Hello
Im running a Raid 5 with 4 160 GB Discs.
Every Disc is running on 1 port of a promise controller.
That means that i have got 2 Promise Rais controllers in the box.
The discs in single mode are fast, but the raid is slow.
Here you have got some hdparm output.
Does anyone have an idea how the problem can be solved?
Thx for your help
buliwyf
utgard:~# hdparm -tT /dev/hde1 ;hdparm -tT /dev/hdg1 ;hdparm -tT /dev/hdi1 ;hdparm -Tt /dev/hdk1 ;hdparm -tT /dev/md0
/dev/hde1:
Timing buffer-cache reads: 128 MB in 0.44 seconds =288.98 MB/sec
Timing buffered disk reads: 64 MB in 1.31 seconds = 48.86 MB/sec
/dev/hdg1:
Timing buffer-cache reads: 128 MB in 0.44 seconds =293.62 MB/sec
Timing buffered disk reads: 64 MB in 1.27 seconds = 50.56 MB/sec
/dev/hdi1:
Timing buffer-cache reads: 128 MB in 0.43 seconds =298.41 MB/sec
Timing buffered disk reads: 64 MB in 3.50 seconds = 18.30 MB/sec
/dev/hdk1:
Timing buffer-cache reads: 128 MB in 0.42 seconds =301.22 MB/sec
Timing buffered disk reads: 64 MB in 1.29 seconds = 49.58 MB/sec
/dev/md0:
Timing buffer-cache reads: 128 MB in 0.43 seconds =294.30 MB/sec
Timing buffered disk reads: 64 MB in 1.96 seconds = 32.62 MB/sec
utgard:~# cat /etc/raidtab
raiddev /dev/md0
raid-level 5
nr-raid-disks 4
nr-spare-disks 0
persistent-superblock 1
parity-algorithm left-symmetric
chunk-size 32
device /dev/hde1
raid-disk 0
device /dev/hdg1
raid-disk 1
device /dev/hdi1
raid-disk 2
device /dev/hdk1
raid-disk 3
utgard:~# hdparm /dev/hde
/dev/hde:
multcount = 16 (on)
I/O support = 3 (32-bit w/sync)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 19457/255/63, sectors = 312581808, start = 0
busstate = 1 (on)
utgard:~# hdparm /dev/hdg
/dev/hdg:
multcount = 16 (on)
I/O support = 3 (32-bit w/sync)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 19457/255/63, sectors = 312581808, start = 0
busstate = 1 (on)
utgard:~# hdparm /dev/hdi
/dev/hdi:
multcount = 16 (on)
I/O support = 3 (32-bit w/sync)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 19457/255/63, sectors = 312581808, start = 0
busstate = 1 (on)
utgard:~# hdparm /dev/hdk
/dev/hdk:
multcount = 16 (on)
I/O support = 3 (32-bit w/sync)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 19457/255/63, sectors = 312581808, start = 0
busstate = 1 (on)
utgard:~# hdparm /dev/md0
/dev/md0:
readonly = 0 (off)
geometry = 37824/2/4, sectors = 937729536, start = 0
utgard:~#
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