[SOLVED] ZFS: enable thin provisioning

[Valerio Pachera]

Hi all, I'm managing a proxmox 5.1-43 server.
I was not the one who installed it.
It has two main zfs volumes.

zpool iostat
              capacity     operations     bandwidth
pool        alloc   free   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
rpool       9.99G   918G      0     22  13.9K   263K
storage      259G   629G     37     37   424K   839K
storage2     406G  1.42T     20      4   995K   169K
----------  -----  -----  -----  -----  -----  -----

"storage" is on ssd.
I noticed the flag Thin provisioning is note set.



I guess this way, if I set 'discard' option on a guest, it's not going to work.

Is it possible to eneable now?
Shall I shut down guests before doing that?
Are you aware of other bad conseguences?

Thank you.

 

[LnxBil]

Just enable it, it'll be used for all new datasets.

For already created ones, just reset the ZFS property refreservation:

root@proxmox4 ~ > zfs list rpool/data/vm-100-disk-1
NAME                       USED  AVAIL  REFER  MOUNTPOINT
rpool/data/vm-100-disk-1   132G   832G    64K  -

root@proxmox4 ~ > zfs get all rpool/data/vm-100-disk-1
NAME                      PROPERTY              VALUE                 SOURCE
rpool/data/vm-100-disk-1  type                  volume                -
rpool/data/vm-100-disk-1  creation              Mi Feb 21 13:29 2018  -
rpool/data/vm-100-disk-1  used                  132G                  -
rpool/data/vm-100-disk-1  available             832G                  -
rpool/data/vm-100-disk-1  referenced            64K                   -
rpool/data/vm-100-disk-1  compressratio         1.00x                 -
rpool/data/vm-100-disk-1  reservation           none                  default
rpool/data/vm-100-disk-1  volsize               128G                  local
rpool/data/vm-100-disk-1  volblocksize          8K                    -
rpool/data/vm-100-disk-1  checksum              on                    default
rpool/data/vm-100-disk-1  compression           lz4                   inherited from rpool
rpool/data/vm-100-disk-1  readonly              off                   default
rpool/data/vm-100-disk-1  copies                1                     default
rpool/data/vm-100-disk-1  refreservation        132G                  local
rpool/data/vm-100-disk-1  primarycache          all                   default
rpool/data/vm-100-disk-1  secondarycache        all                   default
rpool/data/vm-100-disk-1  usedbysnapshots       0                     -
rpool/data/vm-100-disk-1  usedbydataset         64K                   -
rpool/data/vm-100-disk-1  usedbychildren        0                     -
rpool/data/vm-100-disk-1  usedbyrefreservation  132G                  -
rpool/data/vm-100-disk-1  logbias               latency               default
rpool/data/vm-100-disk-1  dedup                 off                   default
rpool/data/vm-100-disk-1  mlslabel              none                  default
rpool/data/vm-100-disk-1  sync                  standard              inherited from rpool
rpool/data/vm-100-disk-1  refcompressratio      1.00x                 -
rpool/data/vm-100-disk-1  written               64K                   -
rpool/data/vm-100-disk-1  logicalused           30K                   -
rpool/data/vm-100-disk-1  logicalreferenced     30K                   -
rpool/data/vm-100-disk-1  snapshot_limit        none                  default
rpool/data/vm-100-disk-1  snapshot_count        none                  default
rpool/data/vm-100-disk-1  snapdev               hidden                default
rpool/data/vm-100-disk-1  context               none                  default
rpool/data/vm-100-disk-1  fscontext             none                  default
rpool/data/vm-100-disk-1  defcontext            none                  default
rpool/data/vm-100-disk-1  rootcontext           none                  default
rpool/data/vm-100-disk-1  redundant_metadata    all                   default

root@proxmox4 ~ > zfs set refreservation=none rpool/data/vm-100-disk-1

root@proxmox4 ~ > zfs list rpool/data/vm-100-disk-1
NAME                       USED  AVAIL  REFER  MOUNTPOINT
rpool/data/vm-100-disk-1    64K   832G    64K  -

 

[Valerio Pachera]

Thank you

 

[reinthal]

hell yes! Saved my butt today. Thank you sorry for necro.