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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: Christopher J Petrolino <cpetrolino@xxxxxxxxx>
Date: Tue, 5 Apr 2011 12:55:11 -0400
Cc: xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>, Eduardo Bragatto <eduardo@xxxxxxxxxxxx>
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That is helpful info, I am going to be doing some testing with
Openfiler and XCP soon, I will let you know my results as well.

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.
> Best regards,
> FG
> -----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
> Hi,
> 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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