Ok, so I hacked together this script that sysvinit should call if there is a
RAID resync in progress. I cannot tell if the bug that originally was
discovered *only* happened if swap was on a RAID device, or if swapon was
started while ANY raid device was resynchronizing. Until someone tells me
the specifics, I am sticking with the most broadest case:
so instead of:
----
if [ ! -e /proc/mdstat ] || \
[ ! grep grep swap /etc/fstab | awk -F/ '(print $3}' \
/proc/mdstat | grep resync ] ; then
swapon -a 2> /dev/null
fi
----
I am going to replace it with:
if egrep '(resync|delay)' /tmp/mdstat 2>&1 >/dev/null
then
echo "Raid resynchronization in progress, swapon delayed 10 minutes"
/etc/init.d/raiddelay.sh&
fi
and in /etc/init.d/raiddelay.sh I have:
#!/bin/sh
while egrep '(resync|delay)' /tmp/mdstat 2>&1 >/dev/null
do
sleep 10m
done
swapon -a
Does anyone see a problem with this? I wasn't sure if resync and delay would
catch all cases, but this is sure better than what is there now!
Like I said, if someone can give me the details on the kernel panic with
swap and raid resync I would gladly tune this... like just check to see if
raid is on a swap device and if so delay it then, otherwise don't delay it.
Micah
On Tue, Sep 26, 2000 at 04:09:33PM -0500, Tim Walberg wrote:
> On 09/26/2000 13:58 -0700, Micah Anderson wrote:
>
> ... stuff deleted ...
>
> >> if [ ! -e /proc/mdstat ] || \
> >> [ ! grep `grep swap /etc/fstab | awk -F/ '(print $3}'` \
> >> /proc/mdstat | grep resync ] ; then
> >> swapon -a 2> /dev/null
> >> fi
> >>
>
>
> Does this catch the case where a swap device will be
> resynced, but isn't syncing now because it has been
> serialized? I.e.:
> / = /dev/md0
> swap = /dev/md1
> md0 and md1 both have underlying partitions
> on hda and hdc
> md0 is now resyncing
> md1 needs to be resynced, but must wait
> for md0 to finish first to avoid
> severe performance degradation
>
>
>
>
> --
> +--------------------------+------------------------------+
> | Tim Walberg | [EMAIL PROTECTED] |
> | 828 Marshall Ct. | www.concentric.net/~twalberg |
> | Palatine, IL 60074 | |
> +--------------------------+------------------------------+
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