From: Anders Norrbring (lists_at_norrbring.se)
Date: Wed Feb 16 2005 - 09:28:31 CET
From: "Anders Norrbring" <lists@norrbring.se> Date: Wed, 16 Feb 2005 09:28:31 +0100 Message-Id: <20050216082831.8F493D5A5@mail.the-server.net> Subject: RE: [suse-sles-e] File systems and SCSI Arrays...
> On Tuesday, February 15, 2005 01:28 pm, Anders Norrbring wrote:
> > The disk space is located on a Compaq Smart Array 3200 controller.
> > The controller takes care of everything regarding RAID, so that part
> > doesn't load the Linux system.
> > The system loads the driver cpqarray in initrd, everything seems fine
> > so far.
> >
> > The problem is that when the file system gets a load, for example if
> > I copy large files to the volume, it takes forever to complete and
> > the system seems hanged. After 10-90 seconds, it continues its work.
> > If I have one window open with 'top', that too freezes during this
> > period.
> >
> > Since it's SuSE SLES9, I formatted everything with reiserfs, my
> > thinking wass that this may be the problem, but then I tried with XFS
> > as well, just the same problem.. I'm just guessing.. If someone can
> > clear things up, I'd be grateful..
>
> Anders,
>
> I've got a SLES9 box running on an old Compaq 6400r with a SmartArray
> 3200 controller and I see none of the issues you are having. Reiser
> shouldn't make a difference (although I now prefer ext3...)
>
> If your box is a Compaq box, did you SmartStart it before installing
> SuSE? (The choice of OS to be installed sets the BIOS up correctly.)
>
> Also, check your boot options in grub and look for the "elevator= "
> parameter. If it is set to "as", try changing it to "cfq" or
> "deadline" and see what happens after a reboot. (My Compaq has the
> parm set to "cfq"; as I understand it, RAID controllers will see poorer
> performance if the parm is set to "as".)
Thanks Mark,
No, this isn't in a Compaq system, so I can't use the SmartStart CD.. In my
grub's menu.lst, I have:
kernel (hd0,1)/boot/vmlinuz root=4802 vga=0x31a splash=silent
resume=/dev/ida/c0d0p1 showopts
So, there's no "elevator" at all set, perhaps that's the problem... I really
haven't spent any time to study kernel and boot options, since I haven't
found any documentation at all regarding this old SA 3200 controller. I've
just moved it from an old Compaq server that ran W2k..
I guess I need to find boot/kernel options that can have effect on the Smart
Array, I just don't know where to start... I'll try to set "elevator=cfg"
in my grub as well, perhaps it can do some good.. :)
Later,
Anders Norrbring
Norrbring Consulting
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