topic Re: HP NetRAID 1M in Netservers

HP NetRAID 1M

Mike Willour — Fri, 10 May 2002 14:54:44 GMT

We are having a disk I/O bottleneck on our newly installed SCO OPENSERVER 5.0.5 [HP LC2000 SERVER] when certain applications are running. Specifically when we run an online cpio to a backup directory on the HP NetRAID 1M or even a separate SCSI hard drive the system slows down to a crawl during the backup.

Could the AMIRD/NetRaid driver be the problem or how do I find a better driver - or am I looking in the wrong area to improve the performance of the server ?
thanks for any help.

Re: HP NetRAID 1M

Theo Hill_1 — Fri, 10 May 2002 15:44:30 GMT

What PCI cards are in the system and which slots are they using?

Re: HP NetRAID 1M

Mike Willour — Fri, 10 May 2002 18:18:31 GMT

there is one PCI card, the NetRadid 1M and it is in slot #1

Re: HP NetRAID 1M

Mike Willour — Fri, 10 May 2002 18:18:53 GMT

there is one PCI card, the NetRaid 1M and it is in slot #1

Re: HP NetRAID 1M

Theo Hill_1 — Fri, 10 May 2002 18:59:11 GMT

and when you add the SCSI card, where is it added?

Re: HP NetRAID 1M

Mike Willour — Fri, 10 May 2002 19:17:59 GMT

onboard scsi controller

Re: HP NetRAID 1M

Marino Meloni_1 — Fri, 10 May 2002 19:37:38 GMT

netraid 1M didn't use the write back cache because there is no battery in case of power failure, this can corrupt data,
Try to put the cache policy to write trought to see if the performances inprove.
In this case, you have to move to a supperior netraid controller like 2M

bye
marino

Re: HP NetRAID 1M

Greg Carlson — Fri, 10 May 2002 19:44:58 GMT

Mike,

I'm not an expert in SCO but check this link out and see if it helps you on the path..

http://groups.google.com/groups?hl=en&threadm=yfgx3.1266%24Ik5.11318%40dfw-read.news.verio.net&rnum=1&prev=/groups%3Fhl%3Den%26q%3Dcpio%2Bsco%2Bslow%2Bbackup

Ciao,
Greg

Re: HP NetRAID 1M

Mike Willour — Fri, 10 May 2002 20:00:08 GMT

the default cache policy is set to write through.
We are thinking it is an O/S problem,

one site told me that the SCO Unix HP technicians said to disable the ami raid monitor, /etc/idrc.d/amird [amirdmon] which I have not yet tried. Earlier in the week I came across that suggestion but there was a disclaimer that said it could create other problems so I didn't try that option.

Unfortunately I'm off for the next two weeks on vacation in Hawaii so I won't be able to communicate back to you ... great helpers until then. I will let an associate in on this thread and if he can he will keep the solution ball rolling. Thanks for all your help past..present and future.
as they say in Hawaii
Aloha nui nui !
thank you very much !

Re: HP NetRAID 1M

Marino Meloni_1 — Mon, 13 May 2002 08:27:22 GMT

NIke,
Sorry for mistyping, to check cache issue, try to set it as write back, this is more efficient, but less protective is case of power failure
bye

marino