From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: James Vanns <jimv@canterbury.ac.uk>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Kernel 2.4: Load average scaling to 200!
Date: Wed, 03 Sep 2003 18:16:28 +0100 [thread overview]
Message-ID: <1062609387.19058.138.camel@dhcp23.swansea.linux.org.uk> (raw)
In-Reply-To: <1062605821.23773.15.camel@eeyore.ntnet.cc.local>
On Mer, 2003-09-03 at 17:17, James Vanns wrote:
> When using mt on RedHat Linux 8 running kernel 2.4.20 to fsf on an LTO
> tape drive the load average soars to 100+ and denies everyone the mail
> service it's used for (IMAP). I have to reboot the server as I cannot
> kill mt.
I can think of two possible causes here. #1 is that something hung the
scsi bus because of a crash - be it kernel, mt, hardware whatever. The
other one some people hit with tape drives is that they don't have
disconnect enabled on the drive (check your drive manuals). With
disconnect disabled the tape will hog the bus for the entire time it
is doing a command.
The tapes I have don't seem to take long enough to fsf (even if they are
past the last marker) to worry too much however.
Do you also get messages about scsi timeouts
What card ?
prev parent reply other threads:[~2003-09-03 17:19 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-03 16:17 James Vanns
2003-09-03 17:16 ` Alan Cox [this message]
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