Alexander Fougner posted on Sat, 30 Apr 2016 12:28:34 +0200 as excerpted:

>>>> Do scrub and btrfs check (no repair) complete without errors?
> 
> Send side
> 
> sudo btrfs check /dev/sda1
> Checking filesystem on /dev/sda1

[... but no errors]

> Receive side only outputs this:
> sudo btrfs check -p /dev/sdc
> Couldn't open file system

It wasn't mounted at the time, right?

Cuz btrfs check won't work with a mounted filesystem.

Of course you'll need to be root to access the device as well,
but that's pretty much a given.


> Scrub completes without errors on both FS.

That's good. =:^)

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

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