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?
2) What is any hindrance is Z-Raid to this configuration, given the
complete randomness and size of these accesses?
Would there be a better means of configuring a ZFS environment for this
type of activity?
thanks;
A 6 disk raidz set is not optimal for random reads, since each disk in
the raidz set needs to be accessed to retrieve each item. Note that if
the reads are single threaded, this doesn't apply. However, if multiple
reads are extant at the same time, configuring the disks as 2 sets of
3 disk raidz vdevs or 3 pairs of mirrored disk will result in 2x and 3x
(approx) total parallel random read throughput.
- Bart
--
Bart Smaalders Solaris Kernel Performance
[EMAIL PROTECTED] http://blogs.sun.com/barts
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
