I stopped my array, changed the number of array devices to 12 and then changed cache devices to 4.

 

The admin page is stuck at "Mounting disks..."

 

I see in the syslog:

 

Jan 11 07:58:45 arwen emhttp: shcmd (169): mkdir -p /mnt/cache

Jan 11 07:58:45 arwen emhttp: mount error: No file system (no btrfs UUID)

Jan 11 07:58:45 arwen emhttp: shcmd (170): rmdir /mnt/cache

Jan 11 07:58:45 arwen emhttp: shcmd (171): sync

Jan 11 07:58:45 arwen emhttp: shcmd (172): mkdir /mnt/user0

Jan 11 07:58:45 arwen emhttp: shcmd (173): /usr/local/sbin/shfs /mnt/user0 -disks 1022 -o noatime,big_writes,allow_other  |& logger

Jan 11 07:58:45 arwen emhttp: shcmd (174): mkdir /mnt/user

Jan 11 07:58:45 arwen emhttp: shcmd (175): /usr/local/sbin/shfs /mnt/user -disks 1023 2048000000 -o noatime,big_writes,allow_other -o remember=0  |& logger

Jan 11 07:58:45 arwen emhttp: shcmd (176): cat - > /boot/config/plugins/dynamix/mover.cron <<< "# Generated mover schedule:#01230 0 * * * /usr/local/sbin/mover |& logger#012"

Jan 11 07:58:45 arwen emhttp: shcmd (177): /usr/local/sbin/update_cron &> /dev/null

 

So what now?

Update your sig

Ok, done...

My cache drive is xfs, so why is it complaining about btrfs?

 

This cache drive was once btrfs, but that was months and months ago.

 

I think this may be a bug?

If you change the number of cache slots then it expects btrfs formatted disks so you would need to format the cache or change the slots back to 1.

I can't change the slots back to 1... emhttpd is hung up

You can try powerdown from the command line, or just power off if that doesn't work.

 

Edit config/disk.cfg on your flash so the array won't autostart then you should be able to change it.

Ok, it is back.

 

I had to edit disk.cfg to not start the array automatically and then edit the cache fs type back to xfs.

 

This is definitely something that should be addressed in the UI.  I shouldn't be able to change the config such that the UI is locked up.