michael T sedwick wrote:
Given a 1.6TB ZFS Z-Raid consisting 6 disks:
And a system that does an extreme amount of small /(<20K) /random reads
/(more than twice as many reads as writes) /
1) What performance gains, if any does Z-Raid offer over other RAID or
Large filesystem configurations?
For magnetic disk drives, RAID-Z performance for small, random reads will
approximate the performance of a single disk, regardless of the number of
disks in the set. The writes will not be random, so it should perform
decently for writes.
2) What is any hindrance is Z-Raid to this configuration, given the
complete randomness and size of these accesses?
ZFS must read the entire RAID-Z stripe to verify the checksum.
Would there be a better means of configuring a ZFS environment for this
type of activity?
In general, mirrors with dynamic stripes will offer better performance and
RAS than RAID-Z.
-- richard
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
