[Linux-cluster] Clustered LVM for storage

[Charles Riley]

We're talking 36TB of storage here..  I've never had much success
partitioning an array of that size (and actually being able to use all of
the space) without lvm.  But I might give that a try.

Continuing along this line of thought:
If I stop access to the array from all of the servers before I make any
changes, I could probably even make use of lvm without clustering.

Charles


On Thu, Mar 8, 2012 at 5:59 PM, Jeff Sturm <jeff.sturm at eprize.com> wrote:

>  With aoe you can use old-fashioned disk partitioning.  Just run "parted"
> (or whatever partitioning tool you choose) and allocate storage for
> partitions as you see fit.****
>
> ** **
>
> The benefits of doing this are:  Easier/simpler to setup than cluster
> suite, and you can still use all the spindles from your aoe target (for
> example by creating a large RAID-10 array across all disks).****
>
> ** **
>
> The downside of partitions is they aren't easy to change.  You can add
> them safely while the storage array is in use, but each host needs to
> reload the partition table when you're done with changes before the new
> storage can be used, and that may not happen until you rmmod/modprobe the
> aoe driver, which you can't do while any partitions are in use, e.g. on
> mounted file systems.  And resizing partitions is tricky because they are
> allocated on consecutive sectors.****
>
> ** **
>
> So if you want the flexibility of adding/removing/modifying volumes at any
> time, it may be worth the trouble to get Cluster Suite running so you can
> use CLVM.  If you just want to carve it up once and forget about it,
> partitioning the array will be the fastest.****
>
> ** **
>
> -Jeff****
>
> ** **
>
> *From:* linux-cluster-bounces at redhat.com [mailto:
> linux-cluster-bounces at redhat.com] *On Behalf Of *Charles Riley
> *Sent:* Thursday, March 08, 2012 1:59 PM
> *To:* linux cluster
> *Subject:* [Linux-cluster] Clustered LVM for storage****
>
> ** **
>
> Greetings,****
>
> ** **
>
> I have an aoe device with a lot of storage in it that I would like to
> share among four rhel 4 servers.  Each of the servers will mount it's own
> storage, no data is shared between them.  e.g the servers won't be mounting
> the same volumes.****
>
> ** **
>
> I could create four different raid groups on the aoe device and present a
> different one to each server, but that would waste space.****
>
> What I'd rather do is create one big raid group and use clustered lvm to
> divvy the space between servers.****
>
> ** **
>
> Is it possible?  Would it be enough to run just the clustered lvm daemon,
> or would I need to install all of the cluster suite?****
>
> Are there other/better options?****
>
> ** **
>
> Thanks!****
>
> ** **
>
> Charles****
>
> ** **
>
>
> ****
>
> ** **
>
> ** **
>
> --
> Linux-cluster mailing list
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> https://www.redhat.com/mailman/listinfo/linux-cluster
>



-- 
Charles Riley | eRAD <http://www.erad.com> | Director of Technical Solutions |
O: 864.640.8648 C: 864.881.1331
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