Rob, That second drive was immediately put to use elsewhere. I figured
having only the metadata on that drive, it wouldn't matter. The data
stayed single and wasn't part of the second drive, only the metadata
was. I must not be capable of understanding why that wouldn't work.
I thought all I was doing was removing a duplication of metadata and the
worst I would see is a message complaining about a drive missing. Never
thought the data or access to it could be compromised in what seemed to
be a simple situation.
Anand, I get the same output with mount -o recovery,ro.
On 10/29/2014 7:07 PM, Robert White wrote:
On 10/29/2014 03:26 PM, Robert White wrote:
On 10/28/2014 01:32 PM, Zack Coffey wrote:
Made a RAID1 with another drive of just the metadata. Was in
that state for less than 12 hours-ish, removed the second drive and
now cannot get to any data on the original drive. Data remained single
while only metadata was RAID1.
I don't know all the details but I would _never_ suspect the action you
described to _not_ hose up the file system.
You need to put the second drive back in and then coerce all the data
back to the first drive. "btrfs device delete" is what you want. You
_may_ need to switch the metadata back to "single" before the delete.
--Rob.
P.S. I am/was assuming you said "removed the second drive" in the
normal sense of disconnecting and removing, as opposed to the semantic
action of deleting the device element.
If you did do the btrfs delete, you might have needed to do a "btrfs
filesystem sync" to make sure that all the transactions involved in
the delete were finished and flushed to disk.
Either way, physically reattaching "the second drive" is your first
step; presuming again that you haven't destroyed the partition or
re-used the drive etc. If the partition will mount once the second
drive is in place, do the delete operation (if you didn't) and then
the sync (to make sure that everything has finished migrating etc).
Then you should be able to re-remove the physical drive.
If you already did the delete and sync as part of what you meant by
"remove" then sorry for the interruption of your misery. 8-)
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