With my (COTS) LSI 1068 and 1078 based controllers I get consistently better performance when I export all disks as jbod (MegaCli - CfgEachDskRaid0).
I even went through all the loops and hoops with 6120's, 6130's and even some SGI storage and the result was always the same; better performance exporting single disk than even the "ZFS" profiles within CAM. --- 'pool0': #zpool create pool0 mirror c2t0d0 c2t1d0 #zpool add pool0 mirror c2t2d0 c2t3d0 #zpool add pool0 mirror c2t4d0 c2t5d0 #zpool add pool0 mirror c2t6d0 c2t7d0 'pool2': #zpool create pool2 raidz c3t8d0 c3t9d0 c3t10d0 c3t11d0 #zpool add pool2 raidz c3t12d0 c3t13d0 c3t14d0 c3t15d0 ---- I have really learned not to do it this way with raidz and raidz2: #zpool create pool2 raidz c3t8d0 c3t9d0 c3t10d0 c3t11d0 c3t12d0 c3t13d0 c3t14d0 c3t15d0 So when is thumper going to have an all SAS option? :) -Andy On Feb 7, 2008, at 2:28 PM, Joel Miller wrote: > Much of the complexity in hardware RAID is in the fault detection, > isolation, and management. The fun part is trying to architect a > fault-tolerant system when the suppliers of the components can not > come close to enumerating most of the possible failure modes. > > What happens when a drive's performance slows down because it is > having to go through internal retries more than others? > > What layer gets to declare a drive dead? What happens when you start > declaring the drives dead one by one because of they all seemed to > stop responding but the problem is not really the drives? > > Hardware RAID systems attempt to deal with problems that are not > always straight forward...Hopefully we will eventually get similar > functionality in Solaris... > > Understand that I am a proponent of ZFS, but everything has it's use. > > -Joel > > > This message posted from opensolaris.org > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
