ZFS pool size (Re: else or Debian)

[DdB <debianlist@potentially-spam.de-bruyn.de>]

Am 10.11.2022 um 14:28 schrieb DdB:
> Take some time to
> play with an installation (in a vm or just with a file based pool should
> be considered).

an example to show, that is is possible to allocate hugefiles (bigger
than a single disk size) from a pool:

> datakanja@PBuster-NFox:~$ mkdir disks
> datakanja@PBuster-NFox:~$ cd disks/
> datakanja@PBuster-NFox:~/disks$ seq  -w 0 15 | xargs -i truncate -s 4T disk{}.bin # this creates sparse files to act as virtual disks
> datakanja@PBuster-NFox:~/disks$ zpool create TEST raidz3 ~/disks/d*
> datakanja@PBuster-NFox:~/disks$ zpool list
> NAME   SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP    HEALTH  ALTROOT
> TEST  64.0T   314K  64.0T        -         -     0%     0%  1.00x    ONLINE  -
16*4 TB = 64 TB size
> datakanja@PBuster-NFox:~/disks$ zfs list TEST
> NAME   USED  AVAIL     REFER  MOUNTPOINT
> TEST   254K  50.1T     64.7K  /TEST
# due to redundacy in the pool, the maximum size of a file is slightly
over 50TB

#do not forget to clean up (destroying pool and files)