available to all hosts in the cluster
but then you have no replication/redudnacy in case a host fails, while with
gluster with replication you don't care (well less) if a host fails?
*From:*Andrew Lau [mailto:andrew@andrewklau.com]
*Sent:* Wednesday, February 05, 2014 9:25 PM
*To:* Maurice James
*Cc:* users
*Subject:* Re: [Users] Gluster question
I'm not sure what you mean by NFS each host, but you'll need some way
to at least ensure the data is available. Be that be replicated
gluster or a centralized SAN etc.
On Thu, Feb 6, 2014 at 1:21 PM, Maurice James <midnightsteel(a)msn.com
<mailto:midnightsteel@msn.com>> wrote:
Hmm. So in that case would I be able to drop the Gluster setup and
use NFS each host and make sure power fencing is enabled? Will that
still achieve fault tolerance, or is a replicated gluster still
required?
*From:*Andrew Lau [mailto:andrew@andrewklau.com
<mailto:andrew@andrewklau.com>]
*Sent:* Wednesday, February 05, 2014 9:17 PM
*To:* Maurice James
*Cc:* users
*Subject:* Re: [Users] Gluster question
There was another recent post about this but a sum up was:
You must have power fencing to support VM HA otherwise they'll be an
issue with the engine not knowing whether the VM is still running
and not bring it up on a new host to avoid data corruption. Also
make sure you have your quorum setup properly based on your
replication scenario so you can withstand 1 host being lost.
I don't believe they'll "keep running" in a sense because of the
host being lost, but they would restart on another host. At least
that's what I've noticed in my case.
On Thu, Feb 6, 2014 at 1:04 PM, Maurice James <midnightsteel(a)msn.com
<mailto:midnightsteel@msn.com>> wrote:
I currently have a new setup running ovirt 3.3.3. I have a
Gluster storage domain with roughly 2.5TB of usable space.
Gluster is installed on the same systems as the ovirt hosts.
The host break down is as follows
Ovirt DC:
4 hosts in the cluster. Each host has 4 physical disks in a RAID
5. Each disk is 500GB. With the OS installed and configured I
end up with 1.2TB of usable space left for my data volume
Gluster volume:
4 bricks with 1.2TB of space per brick (Distribute Replicate
leaves me with about 2.5TB in the storage domain)
Does this setup give me enough fault tolerance to survive losing
a host and have my HA vm automatically move to an available host
and keep running??
_______________________________________________
Users mailing list
Users(a)ovirt.org <mailto:Users@ovirt.org>
http://lists.ovirt.org/mailman/listinfo/users
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
3:49 a.m.
Hi,
I think your problem is the following:
if you put your shared storage on
the same servers where the HA-VMs run
and you lose one of those servers, you
inherently also lose the disk space on
this server.
Gluster can, in theory, circumvent this.
But afaik (read on this very ml) it is
not supported to run gluster on the same
nodes as you run the vms.
HTH
--
Mit freundlichen Grüßen / Regards
Sven Kieske
Systemadministrator
Mittwald CM Service GmbH & Co. KG
Königsberger Straße 6
32339 Espelkamp
T: +49-5772-293-100
F: +49-5772-293-333
https://www.mittwald.de
Geschäftsführer: Robert Meyer
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Komplementärin: Robert Meyer Verwaltungs GmbH, HRB 13260, AG Bad Oeynhausen
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7 comments
4 participants
participants (4)
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Andrew Lau -
Itamar Heim -
Maurice James -
Sven Kieske