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Serial scrub for raid5 and raid6 devices #116

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Serial scrub for raid5 and raid6 devices #116

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7b30535
is_raid56: check if filesystem is on a RAID-5 or RAID-6
qiwichupa Feb 3, 2024
a70aa4f
sequential device scrubbing for RAID 5 or 6
qiwichupa Feb 3, 2024
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16 changes: 15 additions & 1 deletion btrfs-scrub.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,21 @@ for MNT in $BTRFS_SCRUB_MOUNTPOINTS; do
echo "Path $MNT is not btrfs, skipping"
continue
fi
run_task btrfs scrub start -Bd $ioprio $readonly "$MNT"

if ! is_raid56 "$MNT"; then
echo "RAID level is not 5 or 6, parallel device scrubbing"
run_task btrfs scrub start -Bd $ioprio $readonly "$MNT"
else
echo "RAID level is 5 or 6, sequential device scrubbing"
for DEV in $(btrfs filesystem show "$MNT" | awk '/ path /{print $NF}')
do
run_task btrfs scrub start -Bd $ioprio $readonly "$DEV"
until btrfs scrub status "$DEV" | grep finished
do
sleep 5
done
done
fi
if [ "$?" != "0" ]; then
echo "Scrub cancelled at $MNT"
exit 1
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10 changes: 10 additions & 0 deletions btrfsmaintenance-functions
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Expand Up @@ -77,6 +77,16 @@ is_btrfs() {
return 1
}

# function: is_raid56
# parameter: path to a mounted filesystem
#
# check if filesystem is on a RAID-5 or RAID-6
is_raid56() {
btrfs filesystem usage "$1" | grep Data,RAID5 && return 0
btrfs filesystem usage "$1" | grep Data,RAID6 && return 0
return 1
}

# function: btrfs_fsid
# parameter: path to a mounted filesystem
#
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