ZFS: Verify/change properties of a zfs filesystem -

ZFS: Verify/change properties of a zfs filesystem

# Tested on RHEL 6 & 7

ZPOOL=c_pool
ZFSFS=zfs01

# Check the properties of the filesystem

zfs get all $ZPOOL/$ZFSFS
   NAME          PROPERTY              VALUE                  SOURCE
   c_pool/zfs01 type                  filesystem             -
   c_pool/zfs01 creation              Wed Sep 2 12:36 2015 -
   c_pool/zfs01 used                  349M                   -
   c_pool/zfs01 available             675M                   -
   c_pool/zfs01 referenced            349M                   -
   c_pool/zfs01 compressratio         28.18x                 -
   c_pool/zfs01 mounted               yes                    -
   c_pool/zfs01 quota                 1G                     local
   c_pool/zfs01 reservation           none                   default
   c_pool/zfs01 recordsize            128K                   default
   c_pool/zfs01 mountpoint            /zfs01                 local
   c_pool/zfs01 sharenfs              on                     local
   c_pool/zfs01 checksum              on                     default
   c_pool/zfs01 compression           on                     local
   c_pool/zfs01 atime                 on                     default
   c_pool/zfs01 devices               on                     default
   c_pool/zfs01 exec                  on                     default
   c_pool/zfs01 setuid                on                     default
   c_pool/zfs01 readonly              off                    default
   c_pool/zfs01 zoned                 off                    default
   c_pool/zfs01 snapdir               hidden                 default
   c_pool/zfs01 aclinherit            restricted             default
   c_pool/zfs01 canmount              on                     default
   c_pool/zfs01 xattr                 on                     default
   c_pool/zfs01 copies                1                      default
   c_pool/zfs01 version               5                      -
   c_pool/zfs01 utf8only              off                    -
   c_pool/zfs01 normalization         none                   -
   c_pool/zfs01 casesensitivity       sensitive              -
   c_pool/zfs01 vscan                 off                    default
   c_pool/zfs01 nbmand                off                    default
   c_pool/zfs01 sharesmb              off                    default
   c_pool/zfs01 refquota              none                   default
   c_pool/zfs01 refreservation        none                   default
   c_pool/zfs01 primarycache          all                    default
   c_pool/zfs01 secondarycache        all                    default
   c_pool/zfs01 usedbysnapshots       0                      -
   c_pool/zfs01 usedbydataset         349M                   -
   c_pool/zfs01 usedbychildren        0                      -
   c_pool/zfs01 usedbyrefreservation 0                      -
   c_pool/zfs01 logbias               latency                default
   c_pool/zfs01 dedup                 off                    default
   c_pool/zfs01 mlslabel              none                   default
   c_pool/zfs01 sync                  standard               default
   c_pool/zfs01 refcompressratio      28.18x                 -

# Get one the properties (in this case, see if F.S. is NFS shareable)

zfs get sharenfs $ZPOOL/$ZFSFS
   NAME          PROPERTY VALUE     SOURCE
   c_pool/zfs01 sharenfs on        local

zfs get all $ZPOOL/$ZFSFS | grep sharenfs
   c_pool/zfs01 sharenfs              on                     local

# Change one of the properties (in this case, we make the F.S. not shareable)

zfs set sharenfs=off $ZPOOL/$ZFSFS

# Regarding the "sharenfs" property, we can make all zfs filesystems that have the property
# "on", automatically being exported. It persists over a reboot. We can run individual
# "zfs share" commands for specific filesystems (for this to work, obviously, nfs service
# must be started):
#
# zfs set sharenfs=on $ZPOOL/$ZFSFS
#
# zfs share -a    # or "zfs share $ZPOOL/$ZFSFS"
#
# showmount -e
#    Export list for <myserver>:
#    /zfs01 *

# Change F.S. mount point (obviously to carry out this operation F.S. shouldn't be in use)

MNTPT=newmnpt

zfs set mountpoint=/$MNTPT $ZPOOL/$ZFSFS

zfs list | grep $ZPOOL/$ZFSFS
   c_pool/zfs01   349M   675M   349M /newmnpt

zfs mount $ZPOOL/$ZFSFS    # alternatively run "zfs mount -a"

df -h /$MNTPT
   Filesystem            Size Used Avail Use% Mounted on
   c_pool/zfs01          1.0G 350M 675M 35% /newmnpt