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125 lines
3.2 KiB
Bash
125 lines
3.2 KiB
Bash
#!/bin/bash
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# This is the Linux version, adapted from OSX version
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# This needs to be run AS ROOT either directly or with sudo / similar
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# NOTE this only works on MIRROR pools, NOT RAIDZ
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# REF: https://askubuntu.com/questions/1231355/how-can-i-shrink-a-zfs-volume-on-ubuntu-18-04
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# NOTE - UNTested with zfs on Linux but should work with ~ZFS 0.8.6 and newer
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# REQUIRES: truncate, awk, grep, working ZFS installation v0.8.6 or newer
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# REQUIRES: an ISO to copy to the test pool
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#source ~/bin/failexit.mrg
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# REF: https://sharats.me/posts/shell-script-best-practices/
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function failexit () {
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echo '! Something failed! Code: '"$1 $2" >&2 # code (and optional description)
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exit $1
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}
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# TODO EDITME xxx
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dest=/media/sgtera2
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# Preferably should not be a ZFS target, shoot for ext4 / XFS, etc
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# You could use /home here if enough free space
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# TODO EDITME
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iso2cp=/media/toshtera10/ISO/systemrescue-9.06-amd64.iso
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[ -e $iso2cp ] || failexit 128 "ISO $iso2cp not found"
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cd $dest || failexit 44 "Cant cd to $dest"
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echo "$(date) - Creating virtual zfs disks"
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size2=4096
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size1=2048
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# NOTE not all filesystems support sparse files; if they do this should be quicker than dd
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time truncate -s ${size1}M zd1
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truncate -s ${size1}M zd2
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truncate -s ${size1}M zd3
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truncate -s ${size1}M zd4
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time truncate -s ${size2}M zd5
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truncate -s ${size2}M zd6
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truncate -s ${size2}M zd7
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time truncate -s ${size2}M zd8
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ls -lh zd*
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date
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[ -e zd1 ] || failexit 45 "Cant find zd disks in $dest"
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zp=zshrinky
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echo "$(date) - Creating zpool $zp"
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zpool create -f -o ashift=12 -O atime=off -O compression=lz4 $zp mirror \
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$PWD/zd5 $PWD/zd6 || failexit 64 "Failed to create $zp"
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zpool set autoexpand=on $zp
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df -hT /$zp
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echo "$(date) - Copying ISO to $zp"
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time cp -v $iso2cp /$zp
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ls -lh /$zp
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function zps () {
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zpool status -v $zp |awk 'NF>0'
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}
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zps
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zpool list $zp
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echo "Press Enter to shrink $zp - existing pool is ~ ${size2}M - or ^C to stop"
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read
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echo "$(date) - Adding smaller mirror disks"
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zpool add $zp mirror $PWD/zd1 $PWD/zd2
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zps
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echo "$(date) - Shrinkydink $zp"
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# Show how much before committing
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time zpool remove -n $zp mirror-0
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time zpool remove $zp mirror-0
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date
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# do forever
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while :; do
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[ $(zps |grep -c "Evacuation of mirror in progress") -eq 0 ] && break
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zps
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zpool iostat -y -T d -v $zp
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sleep 5
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done
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echo "- DONE -"
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zps
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echo ''
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zpool list $zp
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echo ''
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df -hT /$zp
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date
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echo "Dont forget to zpool destroy $zp before running this again"
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exit;
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# Example output
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pool: zshrinky
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state: ONLINE
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scan: none requested
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remove: Removal of vdev 0 copied 744M in 0h0m, completed on Wed Apr 26 00:08:13 2023
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18.2K memory used for removed device mappings
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config:
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NAME STATE READ WRITE CKSUM
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zshrinky ONLINE 0 0 0
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mirror-1 ONLINE 0 0 0
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/Volumes/sgtera2/zd1 ONLINE 0 0 0
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/Volumes/sgtera2/zd2 ONLINE 0 0 0
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errors: No known data errors
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NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
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zshrinky 1.88G 745M 1.15G - - 5% 38% 1.00x ONLINE -
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Filesystem Type Size Used Avail Use% Mounted on
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zshrinky zfs 1.8G 744M 1.1G 42% /Volumes/zshrinky
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