Author: netchild
Date: Tue Jun 15 08:58:16 2010
New Revision: 209195
URL: http://svn.freebsd.org/changeset/base/209195
Log:
Add a periodic zfs scrub script.
Features:
- configurable amount of days between scrubs (default value or per pool)
- do not scrub directly after pool creation (respects the configured
number of days between scrubs)
- do not scrub if a scrub is in progress
- tells how to see the status of the scrub
- tells how many days since the last scrub if it skips the scrubbing
- warns if a non-existent pool is specified explicitely
(default: no pools specified -> all currently imported pools are
handled)
- runs late in the periodic run to not slow down the other periodic daily
scripts
Discussed on: fs@
Added:
head/etc/periodic/daily/800.scrub-zfs (contents, props changed)
Modified:
head/share/man/man5/periodic.conf.5
Added: head/etc/periodic/daily/800.scrub-zfs
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/etc/periodic/daily/800.scrub-zfs Tue Jun 15 08:58:16 2010
(r209195)
@@ -0,0 +1,86 @@
+#!/bin/sh
+#
+# $FreeBSD$
+#
+
+# If there is a global system configuration file, suck it in.
+#
+if [ -r /etc/defaults/periodic.conf ]
+then
+ . /etc/defaults/periodic.conf
+ source_periodic_confs
+fi
+
+: ${daily_scrub_zfs_default_threshold=30}
+
+case "$daily_scrub_zfs_enable" in
+ [Yy][Ee][Ss])
+ echo
+ echo 'Scrubbing of zfs pools:'
+
+ if [ -z "${daily_scrub_zfs_pools}" ]; then
+ daily_scrub_zfs_pools="$(zpool list -H -o name)"
+ fi
+
+ for pool in ${daily_scrub_zfs_pools}; do
+ # sanity check
+ zpool list ${pool} >/dev/null 2>&1
+ if [ $? -ne 0 ]; then
+ echo " WARNING: pool '${pool}' specified in"
+ echo "
'/etc/periodic.conf:daily_scrub_zfs_pools'"
+ echo " does not exist"
+ continue
+ fi
+
+ # successful only if there is at least one pool to scrub
+ rc=0
+
+ # determine how many days shall be between scrubs
+ eval _pool_threshold=\${daily_scrub_zfs_${pool}_threshold}
+ if [ -z "${_pool_threshold}" ];then
+ _pool_threshold=${daily_scrub_zfs_default_threshold}
+ fi
+
+ _last_scrub=$(zpool history ${pool} | \
+ egrep "^[0-9\.\:\-]{19} zpool scrub ${pool}\$" | tail -1 |\
+ cut -d ' ' -f 1)
+ if [ -z "${_last_scrub}" ]; then
+ # creation time of the pool if no scrub was done
+ _last_scrub=$(zpool history ${pool} | \
+ sed -ne '2s/ .*$//p')
+ fi
+
+ # Now minus last scrub (both in seconds) converted to days.
+ _scrub_diff=$(expr -e \( $(date +%s) - \
+ $(date -j -f %F.%T ${_last_scrub} +%s) \) / 60 / 60 / 24)
+ if [ ${_scrub_diff} -le ${_pool_threshold} ]; then
+ echo " skipping scrubbing of pool '${pool}':"
+ echo " last scrubbing is ${_scrub_diff} days ago,
threshold is set to ${_pool_threshold} days"
+ continue
+ fi
+
+ _status="$(zpool status ${pool} | grep scrub:)"
+ case "${_status}" in
+ *"scrub in progress"*)
+ echo " scrubbing of pool '${pool}' already in
progress, skipping:"
+ ;;
+ *"none requested"*)
+ echo " starting first scrubbing (after
reboot) of pool '${pool}':"
+ zpool scrub ${pool}
+ ;;
+ *)
+ echo " starting scrubbing of pool '${pool}':"
+ zpool scrub ${pool}
+ ;;
+ esac
+
+ echo " consult 'zpool status ${pool}' for the result"
+ done
+ ;;
+
+ *)
+ rc=0
+ ;;
+esac
+
+exit $rc
Modified: head/share/man/man5/periodic.conf.5
==============================================================================
--- head/share/man/man5/periodic.conf.5 Tue Jun 15 08:53:13 2010
(r209194)
+++ head/share/man/man5/periodic.conf.5 Tue Jun 15 08:58:16 2010
(r209195)
@@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd May 12, 2007
+.Dd June 15, 2010
.Dt PERIODIC.CONF 5
.Os
.Sh NAME
@@ -611,6 +611,25 @@ when
.Va daily_queuerun_enable
is set to
.Dq Li YES .
+.It Va daily_scrub_zfs_enable
+.Pq Vt bool
+Set to
+.Dq Li YES
+if you want to run a zfs scrub periodically.
+.It Va daily_scrub_zfs_pools
+.Pq Vt str
+A space separated list of names of zfs pools to scrub.
+If the list is empty or not set, all zfs pools are scrubbed.
+.It Va daily_scrub_zfs_default_threshold
+.Pq Vt int
+Number of days between a scrub if no pool-specific threshold is set.
+The default value if no value is set is 30.
+.It Va daily_scrub_zfs_ Ns Ao Ar poolname Ac Ns Va _threshold
+.Pq Vt int
+The same as
+.Va daily_scrub_zfs_default_threshold
+but specific to the pool
+.Va Ns Ao Ar poolname Ac Ns .
.It Va daily_local
.Pq Vt str
Set to a list of extra scripts that should be run after all other
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