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Re: [Xen-devel] [PATCH] v3 - Add exclusive locking option to block-iscsi

On 2016-05-12 21:02, Wei Liu wrote:
Hi Steven

On Mon, May 09, 2016 at 02:22:48PM +1000, Steven Haigh wrote:
On 2016-05-05 15:52, Steven Haigh wrote:
>On 2016-05-05 12:32, Steven Haigh wrote:
>>If you're using iSCSI, you can mount a target by multiple Dom0
>>machines on the same target. For non-cluster aware filesystems, this
>>can lead to disk corruption and general bad times by all. The iSCSI
>>protocol allows the use of persistent reservations as per the SCSI
>>disk spec. Low level SCSI commands for locking are handled by the
>>sg_persist program (bundled with sg3_utils package in EL).
>>The aim of this patch is to create a 'locktarget=y' option specified
>>within the disk 'target' command for iSCSI to lock the target in
>>exclusive mode on VM start with a key generated from the local systems
>>IP, and release this lock on the shutdown of the DomU.
>>Example Config:
>>disk            =

You seem to suggest an extension (locktarget) to disk spec as well but
you patch doesn't contain modification to

Correct. There is no documentation for the existing block-iscsi script within xl-disk-configuration.txt.

In fact, there is no mention at all regarding block-iscsi in any of the documentation that I can see.

Steven Haigh

Email: netwiz@xxxxxxxxx
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897

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