Re: btrfs recovery: What do the commands actually do?

[Martin <m_btrfs@ml1.co.uk>]

On 04/10/13 19:32, Duncan wrote:
> Martin posted on Fri, 04 Oct 2013 16:47:19 +0100 as "condensed":
> 
>> There's ad-hoc comment for various commands to recover from filesystem
>> errors.
>>
>> But what do they actually do and when should what command be used?
>> What do they do exactly and what are the indicators to try using them?
>> Or when should you 'give up' on a filsystem and just retrieve whatever
>> data can be read and start again?
>>
>> All that lot sounds good for a wiki page ;-)
> 
> I recognize your name so you're a regular poster and may well have seen

Hail fellow Gentoo-er ;-)


This is a prod from the thread:

http://article.gmane.org/gmane.comp.file-systems.btrfs/28775


> this recover steps/order post from Hugo Mills, but you didn't mention it, 
> so...
> 
> http://permalink.gmane.org/gmane.comp.file-systems.btrfs/27999
> 
> As you suggest, that should really go in the wiki (maybe it's there 
> already since that post, I haven't actually checked recently, but your 
> post reads as if you looked and couldn't find a recovery list of this 
> nature), but I've not gotten around to creating an account for myself 
> there yet and committing it, and if no one else has either...
> 
> But I do have it bookmarked for posting here, and for the day I do create 
> myself that wiki account, if no one else has gotten to it by then...
> 
> And while that answers what and what order, it doesn't cover what the 
> commands actually do or why you'd /use/ that order, and that'd be very 
> good to add as well.

Yep.

I'm using this as a bit of a test case as to how best to recover from
whatever inevitable hiccups.

All the more important to gain a good understanding before doing similar
things to 16TB arrays...


Comment/advice welcomed (please).

Thanks,
Martin