This seems to have worked rather well! xfs_db now has much fewer errors, and can read SBs and AGFs, and xfs_repair can do something with it.
From here I did two things. I ran xfs_repair -L to purge the log, as I wasn't able to replay it (and some data loss is acceptable), and then I mounted the filesystem. This worked! Though it was now showing 22GB used, all in lost and found. Oops.
I noticed ag 0 reports a lot more free space than any of the others, so I tried copying sb 1 over sb 0 to get things to use the more intact blocks. No such luck yet, but I'm definitely getting some data. When I tried using sb 12, df shows 11T used (about right) but the file list is still very sparse.
So moving onward! Any recommendations from this point? I take it this is where I'd run xfs_irecover?
Aaron
On Tue, Nov 13, 2012 at 7:26 PM, Aaron Goulding <aarongldng@xxxxxxxxx> wrote:
Hmm.. Okay new plan. Running XFSB and XAGF scans on /dev/md0 instead of /dev/md1, and I'll use that to find the alignment the superblocks are expecting, and see if I have an offset wrong somewhere when I ran the multi-part DD onto /dev/md1. Barring this, I'll resort to xfs_irecover. I think you've given me a lot of information to go on though, so thank you greatly.
-AaronOn Sun, Nov 11, 2012 at 2:39 PM, Dave Chinner <david@xxxxxxxxxxxxx> wrote:
xfs_irecover:On Sat, Nov 10, 2012 at 11:08:23PM -0800, Aaron Goulding wrote:
> As I guessed, xfs_repair didn't work. xfs_db does now load with warnings,
> but I fear I don't know enough about that to properly use that tool. I've
> done a search for xfs_irepair but I'm finding very little from that. Where
> is that tool located? I'm understanding a full restore is very unlikely at
> this point, but if I can get anything, I'll consider this project a success
> and a learning experience. :)
http://oss.sgi.com/archives/xfs/2008-12/msg01782.html
current location:
http://inai.de/projects/hxtools/
You might need to hack it to recovery full files (ISTR is ignore
files larger than a certain size), but tools lke this are your best
bet now.
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