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Re: [Xen-users] XCP and Openfiler as the storage

To: cluster@xxxxxxxx
Subject: Re: [Xen-users] XCP and Openfiler as the storage
From: Outback Dingo <outbackdingo@xxxxxxxxx>
Date: Tue, 5 Apr 2011 13:08:54 -0400
Cc: xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>, Eduardo Bragatto <eduardo@xxxxxxxxxxxx>
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On Tue, Apr 5, 2011 at 12:24 PM, <cluster@xxxxxxxx> wrote:
Hi Eduardo,

I am using this scenario (openfiler + XCP) from more than 1 year. I have had
no performance loss but my openfiler is patched for using fibrechannel.

I suggest you to create only a big LUN (less than 2TB remember) and let XCP
manage it.

Why only 2GB ??

Best regards,

-----Messaggio originale-----
Da: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] Per conto di Eduardo Bragatto
Inviato: sabato 2 aprile 2011 16:46
A: xen-users
Oggetto: [Xen-users] XCP and Openfiler as the storage


I have been using Xen under CentOS and Openfiler as the storage for a while
now, however with the release of RHEL6 without support for Xen and with the
release of XCP 1.0, I have the impression it's time to move away from CentOS
and give XCP a try.

My greatest doubt is about LVM. Openfiler handles an entire RAID10 volume
which is exported as smaller volumes created through LVM via iSCSI. However,
XCP also uses LVM to manage snapshots and such.

I believe if I start using XCP with my current storage server (Openfiler), I
will end up with two layers of LVM -- first a volume on Openfiler which is
exported via iSCSI, and then a new LVM layer created on top of the LUN I
will import via iSCSI on XCP.

How bad (performance-wise) would be to have two layers of LVM? Would it be
too complicated to maintain? (I imagine it would be as simple as dealing
with the same thing twice, but there's also XCP handling LVM, so I'm not
sure how that would work out).

Does anyone here has similar experiences they can share?

I know Openfiler does not have an API for integration with other appliances,
so I believe XCP would not be able to create and manipulate the LVM directly
on the Openfiler storage in order to avoid the two layers on top of each
other. Does anyone if that kind of integration is doable, or even possible?

Best regards,
Eduardo Bragatto

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