[Gluster-devel] Selfheal is not working? Once more

[Raghavendra G]

Hi,

Can you do a _find . | xargs touch_ and check whether brick A is
self-healed?

regards,

On Thu, Jul 31, 2008 at 4:07 AM, Łukasz Osipiuk <lukasz at osipiuk.net> wrote:

> Thanks for answers :)
>
> On Wed, Jul 30, 2008 at 8:52 PM, Martin Fick <mogulguy at yahoo.com> wrote:
> > --- On Wed, 7/30/08, Łukasz Osipiuk <lukasz at osipiuk.net> wrote:
> >
>
> [cut]
>
> >> The more extreme example is: on of data bricks explodes and
> >> You replace it with new one, configured as one which gone off
> >> but with empty HD. This is the same as above
> >> experiment but all data is gone, not just one file.
> >
> > AFR should actually handle this case fine.  When you install
> > a new brick and it is empty, there will be no metadata for
> > any files or directories on it so it will self(lazy) heal.
> > The problem that you described above occurs because you have
> > metadata saying that your files (directory actually) is
> > up to date, but the directory is not since it was modified
> > manually under the hood.  AFR cannot detect this (yet), it
> > trusts its metadata.
>
> Well, either I am doing something terribly wrong or it does not handle
> this case fine.
> I have following configuration.
> 6 bricks: A, B, C, D, E, F
> On client I do
> IO-CACHE(
>  IO-THREADS(
>    WRITE-BEHIND
>      READ_AHEAD(
>        UNIFY(
>          DATA(AFR(A,B), AFR(C,D)), NS(AFR(E,F)
>        )
>      )
>    )
>  )
> )
>
> I do:
> 1. mount glusterfs on client
> 2. on client create few files/directories on mounted glusterfs
> 3. shutdown brick A
> 4. delete and recreate brick A local directory
> 5. startup brick A
> 6. on client access all files in mounted glusterfs directory.
>
> After such procedure no files/directories appear in local brick A
> directory? Should they or I am missing something?
>
>
> I think the file checksuming you described is overkill for my needs.
> I think I will know if one of my HD drives brakes down and I will
> replace it, but I need to workaround problem  with data recreation
> described above.
>
>
> --
> Łukasz Osipiuk
> mailto: lukasz at osipiuk.net
>
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>
>


-- 
Raghavendra G

A centipede was happy quite, until a toad in fun,
Said, "Prey, which leg comes after which?",
This raised his doubts to such a pitch,
He fell flat into the ditch,
Not knowing how to run.
-Anonymous