9:01 p.m.
Hi,
Before trying out, I want to understand how glusterfs will react for below
scenario.
Please help me.
Let consider I have two host hostA and hostB
I have setup replica volume on hostA and hostB. (consider as storage domain
for DATA in ovirt).
I have configure data domain mount command with backup server option
(backup-volfile-server) as hostB (I mean main server as hostA and backup as
hostB)
1> As I understood, VDSM execute mount command on both hostA and hostB.(for
creating data domain)
2> That mean, HostB glusterFS CLIENT will communicate with main server
(hostA).
(Please correct me if I am wrong here.)
3> Let say HostA got down (say shutdown, power off scenario)
4> Due to backup option I will have data domain available on HostB.
(Now glusterFS CLIENT on HostB will start communicating with HostB
GlusterFS SERVER).
5> Now let say HostA comes up.
6> Will it sync all data from HostB to HostA glusterFS server ?
(as per doc, yes, i not tried yet, want to confirm my understanding)
7> Will glusterFS CLIENT on HostB start communicate with main server
(HostA) ?
Please let me know, I am new to glusterFS.
Thanks,
~Rohit
7:13 a.m.
This is a multi-part message in MIME format.
--------------25BEF73FCFC718354F3D7D9F
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Content-Transfer-Encoding: 7bit
Hi,
backup-volfile-servers is mainly used to avoid SPOF. For example
take a scenario where you have Host A and Host B and when you try to
mount a glusterfs volume using Host A with backup-volfile-servers
specified, if Host A is not accessible, mount will happen with Host B
which is specified in backup-volfile-server. backup-volfile-servers are
mainly used to fetch the volfile from gluster and has nothing to do
with data sync.
data syncing comes as part of replicate feature in glusterfs where
say for example, you have two Hosts Host A and Host B with replica
volume configured, if Host A goes down for sometime, all the writes
happens on Host B and when Host A comes up data gets synced to HostA.
Hope this helps !!!!
Thanks
kasturi
On 05/17/2017 11:31 PM, TranceWorldLogic . wrote:
Hi,
Before trying out, I want to understand how glusterfs will react for
below scenario.
Please help me.
Let consider I have two host hostA and hostB
I have setup replica volume on hostA and hostB. (consider as storage
domain for DATA in ovirt).
I have configure data domain mount command with backup server option
(backup-volfile-server) as hostB (I mean main server as hostA and
backup as hostB)
1> As I understood, VDSM execute mount command on both hostA and
hostB.(for creating data domain)
2> That mean, HostB glusterFS CLIENT will communicate with main server
(hostA).
(Please correct me if I am wrong here.)
3> Let say HostA got down (say shutdown, power off scenario)
4> Due to backup option I will have data domain available on HostB.
(Now glusterFS CLIENT on HostB will start communicating with HostB
GlusterFS SERVER).
5> Now let say HostA comes up.
6> Will it sync all data from HostB to HostA glusterFS server ?
(as per doc, yes, i not tried yet, want to confirm my understanding)
7> Will glusterFS CLIENT on HostB start communicate with main server
(HostA) ?
Please let me know, I am new to glusterFS.
