zfs discuss - Jan 2011 - Host based zfs config with Oracle''s Unified Storage 7000 series

My question regarding the 7000 series storage is in more of the perspective of
the HOST side ZFS config. It is my understanding that the 7000 storage displays
a FC lun to the host. Yes, this LUN is a ZFS lun in the 7000 storage, however
the host still sees this as only one LUN. If I configure a host based ZFS
storage device on top of this LUN I have no host based zfs redundancy. So do we
still need to create a host based ZFS mirror or a host based ZFS raidz device
when use a 7000 series storage array?

Thanks,
Shawn
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This message posted from opensolaris.org

On Sun, 2 Jan 2011, Shawn Joy wrote:
> My question regarding the 7000 series storage is in more of the 
> perspective of the HOST side ZFS config. It is my understanding that 
> the 7000 storage displays a FC lun to the host. Yes, this LUN is a 
> ZFS lun in the 7000 storage, however the host still sees this as 
> only one LUN. If I configure a host based ZFS storage device on top 
> of this LUN I have no host based zfs redundancy. So do we still need 
> to create a host based ZFS mirror or a host based ZFS raidz device 
> when use a 7000 series storage array?
It is a matter of how much is "good enough".  You don''t have
to use a
mirror from the host, but there is still less chance of data loss or 
interruption if you do, and particularly if the devices are hosted on 
different storage arrays so you can keep on trucking if one goes down.

Bob
-- 
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/