sorry my first message was a bit vague. We have 2 HP EVA arrays : one being the backup device of the other in case a crash occurs. So we make each node of the cluster (active/passive , multipath + clvmd + cmirror) connected to both EVAs. We create one disk on each EVAs with same characteristics, plus one disk on one of the 2 EVAs as a log mirror disk. Then we 'lvcreate -m1 disk1 disk2 disk3' and put our file system resource on this lv. That is where our test (shutdown of an EVA) totally fails. Unfortunately ha-lvm won't be usable because we intend to use GFS soon. What we need is a solution that ensures clusterized services to carry on working even if on EVA burns... Thanks a lot for helping.
C On Fri, Apr 25, 2008 at 4:26 PM, Jonathan Brassow <[EMAIL PROTECTED]> wrote: > I'm not sure what you mean by multi-SAN. Do you mean that you have two > independent storage networks connecting the same machines to the same disks, > or same machines to different disks, or something else? It sounds like you > have 1 SAN with two storage devices? It also sounds like your top level > services are active/passive, but that your storage is setup active/active. > You may consider HA-LVM instead of CLVM in this case ( > http://sourceware.org/cluster/wiki/LVMFailover). > > I've seen this scenario where things get frozen... Turns out that the user > did not have multipathd running, so multipath was queueing all I/O until a > path would come back - effectively freezing everything. > > The problem could be a number of things... we may need more information if > the above doesn't help. > > brassow > > > On Apr 25, 2008, at 7:41 AM, gnia gnia wrote: > > Hi all, >> >> Situation : 2 nodes cluster (active/active) under RedHat 4. >> Each clusterized service has a multipathed/mirrored LV (one PV on each >> storage bay -> HP EVA 8000) declared as an FS resource. >> (We decided to implement a multi-SAN environment to prevent from one SAN >> failure) >> But all clusterized mirrored LVs get frozen and become unusable when we >> simulate one SAN outage. >> >> According to you experts, what is the best way to implement a storage >> redundant redhat cluster that wouldn't fail in case of one SAN outage ? >> Is lvm mirroring a godd choice? >> >> Cheers, >> Chris -- >> Linux-cluster mailing list >> [email protected] >> https://www.redhat.com/mailman/listinfo/linux-cluster >> > > -- > Linux-cluster mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/linux-cluster >
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