Thanks,
~Rohit
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
--------------25BEF73FCFC718354F3D7D9F
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<div class="moz-cite-prefix">Hi,<br>
<br>
backup-volfile-servers is mainly used to avoid SPOF. For
example take a scenario where you have Host A and Host B and when
you try to mount a glusterfs volume using Host A with
backup-volfile-servers specified, if Host A is not accessible,
mount will happen with Host B which is specified in
backup-volfile-server. backup-volfile-servers are mainly used to
fetch the volfile from gluster and has nothing to do with data
sync. <br>
<br>
data syncing comes as part of replicate feature in glusterfs
where say for example, you have two Hosts Host A and Host B with
replica volume configured, if Host A goes down for sometime, all
the writes happens on Host B and when Host A comes up data gets
synced to HostA. <br>
<br>
Hope this helps !!!!<br>
<br>
Thanks<br>
kasturi<br>
<br>
On 05/17/2017 11:31 PM, TranceWorldLogic . wrote:<br>
</div>
<blockquote
cite="mid:CAOtQfMQjx+FZmcno4AzWHMXY7eMRh54HXtRnOwLpVRyY+JxQcg@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>
<div>
<div>
<div>Hi,<br>
<br>
</div>
Before trying out, I want to understand how glusterfs will
react for below scenario.<br>
</div>
<div>Please help me.<br>
</div>
<div><br>
</div>
Let consider I have two host hostA and hostB<br>
</div>
I have setup replica volume on hostA and hostB. (consider as
storage domain for DATA in ovirt).<br>
</div>
I have configure data domain mount command with backup server
option (backup-volfile-server) as hostB (I mean main server as
hostA and backup as hostB)<br>
<div><br>
</div>
<div>1> As I understood, VDSM execute mount command on both
hostA and hostB.(for creating data domain)<br>
</div>
<div>2> That mean, HostB glusterFS CLIENT will communicate
with main server (hostA).<br>
</div>
<div>(Please correct me if I am wrong here.)<br>
</div>
<div>3> Let say HostA got down (say shutdown, power off
scenario)<br>
</div>
<div>4> Due to backup option I will have data domain
available on HostB.<br>
</div>
<div>(Now glusterFS CLIENT on HostB will start communicating
with HostB GlusterFS SERVER).<br>
</div>
<div>5> Now let say HostA comes up.<br>
</div>
<div>6> Will it sync all data from HostB to HostA glusterFS
server ?<br>
</div>
<div>(as per doc, yes, i not tried yet, want to confirm my
understanding)<br>
</div>
<div>7> Will glusterFS CLIENT on HostB start communicate with
main server (HostA) ?<br>
<br>
</div>
<div>Please let me know, I am new to glusterFS.<br>
<br>
</div>
<div>Thanks,<br>
</div>
<div>~Rohit<br>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Users mailing list
<a class="moz-txt-link-abbreviated"
href="mailto:Users@ovirt.org">Users@ovirt.org</a>
<a class="moz-txt-link-freetext"
href="http://lists.ovirt.org/mailman/listinfo/users">http://...
</pre>
</blockquote>
<p><br>
</p>
</body>
</html>
--------------25BEF73FCFC718354F3D7D9F--
8:05 a.m.
Thanks,
Would you also explain about my 2nd question ?
let say hostB mounted glusterFS partition by using backup vol (e.g. hostB)
and after some time Host A come online, will GlusterFS client (mount)
automatically switch to Host A ?
Thanks,
~Rohit
On Thu, May 18, 2017 at 9:43 AM, knarra <knarra(a)redhat.com> wrote:
Hi,
backup-volfile-servers is mainly used to avoid SPOF. For example take
a scenario where you have Host A and Host B and when you try to mount a
glusterfs volume using Host A with backup-volfile-servers specified, if
Host A is not accessible, mount will happen with Host B which is specified
in backup-volfile-server. backup-volfile-servers are mainly used to fetch
the volfile from gluster and has nothing to do with data sync.
data syncing comes as part of replicate feature in glusterfs where say
for example, you have two Hosts Host A and Host B with replica volume
configured, if Host A goes down for sometime, all the writes happens on
Host B and when Host A comes up data gets synced to HostA.
Hope this helps !!!!
Thanks
kasturi
On 05/17/2017 11:31 PM, TranceWorldLogic . wrote:
Hi,
Before trying out, I want to understand how glusterfs will react for below
scenario.
Please help me.
Let consider I have two host hostA and hostB
I have setup replica volume on hostA and hostB. (consider as storage
domain for DATA in ovirt).
I have configure data domain mount command with backup server option
(backup-volfile-server) as hostB (I mean main server as hostA and backup as
hostB)
1> As I understood, VDSM execute mount command on both hostA and
hostB.(for creating data domain)
2> That mean, HostB glusterFS CLIENT will communicate with main server
(hostA).
(Please correct me if I am wrong here.)
3> Let say HostA got down (say shutdown, power off scenario)
4> Due to backup option I will have data domain available on HostB.
