From: Eichert, Diana (deichersandia.gov)
Date: Thu Aug 02 2007 - 07:41:38 CDT

• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

just recently discussed on the OpenBSD misc support list.

http://marc.info/?t=118443450500010&r=1&w=2

mailing list archives are your friend

-----Original Message-----
From: owner-techopenbsd.org on behalf of Igor Moiseev
Sent: Thu 8/2/2007 3:35 AM
To: techopenbsd.org
Subject: mpi driver

Hello,
We have in production some servers (DELL PowerEdge 840 with LSI scsi card)
with installed Openbsd 4.1.

The problem is that disk system speed is very low when the RAID-1 is
configured.
I mean that it works stably but slow. I expected at least the speed of one
disk or a bit slower.

The main question: Does anybody khow how it is possible to fix this
problem?

I found one old post related this topic (It seems the prob. still exist).
http://archive.openbsd.nu/?ml=openbsd-tech&a=2004-04&t=189139

Here below the output of speed test and dmesg. The difference in
"Sequential Output" with the standard (non RAID) openbsd machine is about
10 times!

Best regards.
Igor Moiseev.

Bonnie-----------------------------------------------------------------------
--
File './Bonnie.1678', size: 104857600
Writing with putc()...done
Rewriting...done
Writing intelligently...done
Reading with getc()...done
Reading intelligently...done
Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done...
               -------Sequential Output-------- ---Sequential Input--
--Random--
               -Per Char- --Block--- -Rewrite-- -Per Char- --Block---
--Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec
%CPU
           100 6758 5.3 6795 1.6 6105 1.8 60435 54.3 61699 11.4
321.1 2.3

DMESG------------------------------------------------------------------------
--
mpi0 at pci2 dev 8 function 0 "Symbios Logic SAS1068" rev 0x01: apic 2 int
16 (irq 3)
scsibus0 at mpi0: 112 targets
sd0 at scsibus0 targ 0 lun 0: <Dell, VIRTUAL DISK, 1028> SCSI3 0/direct
fixed
sd0: 151634MB, 151634 cyl, 16 head, 128 sec, 512 bytes/sec, 310546432 sec
total

• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]