On Wed, 3 Jan 2007, Darren Dunham wrote:
We have some HDS storage that isn't supported by mpxio, so we have to
use veritas dmp to get multipathing.
Whats the recommended way to use DMP storage with ZFS. I want to use
DMP but get at the multipathed virtual luns at as low a level as
possible to avoid using vxvm as much as possible.
I think that means creating a VxVM volume, and then passing that volume
to zpool. DMP doesn't hand you a "device" that you can use.
It does - but you cannot use it. The /dev/vx/dmp/ devices aren't working
properly, synchronization isn't done within DMP but within VxVM. There's a
Veritas advisory and a SunAlert about _not_ putting filesystems directly
onto vxdmp devices because that causes data corruption on the buf(9S)
linkage fields and subsequent crashes/hangs. If you have access to
sunsolve.sun.com, see SunAlert 55980, or bug 4789779.
I figure theres no point in having overhead from 2 volume manages if
we can avoid it.
Sure. I don't see an alternative for using DMP. Given other reports of
using ZFS on top of SVM metadevices, I wouldn't expect peformance to
drop significantly.
As said, should work, a plain vxvm volume on top of the vxdmp node, then
give that vxvm volume to ZFS.
FrankH.
Good luck.
--
Darren Dunham [EMAIL PROTECTED]
Senior Technical Consultant TAOS http://www.taos.com/
Got some Dr Pepper? San Francisco, CA bay area
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