rebalancing is now optional and by default off - slows down system

master
Marc Wäckerlin 7 years ago
parent 5ec9d1f164
commit acb43b032a
  1. 29
      btrfs-snapshots.sh

@ -2,9 +2,15 @@
# defaults
HOURLY_DEL=25
HOURLY_FAST=1
DAILY_DEL=8
DAILY_FAST=0
WEEKLY_DEL=5
WEEKLY_FAST=1
MONTHLY_DEL=
MONTHLY_FAST=1
FAST=0
REBALANCE=0
BTRFS_VOLUMES=${BTRFS_VOLUMES:-$(awk '!/^#/ && $3=="btrfs" {print $2}' /etc/fstab | tr '\n' ' ' | sed 's, $,,')}
TMP_MNT=${TMP_MNT:-/var/tmp/btrfs-backup}
@ -20,7 +26,8 @@ fi
vols=()
del=${DEL}
dryrun=0
fast=0
fast=${FAST}
rebalance=${REBALANCE}
periodity=${0%/*}
periodity=${periodity##*/}
if [[ $periodity =~ ^cron\... ]]; then
@ -30,10 +37,10 @@ else
fi
case "$periodity" in
(.hourly) del=${HOURLY_DEL}; fast=1;;
(.daily) del=${DAILY_DEL};;
(.weekly) del=${WEEKLY_DEL}; fast=1;;
(.monthly) del=${MONTHLY_DEL}; fast=1;;
(.hourly) del=${HOURLY_DEL}; fast=${HOURLY_FAST};;
(.daily) del=${DAILY_DEL}; fast=${DAILY_FAST};;
(.weekly) del=${WEEKLY_DEL}; fast=${WEEKLY_FAST};;
(.monthly) del=${MONTHLY_DEL}; fast=${MONTHLY_FAST};;
esac
while test $# -gt 0; do
case "$1" in
@ -45,6 +52,7 @@ OPTIONS
-h, --help show this help
-n, --dry-run execute dry run, do not backup, just show commands
-f, --fast fast run, do not optimize btrfs (otherwise done daily)
-r, --rebalance enable rebalancing (always disabled in fast mode)
-p, --path <path> add a path that contains a btrfs (sub-) volume
(defaults to: ${BTRFS_VOLUMES})
-m, --mnt <path> temporary mount point (default: ${TMP_MNT})
@ -81,6 +89,7 @@ EOF
exit;;
(-n|--dry-run) dryrun=1;;
(-f|--fast) fast=1;;
(-r|--rebalance) rebalance=1;;
(-p|--path) shift; vols+=( "$1" );;
(-m|--mnt) shift; TMP_MNT="$1";;
(-d|--del) shift; del="$1";;
@ -135,7 +144,9 @@ for fs in ${BTRFS_VOLUMES}; do
echo " " umount "$TMP_MNT"
if test $fast -eq 0; then
echo " " btrfs filesystem defragment ${fs}
echo " " btrfs balance start ${fs}
if test $rebalance -eq 1; then
echo " " btrfs balance start ${fs}
fi
fi
else
sudo btrfs subvolume snapshot "${TMP_MNT}${subvol}" "${TMP_MNT}${target}${date}"
@ -149,8 +160,10 @@ for fs in ${BTRFS_VOLUMES}; do
if test $fast -eq 0; then
echo "Defragment subvolume: '${fs}'"
sudo btrfs filesystem defragment ${fs}
echo "Rebalance subvolume: '${fs}'"
sudo btrfs balance start ${fs}
if test $rebalance -eq 1; then
echo "Rebalance subvolume: '${fs}'"
sudo btrfs balance start ${fs}
fi
fi
else
echo "ERROR: no device found for $fs" 1>&2

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