Speaking of bcache integrity...This morning, bcache started indicating
that it was encountering errors writing to the drive. 

For some stupid reason, I rebooted, and on boot, it cannot find the
volume group (I was running LVM on bcache) that my root fs is on,
finally dropping to the initramfs shell.

I then find that attempting to register my bcache component devices
fails:

(initramfs) echo /dev/sdb1 > /sys/fs/bcache/register
sh: write error: invalid argument
(initramfs) ls /sys/fs/bcache/
register         register_quiet

This happens for both the cache device and the backing store. I realize
that collecting information prior to a reboot would have been much more
useful...sorry. 

Is there any simple reason why I would be seeing this behavior? I assume
that either both devices are corrupt, and no longer seen as bcache
formatted devices. Does that seem likely?

-davidc




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