[volunteergrid2-l] Object Health

[Shawn Willden]

I think this is a question for tahoe-dev.

On Thu, Jul 5, 2012 at 4:15 PM, Brad Rupp <bradrupp at gmail.com> wrote:

> Greetings VG2 friends,
>
> I have a question about object health in Tahoe.  If I run two repairs, one
> right after another, the second repair quite often has unhealthy objects.
>  I have not backed up any files to the grid between these two repairs.  I
> would expect the second repair to not have any unhealthy objects.
>
> I am running the following command:
>
> ~/tahoe/bin/tahoe deep-check --repair --verbose my-alias:
>
> The output from repair #1:
>
> repair successful
> done: 11801 objects checked
>  pre-repair: 11725 healthy, 76 unhealthy
>  76 repairs attempted, 76 successful, 0 failed
>  post-repair: 11801 healthy, 0 unhealthy
>
> The output from repair #2:
> done: 11801 objects checked
>  pre-repair: 11789 healthy, 12 unhealthy
>  12 repairs attempted, 11 successful, 1 failed
>  post-repair: 11800 healthy, 1 unhealthy
>
> As you can see, the first repair found and fixed 76 unhealthy objects. The
> second repair, approximately 12 hours later, found 12 unhealthy objects and
> fixed 11 of them.
>
> Why would the second repair find 12 unhealthy objects?  I would have
> expected it to find 0 unhealthy objects given that the first repair was
> performed only 12 hours earlier.
>
> This is just one repair run out of many.  I can consistently get similar
> results.  I guess the deeper question is are the objects stored in Tahoe
> safe?  Or when I really need them due to a catastrophic event will I lose a
> handful of objects due to this?
>
> Regards,
>
> Brad
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-- 
Shawn
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