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Using ZFS with Veritas Cluster Server

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Operating Systems Solaris Using ZFS with Veritas Cluster Server
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Wrench Using ZFS with Veritas Cluster Server

Until I really began to explore the practical implications of using ZFS with VCS, I would not have necessarily realised the obstacles that would be put in my path. Data integrity is a must-have for storage in a shared host environment, so it surprised me to learn as I opened this particular Pandora's box that VCS provides no solution at all for ensuring data integrity on any of the ZFS pools that are a part of your cluster. The 'Zpool' agent is dumb. It imports the pool. It exports the pool. "What about SCSI-3 persistent reservations?", I hear you ask. What about them, indeed. ZFS is a competing product, I won't expect an answer to that problem coming from the Symantec camp. So I took up the gauntlet on a mission to add SCSI-3 PR support to the Zpool agent for my client. I succeeded. So I have written up some notes that might help direct others should they stumble across the same obstacles, and along the way I've discovered the benefits that Solaris MPxIO has to offer that are superior to VxDMP.

Technical Prose: SCSI-3 PR with ZFS on Veritas Cluster Server

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zdb(8)							  System Administration Commands						    zdb(8)

zdb - ZFS debugger SYNOPSIS
The zdb command is used by support engineers to diagnose failures and gather statistics. Since the ZFS file system is always consistent on disk and is self-repairing, zdb should only be run under the direction by a support engineer. If no arguments are specified, zdb, performs basic consistency checks on the pool and associated datasets, and report any problems detected. Any options supported by this command are internal to Sun and subject to change at any time. EXIT STATUS
The following exit values are returned: 0 The pool is consistent. 1 An error was detected. 2 Invalid command line options were specified. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWzfsu | +-----------------------------+-----------------------------+ |Interface Stability |Unstable | +-----------------------------+-----------------------------+ SEE ALSO
zfs(8), zpool(8), attributes(5) SunOS 5.11 31 Oct 2005 zdb(8)

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