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Ah - understood.

The iSCSI SR will of course be logged in while the SR is plugged on the host (through the PBD).

You could potentially use a hook script (create files called vm-pre-start and vm-post-destroy in /etc/xapi.d) to create the SR dynamically, but beyond that there isn't currently a way to only have the iSCSI target logged in when the VM is booted.

Bob

From: Rushikesh Jadhav [2rushikeshj@xxxxxxxxx]
Sent: 14 August 2013 22:22
To: Bob Ball
Cc: xen-api@xxxxxxxxxxxxx
Subject: Re: [Xen-API] How to use iSCSI disk with Xenserver VM

On Thu, Aug 15, 2013 at 2:31 AM, Bob Ball <bob.ball@xxxxxxxxxx> wrote:

Hi,

You can create an SR using the undocumented and unsupported "iscsi" type and set the device config target and targetIQN values - this will set up a single VDI which is a raw lun.

Thanks Bob but I'm looking for a generic way in which I would be storing the LUN info in VM properties other-config (MRW) or if possible in VBD other config such that whenever VM tries to boot, the hook will login on iSCSI target and pass the device. I think this needs be handled by blktap rather than XAPI or SMAPI, what you say ?

Attach that VDI to a guest and it should be what you're looking for?

Trying to automate it.

Thanks,

Bob

From: xen-api-bounces@xxxxxxxxxxxxx [xen-api-bounces@xxxxxxxxxxxxx] on behalf of Rushikesh Jadhav [2rushikeshj@xxxxxxxxx]
Sent: 14 August 2013 16:07
To: xen-api@xxxxxxxxxxxxx
Subject: [Xen-API] How to use iSCSI disk with Xenserver VM

Hello All,

Since normal Xen supports iSCSI lun as device for xvda, I would like to know its possibility with Xenserver.

What are the possible ways may be hacky to get it working ?

Since XAPI can now support Ceph as custom drive, how hard it would be to use same for iSCSI ?

From Xenserver POV, I undestood that Ceph is acting as a SR but I'm expecting to pass iSCSI lun as raw block device to VM.

Thanks.