HW SCSI Raid 0 - Dog Slow...
Hello all,
I have a Server that I have updated several things as of late. I upgraded
the debian version to Sarge. I have built a new kernel version 2.6.8. I
have upgraded the mother board and processor (Asus K8N - Sempron 3100+).
Anyway I kept the old (3 years) Adaptec Model:2400A SCSI Raid 0 array,
with IBM SCSI drives. I remember back when I put in this setup in the
server it seemed like I had to put in a couple of lines of code in some
config file to make it run at the proper speed. But being that was 3 years
ago and my memory seems to be failing by the day I cannot remember what it
was I did to make this raid array work like it should. And searching
through all the Debian list archives have yielded nothing.
The Raid array does work fine it is just slow. Here is a print out below.
of the SCSI raid compared to the IDE on the same machine. Also included
the partial output of the /usr/adm/dmesg about Adaptec 2400a.
Any ideas on how to speed up this SCSI raid array?
Thank,
Ken
SCSI vs IDE with hdparm and bonnie++
# hdparm -tT /dev/sda1
/dev/sda1:
Timing cached reads: 1164 MB in 2.12 seconds = 548.11 MB/sec
Timing buffered disk reads: 42 MB in 3.62 seconds = 11.59 MB/sec
# hdparm -tT /dev/hdc1
/dev/hdc1:
Timing cached reads: 1228 MB in 2.00 seconds = 613.17 MB/sec
Timing buffered disk reads: 136 MB in 3.04 seconds = 44.68 MB/sec
With Bonnie++
/dev/sda1
Version 1.03 ------Sequential Output------ --Sequential Input-
--Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
mail 4G 17833 45 54063 10 15559 3 21004 53 25017 3 222.3 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 3617 91 +++++ +++ +++++ +++ 2398 59 +++++ +++ 6689 75
/dev/hdc1
Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
mail 4G 18148 45 28440 5 13415 3 21671 53 34889 4 122.8 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 2707 70 +++++ +++ +++++ +++ 2701 70 +++++ +++ 6113 70
Partial output from /usr/adm/dmesg file:
Loading Adaptec I2O RAID: Version 2.4 Build 5go
Detecting Adaptec I2O RAID controllers...
Adaptec I2O RAID controller 0 at f8804000 size=100000 irq=11
dpti: If you have a lot of devices this could take a few minutes.
dpti0: Reading the hardware resource table.
TID 008 Vendor: HIGHPOINT Device: IDEhpt370 Rev: 00000001
TID 009 Vendor: HIGHPOINT Device: IDEhpt370 Rev: 00000001
TID 010 Vendor: HIGHPOINT Device: IDEhpt370 Rev: 00000001
TID 011 Vendor: HIGHPOINT Device: IDEhpt370 Rev: 00000001
TID 521 Vendor: ADAPTEC Device: RAID-0 Rev: 370L
scsi0 : Vendor: Adaptec Model: 2400A FW:370L
Vendor: ADAPTEC Model: RAID-0 Rev: 370L
Type: Direct-Access ANSI SCSI revision: 02
SCSI device sda: 321671168 512-byte hdwr sectors (164696 MB)
SCSI device sda: drive cache: write back
sda: sda1
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
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