Re: [Xen-users] XCP Storage

[Scott Damron <sdamron@xxxxxxxxx>]

My opinion on FreeNAS - Using ZFS was the only reason I _started_ to
use it, but it wouldn't work with iSCSI.  That may have changed in the
latest release, but in the first release of the 8.x version, it was
broken.

On Wed, Oct 26, 2011 at 3:13 PM, Brett Westover <bwestover@xxxxxxxxxxx> wrote:
>>Also, it seems I am reading that you can enable live migration on an XCP pool 
>>without an external storage device at all, using >local storage in each host. 
>>Is that right?
>>How does that work?
>
>
>>My understand of shared storage is that one copy of the VM exists in a place 
>>accessible to the two hosts, so to do live migration >the VM storage doesn't 
>>actually move.
>
>>Can someone point me to some documentation that explains how XenServer and 
>>XCP handle storage? It seems to be quite different than >VMware.
>
>>Thanks,
>
>>Brett Westover
>
>>I don't think it's that different. If you want to do migration your storage 
>>needs to be remote. Currently XCP seems to support two >types of remote 
>>storage that can support migration - NFS and iSCSI software target.
>
>>Grant McWilliams
>
> Well, then that clears that up... unless someone comes along and disagrees :)
>
> I thought I heard somewhere you could use DRBD storage on two servers, and 
> use that for your VMs. Since the volumes exist on both servers, you could do 
> migration. But I think that was with a customized server running Xen (not 
> XCP).
>
> So, since you previously said that with XenServer you've measured 
> significantly better performance (especially on writes) with iSCSI over NFS, 
> then it seems what I’m looking for is an iSCSI SAN (which is what I have 
> now). I'm using DataCore SanMelody, and we like it just fine, but to add a 
> second server and mirroring is VERY expensive (5 figures just for the 
> licensing).
>
> Since we're looking at converting as much of this to open source products as 
> possible, are we looking for OpenFiler? FreeNas?
> I think you mentioned building a Centos server w/ storage, and then 
> presenting that with built in iSCSI support.
>
> Looking for advantages/disadvantages.... We are not against buying an 
> enterprise product like NexentaStor if necessary to get the features we need, 
> we just can't justify anything like what we'd pay now for those (things like 
> Active/Active mirroring as a primary example), from DataCore.
>
> Thanks,
> Brett
>
>
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