Monte vxdmp will work fine to give you multipathing and vxvm will work fine in a non-shared configuration .. there's a problem we've seen with race conditions using CVM in a shared volume management configuration with VCS or SunCluster .. additionally you've got extra overhead here as the volume management will flow back to a single node .. for SVM/ Oban/SunCluster configurations for Oracle RAC there's a little bit of extra code to deal with dmr and abr that doesn't exist in CVM
for VCS - we have scripted agents in the field for simple failover (samsharefs -s <new_server>), but these are mostly unsupported jonathan On Jun 30, 2008, at 12:29 PM, Ambrose, Monte wrote: > Mike > > Thanks for the response. The requirement is more of a local support > issue. Our UNIX admins know VxVM. Also they know and support DMP > but have no experience supporting SUN multipathing or SUN volume > management. > > Monte > > From: Michael.Selway at Sun.COM [mailto:Michael.Selway at Sun.COM] > Sent: Monday, June 30, 2008 12:14 PM > To: Ambrose, Monte > Cc: sam-qfs-discuss at opensolaris.org > Subject: Re: [sam-qfs-discuss] Using VxVM with SAMFS > > Hi Monte, > VxVM adds complexity when perhaps not needed. SAM-FS > comes with its own volume manager, albeit rudimentary, that links > volumes together into a file system. This is effectively RAID-0. > You can't use the VxVM to grow or shrink a SAMFS file system, and > unless you need software RAIDing on your disks (vs. hardware/ > controller RAID), I can't see any reason/value to adding VxVM to a > stack. The performance issues can crop up when the blocking and > otherwise addressing of VxVM volumes varies from the actual disk > topography and the blocking factors used/setup with the file system > itself (DAU). > There are folks that are using VxVM and have been doing > so for years. But again, their need should be something beyond > volume linking. > As for VCS, that is not approved to work against SAM-QFS > systems (as in fail-over agent support). > > cheers! > Mike > > On Jun 30, 2008, at 2:14 PM, Ambrose, Monte wrote: > > > Anyone have some pros/cons for using Veritas VxVM with SAMFS? I > have been told that this can cause performance issues? Anyone using > it? Any problems with DMP? Anyone use Veritas Cluster Server with > it? > > Thanks, Monte > _______________________________________________ > sam-qfs-discuss mailing list > sam-qfs-discuss at opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/sam-qfs-discuss > > Mike Selway > Sr. Consulting Engineer > > 301-332-4116 > Storage Solutions Team > Sun Microsystems > > > > _______________________________________________ > sam-qfs-discuss mailing list > sam-qfs-discuss at opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/sam-qfs-discuss
