BTRFS Cache Pool (2x480GB Sandisk SSD) Unmountable

[htpcguru]

It has happened before.  After a power-cycle/SSD re-seat, the cache pool came back alright.  Just now one of the Windows 10 VM prompted an updated, which caused a crash of another running Windows 10 VM.  After a "forced" reboot of unraid, the cache pool came back unmountable.

 

It has happened before... power-cycling the box and re-seating the 2 SSD's fixed the issue.

 

Any help is appreciated!

 

tower-diagnostics-20170914-2105.zip (Cache pool good)

tower-diagnostics-20170924-1601.zip (Cache pool unmountable)

[JorgeB]

Lots of read and writes errors on one of your cache devices (cache2):

 

Sep 24 16:01:11 Tower kernel: BTRFS error (device sdc1): bdev /dev/sdc1 errs: wr 38, rd 8855, flush 1, corrupt 0, gen 0

wr=write errors

rd=read errors

 

These are hardware errors, with SSDs this is usually a bad cable, replace it.

[htpcguru]

15 hours ago, johnnie.black said:

Lots of read and writes errors on one of your cache devices (cache2):

 

Sep 24 16:01:11 Tower kernel: BTRFS error (device sdc1): bdev /dev/sdc1 errs: wr 38, rd 8855, flush 1, corrupt 0, gen 0

wr=write errors

rd=read errors

 

These are hardware errors, with SSDs this is usually a bad cable, replace it.

Thanks for the tip.  I replaced the cable AND moved cache2 to another SATA port on the motherboard as the new cable had the same issue.  Had to re-install one of the Windows 10 VM's.

 

The original ports are SATA1_2 (with 2 being on top of 1), cache1 still in SATA1, and now I've moved cache2 to SATA3 of SATA3_4.  Not sure if SATA2 was the culprit.  It's also possible the cache2 SSD could have some H/W issue.