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Re: Strange system behaviour when copying disks

To: Olaf Fr±czyk <olaf@xxxxxxxxxxxxx>
Subject: Re: Strange system behaviour when copying disks
From: Walt H <waltabbyh@xxxxxxxxxxx>
Date: Wed, 14 May 2003 08:21:04 -0700
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <1052916810.2395.15.camel@venus>
References: <1052916810.2395.15.camel@venus>
Sender: linux-xfs-bounce@xxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4b) Gecko/20030513
Olaf Fra;czyk wrote:
> Hi,
> I have linux 2.4.20 + XFS from CVS 09-Jan-2003.
> System is based on RedHat 8.0.
> Motherboard ASUS A7V266A (via KT266A chipset)
> 512MB RAM
> 2 IBM SCSI disks connected to Adaptec 2940U2W
> CD-RW, DVD-RAM connected to the same adaptec card
> 2 IBM IDE disks connected to motherboard controller
> If I copy disk /dev/hda to /dev/hdc:
> cat /dev/hda > /dev/hdc the system becomes __highly__ unresponsive
> Processor is about 90 % idle
> Load average is about 5
> Working with X is impossible (about 1 second freeze every 1-2 seconds).
> As the root partition is also XFS I have no possibility to load vanilla
> kernel and try with it. I also have no free partition on SCSI disk to
> install fresh system with vanilla kernel for testing.
> renice -19 for X makes no difference.
> Does anyone has idea why is it happening? Or maybe this is "normal"
> linux behaviour?
> I will have some free time later and I'll grab latest CVS and try it.
> Regards,
> Olaf Fraczyk

Do you have dma enabled on your IDE disks? I can't think of any reason
off the top of my head why a cat from hda -> hdc should be affected by
XFS, as you aren't using the filesystem for that - it's just reading the
raw device. Make sure dma is enabled on hda and hdc and see if that
helps:  hdparm -d1 /dev/hda /dev/hdc


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