Hello all,

please advise on the following issue.

I renamed the share from 'TV Shows' to 'TV_Shows', as Unraid did not accept the space as a character in the name. I created it years ago and it was accepted.

The share is located in the disk2 (sdf), formatted as zfs in the classical array.

Now the disk get 100% load from reading and I could finish the parity check only after switching to 'Maintenance mode', otherwise it would last months.

I tried to localize the problem with chatGPT and ran in the terminal
I am new to ZFS and formatted the replaced disks in the array recently. PLease advise how can I repair / correct the dataset

tail -n 200 /var/log/syslog | egrep -i 'sdf|disk2|md|mdadm|parity|mover|error|retry'

Jun 5 13:15:53 koaly-tower emhttpd: shcmd (2931): /etc/rc.d/rc.samba reload

Jun 5 13:15:54 koaly-tower emhttpd: shcmd (2934): exportfs -ra

Jun 5 13:15:54 koaly-tower emhttpd: shcmd (2936): /etc/rc.d/rc.avahidaemon reload

Jun 5 13:15:59 koaly-tower emhttpd: shcmd (2951): rmdir '/mnt/user/TV Shows'

Jun 5 13:15:59 koaly-tower shfs: /usr/sbin/zfs unmount 'disk2/TV Shows' 2>&1

Jun 5 13:15:59 koaly-tower shfs: cannot open 'disk2/TV Shows': dataset does not exist

Jun 5 13:16:00 koaly-tower emhttpd: shcmd (2969): /etc/rc.d/rc.samba reload

Jun 5 13:16:00 koaly-tower emhttpd: shcmd (2972): exportfs -ra

Jun 5 13:16:00 koaly-tower emhttpd: shcmd (2974): /etc/rc.d/rc.avahidaemon reload

Edited June 5Jun 5 by koaly

Please post diagnostics

3 minutes ago, MowMdown said:

Please post diagnostics

Here it is. Thank you in advance!

koaly-tower-diagnostics-20260605-1435.zip

Does this behavior occur when you start the system in "Safe Mode" from the boot menu?

Edit: It appears you have a zfs scrub running on disk2, this reads from the entire disk similar to how a parity check works.

sr/sbin/zpool status -P disk2 2>&1
Jun  5 12:04:29 koaly-tower emhttpd:   pool: disk2
Jun  5 12:04:29 koaly-tower emhttpd:  state: ONLINE
Jun  5 12:04:29 koaly-tower emhttpd:   scan: scrub in progress since Mon Jun  1 00:00:10 2026
Jun  5 12:04:29 koaly-tower emhttpd: 	7.34T / 9.10T scanned at 21.9G/s, 6.87T / 9.10T issued
Jun  5 12:04:29 koaly-tower emhttpd: 	0B repaired, 75.55% done, no estimated completion time

Edited June 5Jun 5 by MowMdown

2 minutes ago, MowMdown said:

Does this behavior occur when you start the system in "Safe Mode" from the boot menu?

Edit: It appears you have a zfs scrub running on disk2

sr/sbin/zpool status -P disk2 2>&1
Jun  5 12:04:29 koaly-tower emhttpd:   pool: disk2
Jun  5 12:04:29 koaly-tower emhttpd:  state: ONLINE
Jun  5 12:04:29 koaly-tower emhttpd:   scan: scrub in progress since Mon Jun  1 00:00:10 2026
Jun  5 12:04:29 koaly-tower emhttpd: 	7.34T / 9.10T scanned at 21.9G/s, 6.87T / 9.10T issued
Jun  5 12:04:29 koaly-tower emhttpd: 	0B repaired, 75.55% done, no estimated completion time
Jun  5 12:04:29 koaly-tower emhttpd: config:
Jun  5 12:04:29 koaly-tower emhttpd: 	NAME          STATE     READ WRITE CKSUM
Jun  5 12:04:29 koaly-tower emhttpd: 	disk2         ONLINE       0     0     0
Jun  5 12:04:29 koaly-tower emhttpd: 	  /dev/md2p1  ONLINE       0     0     0

Yes, safe mode and docker disabled led to the same issue. How can I stop this zfs scrub?

click on "disk2" and pause the scrub, you ideally do not want to run a zfs pool scrub at the same time as a parity check/sync

Edited June 5Jun 5 by MowMdown

1 minute ago, MowMdown said:

click on "disk2" and pause the scrub, you ideally do not want to run a zfs pool scrub at the same time as a parity check/sync

Worked! many thanks. How much time this scrub action may run? I did not start it actually and do not have any schedule for it. How it could start by itself?

My guess is one of your plugins you've installed.

I see one called "Scrubber" which might be the source of this.

It could also be one of your user-scripts.

Edited June 5Jun 5 by MowMdown

3 minutes ago, MowMdown said:

My guess is one of your plugins you've installed.

I see one called "Scrubber" which might be the source of this.

I have only BTRFS Scrubber plugin, which I think has nothing to do with ZFS Scrub.

ZFS Master plugin does not have UI at least I do not see it as I have no ZFS pools.

Edited June 5Jun 5 by koaly