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ZFS/zpool-expand-raidz-example.sh
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171
ZFS/zpool-expand-raidz-example.sh
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#!/bin/bash
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# (2022) Dave Bechtel - example of HOWTO properly expand a raidz / raidz2 with another vdev (increase free space)
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# Disks should be of equal size
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# REF: https://docs.oracle.com/cd/E19253-01/819-5461/gazgw/index.html
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# failexit.mrg
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function failexit () {
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echo '! Something failed! Code: '"$1 $2" # code # (and optional description)
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exit $1
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}
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echo "$(date) - Creating files for temporary zpool"
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# if truncate not installed, use dd
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if [ $(which truncate |wc -l) -gt 0 ]; then
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# if not exist in curdir, create sparse files
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[ -e zfile1 ] || time truncate -s 500M zfile{1..12}
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# NOTE this works fine on ext4, if your filesystem (OSX) does not support truncate it will require ~6GB of diskspace
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# You can probably reduce the filesize to 256MB if needed
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else
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echo "Using dd"
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[ -e zfile1 ] || for i in {1..12}; do
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time dd if=/dev/zero of=zfile$i bs=1M count=256
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done
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fi
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# Labelclear is necessary sometimes if files/disks have previously been in a zpool and are being reused
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function clearit () {
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echo "Labelclearing"
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for i in {1..12}; do
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zpool labelclear zfile$i
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done
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}
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[ "$1" = "clear" ] && clearit
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zp=ztestpoolraidz1
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echo "$(date) - Creating raidz1 pool $zp"
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zpool create -o ashift=12 -o autoexpand=on -O atime=off -O compression=lz4 $zp \
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raidz $PWD/zfile1 $PWD/zfile2 $PWD/zfile3
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# Obv. if you were scripting this for disks, you would use /dev/sdb or whatever applies
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# You can Create the pool with whatever devs are convenient,
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# but you should export and re-import with " -d /dev/disk/by-id " or whatever long format is suitable for you
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function zps () {
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# skip blank lines
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zpool status -v $zp |awk 'NF>0'
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}
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zps
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read -p "Press enter to expand raidz pool or ^C"
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(set -x
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zpool add -o ashift=12 $zp raidz $PWD/zfile4 $PWD/zfile5 $PWD/zfile6
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)
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zps
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read -p "Press enter to destroy $zp and reconfigure as raidz2, or ^C"
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zpool destroy $zp || failexit 99 "Failed to destroy $zp, cannot continue"
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zp=ztestpoolraidz2
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zpool create -o ashift=12 -o autoexpand=on -O atime=off -O compression=lz4 $zp \
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raidz2 $PWD/zfile1 $PWD/zfile2 $PWD/zfile3 $PWD/zfile4 $PWD/zfile5 $PWD/zfile6 \
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|| failexit 101 "Failed to create raidz2 $zp, cannot continue"
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zps
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read -p "Press enter to expand raidz2 pool with another vdev or ^C"
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(set -x
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zpool add -o ashift=12 $zp raidz2 $PWD/zfile7 $PWD/zfile8 $PWD/zfile9 $PWD/zfile10 $PWD/zfile11 $PWD/zfile12
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)
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zps
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read -p "Thus endeth the lesson. Press enter to destroy $zp, or ^C"
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zpool destroy $zp || failexit 199 "Failed to destroy $zp, please destroy manually"
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echo "$zp Destroyed. Please delete zfile* manually,"
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exit;
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Troubleshooting:
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If necessary run ' zpool labelclear ' against the files or delete zfile1 to recreate the files
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^^ Pass "clear" to this script as parameter
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By default, this script does NOT delete the zfiles when done. Consider it a safety feature.
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/home # truncate -s 500M zfile{1..6}
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total 885468
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drwxr-xr-x 5 root root 4096 Feb 21 01:18 .
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drwxr-xr-x 22 root root 4096 Dec 21 2020 ..
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-rw-r--r-- 1 root root 524288000 Feb 21 01:18 zfile1
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-rw-r--r-- 1 root root 524288000 Feb 21 01:18 zfile2
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-rw-r--r-- 1 root root 524288000 Feb 21 01:18 zfile3
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-rw-r--r-- 1 root root 524288000 Feb 21 01:18 zfile4
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-rw-r--r-- 1 root root 524288000 Feb 21 01:18 zfile5
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-rw-r--r-- 1 root root 524288000 Feb 21 01:18 zfile6
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pool: ztestpoolraidz1
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state: ONLINE
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scan: none requested
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config:
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NAME STATE READ WRITE CKSUM
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ztestpoolraidz1 ONLINE 0 0 0
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raidz1-0 ONLINE 0 0 0
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/home/zfile1 ONLINE 0 0 0
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/home/zfile2 ONLINE 0 0 0
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/home/zfile3 ONLINE 0 0 0
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raidz1-1 ONLINE 0 0 0
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/home/zfile4 ONLINE 0 0 0
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/home/zfile5 ONLINE 0 0 0
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/home/zfile6 ONLINE 0 0 0
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errors: No known data errors
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pool: ztestpoolraidz2
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state: ONLINE
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scan: none requested
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config:
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NAME STATE READ WRITE CKSUM
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ztestpoolraidz2 ONLINE 0 0 0
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raidz2-0 ONLINE 0 0 0
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/home/zfile1 ONLINE 0 0 0
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/home/zfile2 ONLINE 0 0 0
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/home/zfile3 ONLINE 0 0 0
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/home/zfile4 ONLINE 0 0 0
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/home/zfile5 ONLINE 0 0 0
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/home/zfile6 ONLINE 0 0 0
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raidz2-1 ONLINE 0 0 0
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/home/zfile7 ONLINE 0 0 0
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/home/zfile8 ONLINE 0 0 0
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/home/zfile9 ONLINE 0 0 0
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/home/zfile10 ONLINE 0 0 0
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/home/zfile11 ONLINE 0 0 0
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/home/zfile12 ONLINE 0 0 0
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errors: No known data errors
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If you cannot destroy the zpool, make sure a shell does not have it held open somewhere with " lsof |grep ztestpool "
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Any process holding the pool open ( cd /ztestpoolraidzX # is sufficient ) needs to CD out of it or be killed
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NOTE: What you DONT WANT is "hanging drives" that are not part of the raidz - if your pool looks like this,
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somebody f**ked it up:
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pool: ztestpoolraidz1
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state: ONLINE
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scan: none requested
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config:
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NAME STATE READ WRITE CKSUM
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ztestpoolraidz1 ONLINE 0 0 0
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raidz1-0 ONLINE 0 0 0
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/home/zfile1 ONLINE 0 0 0
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/home/zfile2 ONLINE 0 0 0
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/home/zfile3 ONLINE 0 0 0
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raidz1-1 ONLINE 0 0 0
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/home/zfile4 ONLINE 0 0 0
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/home/zfile5 ONLINE 0 0 0
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/home/zfile6 ONLINE 0 0 0
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/home/zfile7 ONLINE 0 0 0
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errors: No known data errors
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NOTE you really have to work at it to mess this up by FORCING zfs to improperly add the dev:
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# zpool add ztestpoolraidz1 $PWD/zfile7
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invalid vdev specification
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use '-f' to override the following errors:
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mismatched replication level: pool uses raidz and new vdev is file
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If your pool vdevs are not properly balanced, you will need to backitup, destroy / recreate it with proper
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balanced vdevs, and Restore - if you leave it unbalanced and the wrong drive fails, the whole pool can fail!
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