(Now glusterFS CLIENT on HostB will start communicating with HostB
GlusterFS SERVER).
5> Now let say HostA comes up.
6> Will it sync all data from HostB to HostA glusterFS server ?
(as per doc, yes, i not tried yet, want to confirm my understanding)
7> Will glusterFS CLIENT on HostB start communicate with main server
(HostA) ?
Please let me know, I am new to glusterFS.
Thanks,
~Rohit
_______________________________________________
Users mailing listUsers@ovirt.orghttp://lists.ovirt.org/mailman/listinfo/users
9:24 a.m.
This is a multi-part message in MIME format.
--------------90D6E286749B0AE50464327D
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Content-Transfer-Encoding: 7bit
On 05/18/2017 10:35 AM, TranceWorldLogic . wrote:
Thanks,
Would you also explain about my 2nd question ?
let say hostB mounted glusterFS partition by using backup vol (e.g.
hostB) and after some time Host A come online, will GlusterFS client
(mount) automatically switch to Host A ?
mount will not switch automatically to
Host A .
In an ideal case i.e with out using backup-vol-file-server option if
host B goes down, you mount will not be accessible since host B went
down and df -TH or mount does not show the volume or it says "Transport
End point not connected".
Take the case where using backup-volfile-server option. If host B goes
down, your mount will still be accessible since there is
backup-volfile-server and df -TH or mount still shows that volume is
mounted using Host B, but all the internal requests will be served
through Host A.
On Thu, May 18, 2017 at 9:43 AM, knarra <knarra(a)redhat.com
<mailto:knarra@redhat.com>> wrote:
Hi,
backup-volfile-servers is mainly used to avoid SPOF. For
example take a scenario where you have Host A and Host B and when
you try to mount a glusterfs volume using Host A with
backup-volfile-servers specified, if Host A is not accessible,
mount will happen with Host B which is specified in
backup-volfile-server. backup-volfile-servers are mainly used to
fetch the volfile from gluster and has nothing to do with data sync.
data syncing comes as part of replicate feature in glusterfs
where say for example, you have two Hosts Host A and Host B with
replica volume configured, if Host A goes down for sometime, all
the writes happens on Host B and when Host A comes up data gets
synced to HostA.
Hope this helps !!!!
Thanks
kasturi
On 05/17/2017 11:31 PM, TranceWorldLogic . wrote:
> Hi,
>
> Before trying out, I want to understand how glusterfs will react
> for below scenario.
> Please help me.
>
> Let consider I have two host hostA and hostB
> I have setup replica volume on hostA and hostB. (consider as
> storage domain for DATA in ovirt).
> I have configure data domain mount command with backup server
> option (backup-volfile-server) as hostB (I mean main server as
> hostA and backup as hostB)
>
> 1> As I understood, VDSM execute mount command on both hostA and
> hostB.(for creating data domain)
> 2> That mean, HostB glusterFS CLIENT will communicate with main
> server (hostA).
> (Please correct me if I am wrong here.)
> 3> Let say HostA got down (say shutdown, power off scenario)
> 4> Due to backup option I will have data domain available on HostB.
> (Now glusterFS CLIENT on HostB will start communicating with
> HostB GlusterFS SERVER).
> 5> Now let say HostA comes up.
> 6> Will it sync all data from HostB to HostA glusterFS server ?
> (as per doc, yes, i not tried yet, want to confirm my understanding)
> 7> Will glusterFS CLIENT on HostB start communicate with main
> server (HostA) ?
>
> Please let me know, I am new to glusterFS.
