You can fail-over using iSCSI multi-pathing. Have the initiator log in to both targets and then setup dm-multipath to do fail-over. On the target side you could use drbd with multi primaries and there you have it, redundant storage with easy fail-over.

-Ross


-----Original Message-----
From: centos-bounces@centos.org <centos-bounces@centos.org>
To: CentOS mailing list <centos@centos.org>
Sent: Wed Jan 02 20:15:58 2008
Subject: Re: [CentOS] Xen, GFS, GNBD and DRBD?

On 03/01/2008, at 9:55 AM, Ross S. W. Walker wrote:

>
> Take a look at iSCSI for the storage servers. iSCSI Enterprise 
> Target is what I use here and it works well for us.
>
> You don't really need shared filesystems if you are doing direct 
> block io to LVs or raw partitions as the Xen migration will handle 
> the hand-off, but you will if you are using flat files, because of 
> this I recommend using LVs or raw partitions as clustered 
> filesystems will put a serious overhead on the Xen guest io.
>
> -Ross

Ross,

I can use DRBD to mirror data between the two storage servers and 
iSCSI to export the block devices, but how will iSCSI cope with 
failure of one storage server?

Can I use heartbeat and CRM to failover the host IP and iSCSI target 
to the other storage server?

Regards,
Tom
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