Hi,
besides STONITH another (as I would say additional) approach in shared
scsi clusters is to use scsi reservations (2 or 3) to reserve a disk for
a host and avoid data integrity problems.
A situation were SCSI reservations are useful is the automatic mounting
of a cluster protected fs. If the administrator left the mount entry in
/etc/fstab for a cluster protected FS and additionally the application
accessing the FS is still enabled in sysv init, the fs is mounted and
the app is startet during system boot. This is true also if STONITH was
susccessful (not reset not power down). To avoid this SCSI reservations
can be used (of course a cluster _SHOULD_ be configured correctly and
tested extensivly, however things happen - think of it as an airbag).
Is there a SCSI2 or SCSI PR reservation OCF agent out there ? Has anyone
configured something like this in HB2 ?
Regards,
Robert
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