[sheepdog-users] sheepdog tgt multipath

[Hitoshi Mitake]

At Tue, 21 Apr 2015 20:14:04 +0200,
Balázs Kónya wrote:
> 
> [1  <text/plain; UTF-8 (quoted-printable)>]
> Hi!
> 
> I tested your advice!
> 
> The whole concept still not working, but.
> 
> Format the cluster with -l option and tgtd helped to setup multipathing
> when only one XenServer node connected to the storage.
> I've not tested with VM, but checking XenServer path status, seems to
> working as expected.
> If i restart one sheep node with the tgtd...path goes down...after
> recovery...path recovers too.
> 
> After i created a XenServer pool with two xen node, and connect the
> storage...everything seems to be ok, but when i enable the XenServer High
> Avaliability, only one iSCSI path remain active...
> 
> I'm sure, this is not the Sheepdog Cluster or tgt problem.
> 
> Thank You for the advice again!

We found a problem of iSCSI multipath in the latest master
branch. Could you test with v0.9.1? v0.9.1 + latest tgt can work well.

Thanks,
Hitoshi

> 
> 2015-04-21 14:24 GMT+02:00 Balázs Kónya <brokerka at gmail.com>:
> 
> > 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
> >> >
> >>
> >
> >
> [2  <text/html; UTF-8 (quoted-printable)>]
>