Tomasz Sucharzewski wrote:
Hello,
Ryan O'Hara wrote:
4 - Limitations
...
- Multipath devices are not currently supported.
What is the reason - it is strongly required to use at least two HBA in a SAN network, which is useless when using scsi reservation.
It has to do with how dm-multipath handles ioctls. In brief, the SCSI
registration/reservation commands use ioctls, and those need to be
passed to all devices within a dm-multipath target. This is required for
getting SCSI reservations to work, since all the I/O paths need to be
registered correctly.
I believe that this is only a limitation for RHEL4. RHEL5 should have a
fix that allows dm-multipath to properly pass ioctls to all devices.
-Ryan
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