>
> Thanks,
> ~Rohit
>
>
> _______________________________________________
> 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>
--------------90D6E286749B0AE50464327D
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<head>
<meta content="text/html; charset=utf-8"
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</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">On 05/18/2017 10:35 AM,
TranceWorldLogic . wrote:<br>
</div>
<blockquote
cite="mid:CAOtQfMT_heSqRH-cgDP2W58_oVToD4XP6w35Tjm0_8zH8wNV1Q@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>
<div>
<div>
<div>Thanks,<br>
</div>
Would you also explain about my 2nd question ?<br>
<br>
</div>
let say hostB mounted glusterFS partition by using backup
vol (e.g. hostB) and after some time Host A come online,
will GlusterFS client (mount) automatically switch to Host A
?<br>
</div>
</div>
</div>
</blockquote>
mount will not switch automatically to Host A .<br>
<br>
In an ideal case i.e with out using backup-vol-file-server option if
host B goes down, you mount will not be accessible since host B went
down and df -TH or mount does not show the volume or it says
"Transport End point not connected".<br>
<br>
Take the case where using backup-volfile-server option. If host B
goes down, your mount will still be accessible since there is
backup-volfile-server and df -TH or mount still shows that volume is
mounted using Host B, but all the internal requests will be served
through Host A.<br>
<br>
<blockquote
cite="mid:CAOtQfMT_heSqRH-cgDP2W58_oVToD4XP6w35Tjm0_8zH8wNV1Q@mail.gmail.com"
type="cite">
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, May 18, 2017 at 9:43 AM, knarra
<span dir="ltr"><<a moz-do-not-send="true"
href="mailto:knarra@redhat.com"
target="_blank">knarra(a)redhat.com</a>&gt;</span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div
class="m_-7509900777764793872moz-cite-prefix">Hi,<br>
<br>
backup-volfile-servers is mainly used to avoid SPOF.
For example take a scenario where you have Host A and
Host B and when you try to mount a glusterfs volume
using Host A with backup-volfile-servers specified, if
Host A is not accessible, mount will happen with Host B
which is specified in backup-volfile-server.
backup-volfile-servers are mainly used to fetch the
volfile from gluster and has nothing to do with data
sync. <br>
<br>
data syncing comes as part of replicate feature in
glusterfs where say for example, you have two Hosts Host
A and Host B with replica volume configured, if Host A
goes down for sometime, all the writes happens on Host B
and when Host A comes up data gets synced to HostA. <br>
<br>
Hope this helps !!!!<br>
<br>
Thanks<br>
kasturi
<div>
<div class="h5"><br>
<br>
On 05/17/2017 11:31 PM, TranceWorldLogic . wrote:<br>
</div>
</div>
</div>
<blockquote type="cite">
<div>
<div class="h5">
<div dir="ltr">
<div>
<div>
<div>
<div>Hi,<br>
<br>
</div>
Before trying out, I want to understand how
glusterfs will react for below scenario.<br>
</div>
<div>Please help me.<br>
</div>
<div><br>
</div>
Let consider I have two host hostA and hostB<br>
</div>
I have setup replica volume on hostA and hostB.
(consider as storage domain for DATA in ovirt).<br>
</div>
I have configure data domain mount command with
backup server option (backup-volfile-server) as
hostB (I mean main server as hostA and backup as
hostB)<br>
<div><br>
</div>
<div>1> As I understood, VDSM execute mount
command on both hostA and hostB.(for creating
data domain)<br>
</div>
<div>2> That mean, HostB glusterFS CLIENT will
communicate with main server (hostA).<br>
</div>
<div>(Please correct me if I am wrong here.)<br>
</div>
<div>3> Let say HostA got down (say shutdown,
power off scenario)<br>
</div>
<div>4> Due to backup option I will have data
domain available on HostB.<br>
</div>
<div>(Now glusterFS CLIENT on HostB will start
communicating with HostB GlusterFS SERVER).<br>
</div>
<div>5> Now let say HostA comes up.<br>
</div>
<div>6> Will it sync all data from HostB to
HostA glusterFS server ?<br>
</div>
<div>(as per doc, yes, i not tried yet, want to
confirm my understanding)<br>
</div>
<div>7> Will glusterFS CLIENT on HostB start
communicate with main server (HostA) ?<br>
<br>
</div>
<div>Please let me know, I am new to glusterFS.<br>
<br>
</div>
<div>Thanks,<br>
</div>
<div>~Rohit<br>
</div>
</div>
<br>
<fieldset
class="m_-7509900777764793872mimeAttachmentHeader"></fieldset>
<br>
</div>
</div>
<pre>______________________________<wbr>_________________
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class="m_-7509900777764793872moz-txt-link-abbreviated"
href="mailto:Users@ovirt.org"
target="_blank">Users(a)ovirt.org</a>
<a moz-do-not-send="true"
class="m_-7509900777764793872moz-txt-link-freetext"
href="http://lists.ovirt.org/mailman/listinfo/users"
target="_blank">http://lists.ovirt.org/<wbr>mailman/li...
