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I am currently building a media server based on Linux Mint. The OS is installed on a small SSD and the intention is to store the media files on two HDDs (2TB + 4TB). To this end I have created a zfs pool called zstorage from the two HDDs. Then I added to this pool a dataset called movies. I have set the mountpoint to /home/gs/movies.

The output from zfs list appears to confirm this was created.

gs@Odin:~ > sudo zfs list NAME USED AVAIL REFER MOUNTPOINT zstorage 118K 5.35T 21K /zstorage zstorage/movies 21K 5.35T 21K /home/gs/movies

However when I try to copy files to the location /home/gs/movies the space on the SSD is being consumed and the files are not being stored on the HDDs that the zfs pool and dataset have been created.

Can anyone give shed some light on this?

Output from df

gs@Odin:~ > df -h Filesystem Size Used Avail Use% Mounted on udev 3.9G 12K 3.9G 1% /dev tmpfs 788M 1.5M 786M 1% /run /dev/dm-0 102G 87G 9.7G 90% / none 4.0K 0 4.0K 0% /sys/fs/cgroup none 5.0M 0 5.0M 0% /run/lock none 3.9G 80K 3.9G 1% /run/shm none 100M 20K 100M 1% /run/user /dev/sda2 237M 51M 174M 23% /boot /dev/sda1 511M 3.4M 508M 1% /boot/efi zstorage 5.4T 21K 5.4T 1% /zstorage

Output from zpool list

gs@Odin:~ > sudo zpool status pool: zstorage state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM zstorage ONLINE 0 0 0 sdb ONLINE 0 0 0 sdc ONLINE 0 0 0 errors: No known data errors
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  • Just so you know, you didn't configure any RAID protection across your disks. If one drive fails, you will lose zstorage. Commented Jun 21, 2016 at 15:59
  • Thanks @ewwhite, that is a deliberate choice. None of files I will be storing will be critical or couldn't be recovered elsewhere. I prioritised space over the risk of data loss Commented Jun 21, 2016 at 21:02

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I have fixed this issue, but the resolution is unsatisfactory. However, I post it here incase it helps anyone else.

It appears that the dataset was never successfully mounted. This is apparent from the df listing. I tried mounting the drive manually using sudo zfs mount -v zstorage/movies

This for reasons I cannot discern took about 5 minutes to complete. There seemed to be no messages in dmesg and I also used the verbose flag (-v) so I could see what was happening, but there were no indications.

After the command had successfully returned. The dataset had mounted to the mountpoint as expected and df shows the mount with the full storage available.

TLDR;

enter command:

sudo zfs mount -av

wait for a long time for it to complete

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