which one is the most performant: copies=2 or zfs-mirror?
s. On 5/9/07, Richard Elling <[EMAIL PROTECTED]> wrote:
comment below... Toby Thain wrote: > > 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. Yes, however with copies, it is not necessarily required that we build a redundant zpool. I'll update the wiki. -- richard _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
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