On 9-May-07, at 4:45 AM, Andreas Koppenhoefer wrote:
Hello,
solaris Internals wiki contains many interesting things about zfs.
But i have no glue about the reasons for this entry:
In Section "ZFS Storage Pools Recommendations - Storage Pools" you
can read:
[i]For all production environments, set up a redundant ZFS storage
pool, such as a raidz, raidz2, or a mirrored configuration,
regardless of the RAID level implemented on the underlying storage
device.[/i]
(see <http://www.solarisinternals.com/wiki/index.php/
ZFS_Best_Practices_Guide#Storage_Pools>)
In our environment we use EMC based storage subsystems which are
protected by RAID1 (mirrored disks).
What's the reason for building an upper level zfs mirror on these
already mirrored disks?
It's necessary if you wish ZFS to self-heal your data from errors
detected in the underlying subsystems. Without redundancy at the pool
level it can detect them (checksums) but not repair them.
--Toby
Or do I misinterpret solaris internals wiki?
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