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

[Steven Haigh <netwiz@xxxxxxxxx>]

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:
> > >>Overview
> > >>
> > >>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            =
> > >>['script=block-iscsi,vdev=xvda,target=iqn=iqn.1986-03.com.sun:02:mytarget,portal=iscsi.example.com,locktarget=y']
> You seem to suggest an extension (locktarget) to disk spec as well but
> you patch doesn't contain modification to
> docs/txt/misc/xl-disk-configuration.txt.
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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