On Dec 15, 2006, at 7:37 AM, Jesus Cea wrote:
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I'm interesting in ZFS redundancy when vdev's are "remote". The idea,
for example, is use vdev remote mirroring as a cluster FS layer. Or
puntual backup.
Has anybody tried to mount an iscsi target as a ZFS device?. Are
machine
reboots / conectivity problems gracefully managed by ZFS?.
I use the iSCSI Target as a ZFS device quite often these days. I've
got several machines which only have a single disk and a test suite
that I use for the iSCSI target which requires access to the complete
device. So, I run the target on another machine and have the
initiator locate that device.
For remote replication there could be an issue. It would very much
depend on the link speed. The target is not aware of the link speed,
but can handle large numbers of outstanding commands. It's very
possible for the initiator to send commands that will timeout before
the data can be returned. The initiator therefore needs to determine
how fast data is being returned and throttle things so that they
don't timeout. The timeouts here are related to the SCSI I/O stack
and nothing to due with the network layer.
Hope Solaris (not express) be able to act as a iscsi target soon :-)
- --
Jesus Cea Avion _/_/ _/_/_/ _/_/_/
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"El amor es poner tu felicidad en la felicidad de otro" - Leibniz
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