Short version: I had a bad SMART readings on my cache 500GB SSD (A-drive), and decided to replace both drives with 1TB drives. I replaced the bad drive with a new one, and the pool (apparently) rebuilded. But when I replaced the second drive (B-drive) the result was “Unmountable: Too many missing/misplaced device” on both drives. I managed to return to working pool by replacing the second original drive (B) back [1]. But now, after a lot of fiddling around with the old and new cache drives (yeah, right… bad move) I have “Unmountable: No pool uuid” on both of the old drives in place. Am I foobar? Long version: After I got the pool working [1, above] I decided to play safe and try moving everything to array first. The mover did not move everything, I’d say that VM’s and Docker did not move (yes, they were shutdown and unenabled in settings). I tried copying the content of cache to a backup-share with Dynamix file manager. I let it run overnight, but when I went to bed it copying status was like 120% and growing?? That copy process did not work, all of cache was still not copied (when comparing Calculate Occupied space). I then tried using MC, straight to disk where Mover had moved some files, but it stalled on several VM-images and there was also some errors (didn’t record the error, silly me). At this stage I still had a working cache pool by using both of the original drives. I then cleared both partition tables of the 1TB disks with gparted on a linux machine , and I then tried the way of the FAQ to replace the drives. I put one new disk to a spare sata port and assigned it to cache to but received “Unmountable: Too many missing/misplaced device” straight away. I then tried clearing the cache config, changing different drive combinations (but always keeping old A & B-drives in their respective slots). Nothing worked, either I got “too many missing..” or “No pool uuid”. And now I have both of the old cache drives in place with “Unmountable: No pool uuid”. How screwed am I? I do have recent backups of everything (appdata, docker.img, VM’s), should I just give in, restore from those, or can the cache be saved? ziggy-nas-diagnostics-20230714-1326.zip

Problem replacing cache pool drives

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July 18, 20232 yr

Community Expert
Solution

5 minutes ago, hawgorn said:

For future reference and as I'd like to learn a bit, what might be causing this log tree issue

Except for some hardware issue like bad RAM or firmware don't know of any direct causes, possibly an unclean shutdown also.

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July 20, 20232 yr

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Five minutes into Memtest produced 7 rows of errors.

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July 20, 20232 yr

Community Expert

3 hours ago, hawgorn said:

Five minutes into Memtest produced 7 rows of errors.

Since even 1 error is a problem then I guess you have identified a probable cause of your issues.

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