Kirk Bocek wrote: >> Joshua Baker-LePain wrote: >> I seem to have maxed out at approximately 275mb/sec on writes and about >> 200mb/sec on reads with the following configuration: >> >> Dual opteron 275's >> 2gb RAM (4 x 512mb) >> 3Ware 9550SX w/8 ports >> 8 x 750gig barracudas (RAID 0) >> 2 x 80gig seagates for the OS >> ncq off >> 9550 set to "performance" rather than "balanced" on the storsave or >> whatever that parameter was called >> ext3 file system with "blockdev --setra 16384" <-- great find! >> CentOS 4.4 64-bit >> >> I'm too chicken/paranoid/etc to fiddle with XFS since I'm cpu bound most >> of the time (encoding/fondling uncompressed video). At some point, I'll >> switch the array over to RAID5 so there is some sort of safety net, but >> right now I'm working with play data so it doesn't really matter. >> > > 3Ware's site seems to point to 300+MB/Sec with 8 disks so it sounds like > you're close. Read speed seems low. As I said, enabling memory > interleaving on my motherboard and setting the drives to 3GB/Sec made a > big difference. > > 8x750 Gig! I still remember when a friend bought his first 512MB drive and > I asked him what he was going to do with all that space! Of course that > was long before any thought of video on a PC... > I just updated with a newer motherboard bios and enabled memory interleaving and now I'm getting 201mb/sec for writes and 317mb/sec for reads. I think that's definitely fast enough for me to stop fiddling with it. :-) Cheers,