</pre>
</blockquote>
<p>
</p>
</div>
</blockquote></div>
</div>
</blockquote><p>
</p></body></html>
--------------90D6E286749B0AE50464327D--
12:54 p.m.
Hi,
Can you point me to some document that help me to understand how gluster
client work ?
Related to ovirt will be helpful.
Thanks,
~Rohit
On Thu, May 18, 2017 at 11:54 AM, knarra <knarra(a)redhat.com> wrote:
On 05/18/2017 10:35 AM, TranceWorldLogic . wrote:
Thanks,
Would you also explain about my 2nd question ?
let say hostB mounted glusterFS partition by using backup vol (e.g. hostB)
and after some time Host A come online, will GlusterFS client (mount)
automatically switch to Host A ?
mount will not switch automatically to Host A .
In an ideal case i.e with out using backup-vol-file-server option if host
B goes down, you mount will not be accessible since host B went down and df
-TH or mount does not show the volume or it says "Transport End point not
connected".
Take the case where using backup-volfile-server option. If host B goes
down, your mount will still be accessible since there is
backup-volfile-server and df -TH or mount still shows that volume is
mounted using Host B, but all the internal requests will be served through
Host A.
On Thu, May 18, 2017 at 9:43 AM, knarra <knarra(a)redhat.com> wrote:
> Hi,
>
> backup-volfile-servers is mainly used to avoid SPOF. For example take
> a scenario where you have Host A and Host B and when you try to mount a
> glusterfs volume using Host A with backup-volfile-servers specified, if
> Host A is not accessible, mount will happen with Host B which is specified
> in backup-volfile-server. backup-volfile-servers are mainly used to fetch
> the volfile from gluster and has nothing to do with data sync.
>
> data syncing comes as part of replicate feature in glusterfs where
> say for example, you have two Hosts Host A and Host B with replica volume
> configured, if Host A goes down for sometime, all the writes happens on
> Host B and when Host A comes up data gets synced to HostA.
>
> Hope this helps !!!!
>
> Thanks
> kasturi
>
>
> On 05/17/2017 11:31 PM, TranceWorldLogic . wrote:
>
> Hi,
>
> Before trying out, I want to understand how glusterfs will react for
> below scenario.
> Please help me.
>
> Let consider I have two host hostA and hostB
> I have setup replica volume on hostA and hostB. (consider as storage
> domain for DATA in ovirt).
> I have configure data domain mount command with backup server option
> (backup-volfile-server) as hostB (I mean main server as hostA and backup as
> hostB)
>
> 1> As I understood, VDSM execute mount command on both hostA and
> hostB.(for creating data domain)
> 2> That mean, HostB glusterFS CLIENT will communicate with main server
> (hostA).
> (Please correct me if I am wrong here.)
> 3> Let say HostA got down (say shutdown, power off scenario)
> 4> Due to backup option I will have data domain available on HostB.
> (Now glusterFS CLIENT on HostB will start communicating with HostB
> GlusterFS SERVER).
> 5> Now let say HostA comes up.
> 6> Will it sync all data from HostB to HostA glusterFS server ?
> (as per doc, yes, i not tried yet, want to confirm my understanding)
> 7> Will glusterFS CLIENT on HostB start communicate with main server
> (HostA) ?
>
> Please let me know, I am new to glusterFS.
>
> Thanks,
> ~Rohit
>
>
> _______________________________________________
> Users mailing listUsers@ovirt.orghttp://lists.ovirt.org/mailman/listinfo/users
>
>
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TranceWorldLogic .