I have an OpenSolaris (technically OI 147) box running ZFS with Comstar (zpool version 28, zfs version 5) The box is a 2950 with 32 GB of RAM, Dell SAS5/e card connected to 6 Promise vTrak J610sD (dual controller SAS) disk shelves spread across both channels of the card (2 chains of 3 shelves). We currently have: 4 x OCZ Vertex 2 SSD''s configured as a ZIL (We''ve been experimenting without a dedicated ZIL, with 2 mirrors, and with 4 individual drives- these are not meant to be a permanent part of the array- they were installed to evaluate limited SSD benefits) 2 x 300GB 15k RPM Hot Spare drives- one on each channel 2 x 600GB 15k RPM Hot Spare drives- one on each channel 52 x 300GB 15k RPM disks configured as 4 Disk RAIDz (13 zdevs) 20 x 600GB 15k RPM disks configured as 4 disk RAIDz (5 zdevs) (Eventually there will be 16 more 600GB disks -4 more zdevs for a total of 22 zdevs) Most of our disk access is through COMSTAR via iSCSI. That said- even performance tests direct to the local disks reveal good, but not great performance. Most of our sequential write performance tests show about 200 MB/sec to the storage which seems pretty low given the disk''s and their individual performance. I''d love to have configured the disks as mirrors but I needed a minimum of 20 TB in the space provided and I could not achieve that when using mirrors. Can anyone provide a link to good performance analysis resources so I can try to track down where my limited write performance is coming from? -- This message posted from opensolaris.org