Anonymous_User Absent Member.
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Two pools in one Cluster resource

For silly reasons, users with 300GB of space, want another TB of space.
Except it will be on a second physical device, so we are unwilling to
span the pool across two physical devices. We are chickens when it
comes to spanning.

So, I want to make the space in a new pool. Great, I want one cluster
resource for 2 pools.

Using C1, and cluster 1.7 snapins, if you try to enable a pool with an
IP already in use in the cluster you get an error. So I cannot pretend
it is like adding another volume in the pool.

I can edit the load script to say nss /poolactivate=POOL2 and then
mount all the volumes, and that works, and migrates and everything looks
cool, EXCEPT one very minor thing.

Backups through TSA in cluster mode!! They only show the volumes in
the first pool, not in the second mounted pool.

So am I missing something, or is this not possible? It seems like it
should work fine, but it does not.
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7 Replies
Anonymous_User Absent Member.
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Re: Two pools in one Cluster resource

Geoffrey Carman wrote:

>Great, I want one cluster resource for 2 pools.


afaik, this is not recommended - 1 pool, 1 cluster resource - or you run
into problems (as you have noticed).

--
Joe Moore
Novell Support Forums SysOp
http://just.fdisk-it.com
http://www.caledonia.net/jmdns.html
http://www.caledonia.net/nesadmin.html
http://www.caledonia.net/jmttb.html
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Anonymous_User Absent Member.
Absent Member.

Re: Two pools in one Cluster resource

Joseph Moore [SysOp] wrote:
> Geoffrey Carman wrote:
>
>> Great, I want one cluster resource for 2 pools.

>
> afaik, this is not recommended - 1 pool, 1 cluster resource - or you run
> into problems (as you have noticed).


But is there some way to make it work? 🙂 I.e. One area wants one
cluster resource, but it will be stored in two pools, no way to provide
that? (We do not want pools spanning physical devices).

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Anonymous_User Absent Member.
Absent Member.

Re: Two pools in one Cluster resource

Is there a reason you cannot create a second resource? If you have two pools, aren't you going to have two volumes? So wouldn't it be just as easy to have two resources?

>>> Geoffrey Carman<geoffreycarman@gmail.com> 6/21/2006 8:57 AM >>>

Joseph Moore [SysOp] wrote:
> Geoffrey Carman wrote:
>
>> Great, I want one cluster resource for 2 pools.

>
> afaik, this is not recommended - 1 pool, 1 cluster resource - or you run
> into problems (as you have noticed).


But is there some way to make it work? 🙂 I.e. One area wants one
cluster resource, but it will be stored in two pools, no way to provide
that? (We do not want pools spanning physical devices).
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Anonymous_User Absent Member.
Absent Member.

Re: Two pools in one Cluster resource

1 pool - 1 resource, but

1 cluster can have 2 resources and hence 2 pools. Surely there's a way to separate their requirements into two volumes?

or: looks like they've got a 1Tb pool and you've got a test resource to hold all your mp3s <g>


>>> Geoffrey Carman<geoffreycarman@gmail.com> 6/21/2006 10:57:42 AM >>>

Joseph Moore [SysOp] wrote:
> Geoffrey Carman wrote:
>
>> Great, I want one cluster resource for 2 pools.

>
> afaik, this is not recommended - 1 pool, 1 cluster resource - or you run
> into problems (as you have noticed).


But is there some way to make it work? 🙂 I.e. One area wants one
cluster resource, but it will be stored in two pools, no way to provide
that? (We do not want pools spanning physical devices).



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Anonymous_User Absent Member.
Absent Member.

Re: Two pools in one Cluster resource

Geoffrey Carman wrote:

> One area wants one cluster resource, but it will be stored in two pools, no way to provide that?


I think the problem is that the pool is the actual cluster resource - you
could probably have multiple volumes in one pool (still not recommended)
and it would work, but I don't think cluster services knows how to deal
with 2 pools in one resource.

Your best bet is going to be to give them a second pool that has a second
volume, ie a new cluster resource, as Marc suggests.

--
Joe Moore
Novell Support Forums SysOp
http://just.fdisk-it.com
http://www.caledonia.net/jmdns.html
http://www.caledonia.net/nesadmin.html
http://www.caledonia.net/jmttb.html
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Anonymous_User Absent Member.
Absent Member.

Re: Two pools in one Cluster resource

Joseph Moore [SysOp] wrote:
> Geoffrey Carman wrote:
>
>> One area wants one cluster resource, but it will be stored in two
>> pools, no way to provide that?

>
> I think the problem is that the pool is the actual cluster resource -
> you could probably have multiple volumes in one pool (still not
> recommended) and it would work, but I don't think cluster services knows
> how to deal with 2 pools in one resource.
>
> Your best bet is going to be to give them a second pool that has a
> second volume, ie a new cluster resource, as Marc suggests.


Which is interesting, since if you add the nss /poolactivate=SECONDPOOL
and mount the volumes in the load script, it can be migrated around with
the single resource. The thing that breaks is the TSAFS backup of the
file system.

So basically the answer is, the limit is one pool per resource. I had
not seen that clearly written down before... Bummer.

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Anonymous_User Absent Member.
Absent Member.

Re: Two pools in one Cluster resource

Geoffrey Carman wrote:

> So basically the answer is, the limit is one pool per resource.


unless Tim joins in and contradicts me, I would say yes 🙂

--
Joe Moore
Novell Support Forums SysOp
http://just.fdisk-it.com
http://www.caledonia.net/jmdns.html
http://www.caledonia.net/nesadmin.html
http://www.caledonia.net/jmttb.html
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