fallback# zfs list
NAME USED AVAIL REFER MOUNTPOINT
zroot 5.39G 581G 344M /
zroot/swap 4.13G 585G 16K -
zroot/tmp 36K 581G 36K /tmp
zroot/usr 952M 581G 270M /usr
zroot/usr/home 61K 581G 61K /usr/home
zroot/usr/ports 333M 581G 310M /usr/ports
zroot/usr/ports/distfiles 23.6M 581G 23.6M /usr/ports/distfiles
zroot/usr/ports/packages 31K 581G 31K /usr/ports/packages
zroot/usr/src 349M 581G 349M /usr/src
zroot/var 572K 581G 126K /var
zroot/var/crash 31.5K 581G 31.5K /var/crash
zroot/var/db 198K 581G 99K /var/db
zroot/var/db/pkg 98.5K 581G 98.5K /var/db/pkg
zroot/var/empty 31K 581G 31K /var/empty
zroot/var/log 50.5K 581G 50.5K /var/log
zroot/var/mail 31K 581G 31K /var/mail
zroot/var/run 73K 581G 73K /var/run
zroot/var/tmp 32K 581G 32K /var/tmp
zfs create -V 4G zroot/swap
zfs set org.freebsd:swap=on zroot/swap
zfs set checksum=off zroot/swap
I have an unused 640GB drive as zroot and I thought when only 5GB are in use for the whole system what would be wrong for more swap?However, 4G should be more than enough (depending on your RAM situation).
# swapoff /dev/zvol/zroot/swap
# zfs destroy zroot/swap
# zfs create -o org.freebsd:swap=on -o checksum=off -V 8G zroot/swap
# swapon /dev/zvol/zroot/swap
# zfs get all zroot/swap
refreservation=4G
reservation=4G
# zfs set refreservation=8G zroot/swap
# zfs set reservation=8G zroot/swap
# zfs get all zroot/swap
NAME PROPERTY VALUE SOURCE
zroot/swap type volume -
zroot/swap creation Sat May 5 15:03 2012 -
zroot/swap used 4.13G -
zroot/swap available 585G -
zroot/swap referenced 16K -
zroot/swap compressratio 1.00x -
zroot/swap reservation none default
zroot/swap volsize 4G local
zroot/swap volblocksize 8K -
zroot/swap checksum off local
zroot/swap compression off default
zroot/swap readonly off default
zroot/swap copies 1 default
zroot/swap refreservation 4.13G local
zroot/swap primarycache all default
zroot/swap secondarycache all default
zroot/swap usedbysnapshots 0 -
zroot/swap usedbydataset 16K -
zroot/swap usedbychildren 0 -
zroot/swap usedbyrefreservation 4.13G -
zroot/swap logbias latency default
zroot/swap dedup off default
zroot/swap mlslabel -
zroot/swap sync standard default
zroot/swap refcompressratio 1.00x -
zroot/swap org.freebsd:swap on local
# zfs set refreservation=8G zroot/swap
cannot set property for 'zroot/swap': 'refreservation' is greater than current volume size
# zfs set volsize=8G zroot/swap
# zfs set refreservation=8G zroot/swap
# zfs set reservation=8G zroot/swap
bsus said:Hi jem,
can I do this in active state without the danger of having a kernel panic?