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
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