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Add Balance ionice idle priority #66

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Add Balance ionice idle priority #66

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c4bd2a6
Enhance Script to use IONICE / idle
obel1x Nov 28, 2018
5efddc8
Add Balance Priority to sysconfig
obel1x Nov 28, 2018
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18 changes: 12 additions & 6 deletions btrfs-balance.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,12 @@ fi
LOGIDENTIFIER='btrfs-balance'
. $(dirname $(realpath "$0"))/btrfsmaintenance-functions

ioprio=
if [ "$BTRFS_BALANCE_PRIORITY" = "idle" ]; then
# ionice(3) idle proirity
ioprio="ionice -c 3"
fi

{
BTRFS_BALANCE_MOUNTPOINTS=$(expand_auto_mountpoint "$BTRFS_BALANCE_MOUNTPOINTS")
OIFS="$IFS"
Expand All @@ -33,26 +39,26 @@ for MM in $BTRFS_BALANCE_MOUNTPOINTS; do
df -H "$MM"

if detect_mixed_bg "$MM"; then
btrfs balance start -musage=0 -dusage=0 "$MM"
$ioprio btrfs balance start -musage=0 -dusage=0 "$MM"
# we use the MUSAGE values for both, supposedly less aggressive
# values, but as the data and metadata space is shared on
# mixed-bg this does not lead to the situations we want to
# prevent when the blockgroups are split (ie. underused
# blockgroups)
for BB in $BTRFS_BALANCE_MUSAGE; do
# quick round to clean up the unused block groups
btrfs balance start -v -musage=$BB -dusage=$BB "$MM"
$ioprio btrfs balance start -v -musage=$BB -dusage=$BB "$MM"
done
else
btrfs balance start -dusage=0 "$MM"
$ioprio btrfs balance start -dusage=0 "$MM"
for BB in $BTRFS_BALANCE_DUSAGE; do
# quick round to clean up the unused block groups
btrfs balance start -v -dusage=$BB "$MM"
$ioprio btrfs balance start -v -dusage=$BB "$MM"
done
btrfs balance start -musage=0 "$MM"
$ioprio btrfs balance start -musage=0 "$MM"
for BB in $BTRFS_BALANCE_MUSAGE; do
# quick round to clean up the unused block groups
btrfs balance start -v -musage="$BB" "$MM"
$ioprio btrfs balance start -v -musage="$BB" "$MM"
done
fi

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8 changes: 8 additions & 0 deletions sysconfig.btrfsmaintenance
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Expand Up @@ -50,6 +50,14 @@ BTRFS_BALANCE_MOUNTPOINTS="/"
# Frequency of periodic balance.
BTRFS_BALANCE_PERIOD="weekly"

## Path: System/File systems/btrfs
## Type: string(idle,normal)
## Default: "idle"
#
# Priority of IO at which the balance process will run. Idle should not degrade
# performance as much as normal.
BTRFS_BALANCE_PRIORITY="normal"

## Path: System/File systems/btrfs
## Type: string
## Default: "1 5 10 20 30 40 50"
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