Primary Server down

Justin Sherrill justin at
Sun Oct 11 19:35:04 PDT 2015

If redo fails, you can set a tunable:


     0       Run redo recovery normally and fail to mount in the case of
     1       Run redo recovery but continue mounting if an error appears.
     2       Completely bypass redo recovery.

I assume you'd want 2, and then immediately copy your data to a filesystem
you can trust on another machine.  I don't know what's up with that
machine, but take no chances.

There is a 'hammer recover' command (see man 8 hammer), to use as a
last-ditch effort.  I've never tried it.

On Sat, Oct 10, 2015 at 7:29 PM, Konrad Neuwirth <konrad at> wrote:

> Dear reader,
> our primary server just rebooted and has somehow shot itself into the
> hammer filesystem while doing so.
> It can’t mount hammer because undo/redo recovery doesn’t work.
> I can only access the machine via its console card, so I can’t copy &
> paste text contents, but what I see is:
> So I can mount read-only, but it doesn’t work so well for read-write.
> I need the data on that filesystem. If one or two files are a problem,
> that’s not tough.
> What could I do?
> Thank you,
>  Konrad
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