On Sat, Jan 30, 2021 at 1:59 AM Patrick Bihlmayer <p.bihlma...@gmx.net> wrote: > > Hello together, > > today i had an issue with my cache drive on my Unraid Server. > I used a 500GB SSD as cache drive. > > Unfortunately i added another cache drive (wanted a separate drive for my VMs > and accidentally added into the cache device pool) > After starting the array and all the setup for the cache device pool was done > i stopped the array again. > I removed the second drive from my cache device pool again. > > I started the array again - formatted the removed drive mounted it with > unassigned devices.# > And then i realized the following error in my Unraid Cache Devices > > > > Unfortunately i cannot mount it again. > Can you please help me?
I don't know anything about unraid. The attached dmesg contains: [ 3660.395013] BTRFS info (device sdb1): allowing degraded mounts [ 3660.395014] BTRFS info (device sdb1): disk space caching is enabled [ 3660.395014] BTRFS info (device sdb1): has skinny extents [ 3660.395733] BTRFS error (device sdb1): failed to read chunk root [ 3660.404212] BTRFS error (device sdb1): open_ctree failed Is that sdb1 device part of the unraid? Is there a device missing? The 'allowing degraded mounts' message along with 'open_ctree failed' suggests that there's still too many devices missing. I suggest a relatively recent btrfs-progs, 5.7 or higher, and provide the output from: btrfs insp dump-s /dev/sdb1 -- Chris Murphy
