I am running Stable UnRaid 7.1.4 and my system is not starting up. It boots but when I tell

it to start the array it doesn't want to startup. It looks like it is trying to mount

the cache drives. It has been stuck with the zfs Mounting message for a couple of days.

Device Identification Temp Reads Writes Errors FS Size Used Free

Cache CT1000MX500SSD1_2434E988D1A5 - 1 TB (sdc) 33 °C 0.0 B/s 0.0 B/s 0 zfs Mounting

Cache 2 CT1000MX500SSD1_2434E988D1A7 - 1 TB (sdg) 26 °C 0.0 B/s 0.0 B/s 0

Pool of two devices 30 °C 0.0 B/s 0.0 B/s 0

at the bottom of the page I have:

Array Starting•Mounting disks...

If I try and display my VMs I get "Array must be started to view Virtual Machines."

and from the Docker page I get "Array must be Started to view Docker containers."

None of my Shares are showing up when I click on it.

The Plugins are displaying correctly.

My Stats page is showing that the 3 x 4TB drives are 100% full, but from the command line (ssh conection) it shows

they are at 51% 48% and 1% full. I have a 4TB Parity drive configured.

If I try to start a console using the >_ button, I get colorful garbage with no way to interact

with the shell.

I did just replace my system memory, since the memtest86 was showing a bunch of errors. (bumped

from 32Gb to 64Gb).

I ran "Fix common problems" and it is showing:

Errors Found Suggested Fix

cache2 (CT1000MX500SSD1_2434E988D1A7) is disabled Begin Investigation Here: "Unraid Main"

cache (CT1000MX500SSD1_2434E988D1A5) has file system errors () If the disk if XFS / REISERFS,

stop the array, restart the Array in Maintenance mode, and run the file system checks. If the

disk is BTRFS, then see this post (https://forums.unraid.net/topic/46802-faq-for-unraid-v6/page/2/?tab=comments#comment-543490). If the disk is listed as being unmountable, and it has data

on it, whatever you do do not hit the format button. Seek assistance HERE (https://forums.unraid.net/forum/55-general-support/)

My cache is setup as a ZFS file system.

ZFS Master is not showing any pools.

I tried running "zpool scrub cache" and it ran for multiple days without completing.

I have attached the diagnostics file below.

I am not sure of what to try next. I would like to keep my data drives intact.

tower-diagnostics-20250630-0051.zip

Jun 27 22:47:58 Tower kernel: WARNING: Pool 'cache' has encountered an uncorrectable I/O failure and has been suspended.

Also, this:

Jun 27 22:47:53 Tower emhttpd: pool: disk3

Jun 27 22:47:53 Tower emhttpd: state: ONLINE

Jun 27 22:47:53 Tower emhttpd: status: One or more devices has experienced an error resulting in data

Jun 27 22:47:53 Tower emhttpd: corruption. Applications may be affected.

Start by running memtest, if nothing is found, see if the pool mounts read-only, disable array auto-start, reboot, then type zpool import -o readonly=on cache

P.S. after a zfs pool has been suspended, you will need to force a reboot, won't be able to do a normal one.

Passed the memtest. Was able to mount the cache and disk3 readolny. Rebooted and had the same issues. When I ran "zpool status -v" i got a few Permanent errors on both the cache and disk3:zpool.log

If they mount read-only, you can try and copy the data to other disks/pools, then reformat those.

Everything is working again. Copying the data to a different disk and reformatting did the trick.

Thanks for the help.