On Mon, Apr 16, 2012 at 11:20:13PM +1000, Russell Coker wrote:
That said, ZFS supports RAID-6 AKA RAID-Z2. Given the prices of 3TB disks and the fact that reasonably affordable servers can handle 8 disks which allows 18TB of RAID-6 storage it seems like a RAID-Z2 with ZFS is clearly a better
choice for most uses (the copy on write feature of ZFS apparently removes the worst performance problems of RAID-5 and RAID-6).
the thing that *really* eliminates the write performance problem is to add a fast SSD as a ZFS Intent Log ("ZIL" - a write cache). maybe a 120-ish GB SSD with a small (4GB, perhaps 8GB) partition for ZIL and the remainder for read-caching. a smaller SSD would be fine too, but larger SSDs tend to be faster, and they price difference between 60Gb and 120GB isn't that great. craig -- craig sanders <cas@taz.net.au> BOFH excuse #290: The CPU has shifted, and become decentralized.