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
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This archive was generated by hypermail 2b29 : Mon Apr 23 2001 - 21:00:42 EST