Yes I noticed that thread a while back and have been doing a great deal of testing with various scsi_vhci options. I am disappointed that the thread hasn't moved further since I also suspect that it is related to mpt-sas or multipath or expander related.
I was able to get aggregate writes up to 500MB out to the disks but reads have not improved beyond an aggregate average of about 50-70MBps for the pool. I did not look much at read speeds during alot of my previous testing because I thought write speeds were my issue... And I've since realized that my userland write speed problem from zpool <-> zpool was actually read limited. Since then I've tried mirrors, stripes, raidz, checked my drive caches, tested recordsizes, volblocksizes, clustersizes, combinations therein, tried vol-backed luns, file-backed luns, wcd=false - etc. Reads from disk are slow no matter what. Of course - once the arc cache is populated, the userland experience is blazing - because the disks are not being read. Seeing write speeds so much faster that read strikes me as quite strange from a hardware perspective, though, since writes also invoke a read operation - do they not? _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
