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Old 09-28-2004, 01:41 PM   #1
Arodef
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Slow Hardware RAID performance (Adaptec 2400A)


I installed an Adaptec 2400A RAID card connect to four 250GB ATA drives last week. Fedora Core 1 detected it fine and installed fine. However I noticed slower performance in an app I normally run. I ran hdparm and got the following results. I'm using 2199 kernel.

BTW, the system also includes two S-ATA drives connected to the mobo. /boot is mounted on one of them (sdb1), swap the other. The rest is given to a software RAID partition where I mounted / (md0). The Hardware RAID partition is /dev/sda1 below where /home is mounted.


[root@localhost root]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/md0 476599832 2106076 450283812 1% /
/dev/sdb1 2063504 35312 1923372 2% /boot
/dev/sda1 961464200 156119700 756504896 18% /home
none 1033676 0 1033676 0% /dev/shm

[root@localhost root]# hdparm -tT /dev/md0

/dev/md0:
Timing buffer-cache reads: 3884 MB in 2.00 seconds = 1942.00 MB/sec
Timing buffered disk reads: 296 MB in 3.00 seconds = 98.67 MB/sec
[root@localhost root]# hdparm -tT /dev/sdb1

/dev/sdb1:
Timing buffer-cache reads: 3912 MB in 2.00 seconds = 1956.00 MB/sec
Timing buffered disk reads: 172 MB in 3.04 seconds = 56.58 MB/sec
[root@localhost root]# hdparm -tT /dev/sda1

/dev/sda1:
Timing buffer-cache reads: 3912 MB in 2.00 seconds = 1956.00 MB/sec
Timing buffered disk reads: 88 MB in 3.05 seconds = 28.85 MB/sec
[root@localhost root]#


As you can see, the HW RAID is much slower than the SW RAID and even slower than the non-RAID partition for buffered disk reads. Any ideas? Thanks.
 
Old 09-28-2004, 02:23 PM   #2
Finlay
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what version of RAID do you have setup on the new card.
 
Old 09-28-2004, 03:40 PM   #3
Arodef
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Sorry forgot to mention that, it is RAID 0.
 
Old 09-28-2004, 03:51 PM   #4
Finlay
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i think it may be this way because of how much faster sata is
 
Old 07-19-2006, 02:56 PM   #5
kingrus
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System : P4
ADAPTEC 2400A card
2 70 GB drives SCSI
Trying to load RH ES V.4

I am trying to get this adaptec 2400A to work under RAID 1 with Linux RHE.
The OS loads but then I get "Error loading operating system"

The server had WIN 2000 Server before and worked fine. We need to move to RH and it will not load.
I have tried loading using linux dd and the Adaptec Driver.

I just want to load RHE on this server and support RAID 1.

Can anyone help
 
Old 07-19-2006, 02:59 PM   #6
Finlay
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so did you boot with the RH cd and install RH?
 
Old 07-19-2006, 03:21 PM   #7
kingrus
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Yes I did.

Yes I did, and RH installs.


Novice : Problem.

I am installing RHE ES V.4 on a system that fomerly had WIN 2000 Server.

Setup: RAID one is set through ADAPTEC SNOR and I have two drives of about 70 GB each in the RAID 1 Array.

Install: I try to install RH now on the system and seem to take it all. So the drives are being installed. However as soon as we are loaded and ready to boot. I get " Error loading operating system"

System : P4
ADAPTEC 2400A card
2 70 GB drives SCSI
Trying to load RH ES V.4

I am trying to get this adaptec 2400A to work under RAID 1 with Linux RHE.
The OS loads but then I get "Error loading operating system"

The server had WIN 2000 Server before and worked fine. We need to move to RH and it will not load.
I have tried loading using linux dd and the Adaptec Driver.

I just want to load RHE on this server and support RAID 1.

Can anyone help
 
Old 07-19-2006, 05:00 PM   #8
AwesomeMachine
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"Error Loading Operating System" is a MBR error. You install os on a single drive, and then add a drive.
 
Old 07-19-2006, 05:25 PM   #9
kingrus
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I have tried it before.

Gonna Try again.

Lets hope it works. Then I will post it all.
 
Old 07-20-2006, 12:06 AM   #10
kingrus
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Sorry did not work. Red Hat still does not load on single drive.
I reloaded RH and it gave the same error. "Error Loading Operating System"
 
  


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