Andras Spitzer wrote:
Is it worth to move the redundancy from the SAN array layer to the ZFS layer?
(configuring redundancy on both layers is sounds like a waste to me) There are
certain advantages on the array to have redundancy configured (beyond the
protection against simple disk failure). Can we compare the advantages of
having (for example) RAID5 configured on a high-end SAN with no redundancy at
the ZFS layer versus no redundant RAID configuration on the high-end SAN but
having raidz or raidz2 on the ZFS layer?
Any tests, experience or best practices regarding this topic?
Would also like to hear about experiences with ZFS on EMC's Symmetrix.
Currently we are using VxFS with Powerpath for multipathing, and
synchronous SRDF for replication to our other datacenter.
At some point we will move to ZFS, but there are so many options how to
implement this.
From a sysadmin point of view (simplicity), I would like to use mpxio
and host based mirroring. ZFS self-healing would be available in this
configuration.
Asking EMC guys for their opinion is not an option. They will push you
to buy SRDF and Powerpath licenses... :-)
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