i'm going to build a raid5 config with 6*maxtor 80gb mainbord is an asus p2b-d (with dual 450 and 512mb ram) and 2 addon ultra66 promise controllers i did some tests using hdparm (4.1) and i get these result : (hda and hdc are on the onboard controller) /dev/hda: Timing buffered disk reads: 64 MB in 4.94 seconds = 12.96 MB/sec /dev/hdc: Timing buffered disk reads: 64 MB in 4.94 seconds = 12.96 MB/sec /dev/hde: Timing buffered disk reads: 64 MB in 2.26 seconds = 28.32 MB/sec /dev/hdg: Timing buffered disk reads: 64 MB in 2.25 seconds = 28.44 MB/sec /dev/hdi: Timing buffered disk reads: 64 MB in 2.25 seconds = 28.44 MB/sec /dev/hdk: Timing buffered disk reads: 64 MB in 2.25 seconds = 28.44 MB/sec kernel reports : hda: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63, UDMA(33) hdc: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63, UDMA(33) hde: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63, UDMA(66) hdg: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63, UDMA(66) hdi: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63, UDMA(66) hdk: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63, UDMA(66) and i use hdparm -m16 -c1 -d1 -a8 on all hd's so why do i only see 13mb/sec on the ultra33 controller (i thought 28mb/sec would be possible on the ultra33 controller) i also made a raid0 on the 6 disks and this gives me : /dev/md0: Timing buffered disk reads: 64 MB in 2.13 seconds = 30.05 MB/sec - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
