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Legacy Forums => Experienced User Forum => Topic started by: Joshua on March 10, 2002, 08:06:52 AM

Title: SMP + Hardware RAID5 Poor Performance
Post by: Joshua on March 10, 2002, 08:06:52 AM

Hello, I thought I'd fish for comments here...

Here's the setup:
e-smith 5.1.2
Proliant 2500 (dual PPro), SMP kernel
Mylex 250 RAID Controller w/5 18.2 gigs setup RAID 5

The problem seems to be with IO. Everytime I access server-manager and modify a config the drive lights will come on and it seems to take forever for the server to finish. Even something as little as changing a user's password will cause a 20 second delay in response from the server. Logging in as root on the console will even take about 4 seconds to get a prompt. I've setup a single PPro machine with a single 4 gig drive and the performance is much better. Any ideas anyone???

Thanks,

Joshua

Title: Re: SMP + Hardware RAID5 Poor Performance
Post by: guestHH on March 10, 2002, 12:59:47 PM

Hi,

Maybe this thread can help you.

http://forums.contribs.org/index.php?topic=13085.msg49342#msg49342

Regards,
guestHH

Title: Re: SMP + Hardware RAID5 Poor Performance
Post by: Gene Cooper on March 13, 2002, 10:39:14 PM

Joshua,

Did you have to do anything special to get SME 5.1.2 installed on the RAID array using the Mylex controller?

I'm trying to install on a Mylex AccelleRAID 352 and the installation blows up at the very end where it states "Performing post-install..."

Thanks,

G

Title: Re: SMP + Hardware RAID5 Poor Performance
Post by: Joshua on March 13, 2002, 10:52:40 PM

I wish I could give you more info, but I didn't have any problems there. Any error messages?

I have a 352 I just picked up on eBay though, I was planning to slap it on a new sme machine. If you find out what's going on please let me know.

Gene Cooper wrote:
>
> Joshua,
>
> Did you have to do anything special to get SME 5.1.2
> installed on the RAID array using the Mylex controller?
>
> I'm trying to install on a Mylex AccelleRAID 352 and the
> installation blows up at the very end where it states
> "Performing post-install..."
>
> Thanks,
>
> G

Title: Update: SMP + Hardware RAID5 Poor Performance
Post by: Joshua on March 13, 2002, 10:56:10 PM

I thought I'd add some info here. Copying files to the raid is extremely fast, it's only when the system has to read/write from the stripe that it bogs so painfully.

--Josh

Title: Re: SMP + Hardware RAID5 Poor Performance
Post by: Gene Cooper on March 13, 2002, 11:47:39 PM

I resolved the problem by disabling the built-in Adaptec SCSI controller on the mainboard, performing the install, then reenabling the on-board controller.

Now I just  have to find the best spot to insmod the aic7xxx module...

Thanks,

G

Title: same problem
Post by: Thijs Nijpjes on March 19, 2002, 03:01:38 PM

Hi,

I've the same problem with my 2500 server. I found that E-smith only reconises 16  MB of RAM. with both controlers enabled. Don't know what happens if I disables one.

I'm going to start a thread about the memory question.