Benno,
On Fri, 07 Jan 2000 13:07:16 +0100, Benno Senoner wrote:
>I was wondering if this procedure (swapping on Raid1 + waiting for the resync),
>is safe on an IDE only system ?
>I don't need hot-swapping, the only thing I need is that if one disk dies,
>swapping will not take down the disk (hangs like in the SCSI case etc).
>
>If this is safe I can easily live with the "wait for resync" issue.
Try this: change "swap" to "raidswap" in /etc/fstab, then merge this procedure into
an
early position in your startup procedures:
>--------------------------------------------------------
#!/bin/sh
FSTAB=/etc/fstab
usage()
{
echo "usage: $0 start" >&2
exit 1
}
read_fstab()
{
awk ' {
if(NF && substr($1,1,1) != "#" && $3 == "raidswap")
print $1
} ' $FSTAB
}
check_raiddev()
{
raiddev=`basename $1`
status=`cat /proc/mdstat | awk '
/^'$raiddev' : / {
if($NF ~ /\[U*\]/)
print "OK"
else
print "NOK"
}
'`
case "$status" in
OK) return 0 ;;
*) return 1 ;;
esac
}
case "$1" in
start)
read_fstab | while read device ; do
if check_raiddev $device ; then
echo "Start swapping to $device"
swapon $device
else
echo "*** Not swapping to $device: not in sync"
fi
done
;;
stop)
# Just to prevent false usage alarms
;;
*)
usage
;;
esac
>--------------------------------------------------------
Your system will probably give some alarms at startup ("fs type raidswap not in
kernel"
or so), but just don't mind.
It's a quick hack (no check for swapping priority et al), but works fine for me.
Regards,
Robert
