SUMMARY: Prestoserve and ODS mirror

From: Anchi Zhang (
Date: Fri Dec 08 1995 - 05:14:27 CST

My original posting:

 Our Sparc 10 Solaris 2.4 NFS server runs Prestoserve 2.4.2 on ODS 4.0
 2-way metamirrors. After one submirror of a metamirror became faulty
 and thus was taken off-line by ODS, the other submirror's superblock
 got corrupted upon a reboot.
 Sun suggested 1) not to use Prestoserve on metadevices or 2) to
 metaclear the good submirror before a reboot. Has everybody else
 seen such problems and come with better solutions?

Many thanks go to (Glenn Satchell - Uniq Professional Services) (David L. Markowitz)

Glenn said he always does "a presto -d before rebooting to make sure that
the presto buffers are flushed before rebooting," and David heard a
solution that involved use of prestoserve on the underlying real devices
to have benefits of prestoserve to the metadevice.

When presto was tried on the underlying devices, ufsdump reported many of

        DUMP: Warning - directory at inode `84673' is corrupted:
          ".." points to non-directory inode `82945' - run fsck

On page 190 of DiskSuite 4.0 Administration Guide, it is stated

 When using Sun Prestoserve on a system running DiskSuite, you should
 not use Prestoserve features on metamirrors or their sunmirros.

Therefore, I turned off presto for now.


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