[sheepdog-users] sheepdog tgt multipath

[Balázs Kónya]

Hi!

Thank You for the fast response!

Yes, i will try it, and report the results!

On XenServer (Citrix 6.5) i found a good pdf to setup multipath support, so
that will (maybe) be ok.

2015-04-21 14:13 GMT+02:00 Hitoshi Mitake <mitake.hitoshi at gmail.com>:

> On Tue, Apr 21, 2015 at 8:00 PM, Balázs Kónya <brokerka at gmail.com> wrote:
> > Hello!
> >
> > First of all, sorry for my english! I'm wokring on it :)
> >
> > I want to set up sheepdog with tgt and multipath support.
> > I'm a newbie.
> >
> > On Debian Wheezy, build 3 nodes of sheepdog, the latest from git, and tgt
> > too.
> >
> > Everything working great, but i dont find any usabe "how-to" to setting
> up
> > the multipath.
> > I want to connect the sheeep cluster to XenServer with iSCSI
> >
> > XenServer discover the single iSCSI path and LUN, and use it correctly.
> > But if one of my sheepdog node going to sleep with the fishies...after
> > recovery....
> > The corrupted node going online, recovery is success, and iSCSI resource
> > starting on an other node...sheepdog, and iSCSI HA seeming correct
> (thanks
> > to pacemaker, corosnyc)...but..
> >
> > Every time my VM's virtual disk become corrupted, but not the VDI inside
> > sheepdog cluster..
> > dog vdi check finishing successfully....
> >
> > The mailfuncion become inside the virtual machine...
> >
> > i found this article:
> > https://www.mail-archive.com/sheepdog@lists.wpkg.org/msg13589.html
> >
> > This article descibes the same problem that i have!
> >
> > Based on this article, my sheepdog, and tgt is the latest...so multipath
> > supporting is possibly ok..
> >
> > But how can i setup it, to work properly?
>
> Hi Balázs,
>
> At first, you need to format your cluster with "dog cluster -l" on the
> latest master. It is not documented, sorry!
>
> And the iSCSI feature of sheepdog doesn't depend on pacemaker (and the
> combination might not work).
> You just need to prepare two tgtd on two hosts, login with iSCSI
> initiator with it, and use them in fail over policy.
>
> In a case of multipathd of linux, you need to configure it with a
> configuration file like below:
> multipaths {
>         multipath {
>                 wwid                    $SCSI_ID
>                 alias                   sheepdog-iscsi
>                 path_grouping_policy    failover
>                 path_checker            readsector0
>                 path_selector           "round-robin 0"
>                 failback                manual
>                 rr_weight               priorities
>                 no_path_retry           5
>         }
> }
>
> # you need to specify scsi id to the $SCSI_ID
>
> I don't know how to setup iSCSI multipath on XenServer, so I cannot
> say anything about it :(
>
> Could you try the above procedure?
>
> Thanks,
> Hitoshi
>
> >
> > --
> > sheepdog-users mailing lists
> > sheepdog-users at lists.wpkg.org
> > https://lists.wpkg.org/mailman/listinfo/sheepdog-users
> >
>
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