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From Alex P <apede...@kolosy.com>
Subject Re: couch behavior for san snapshots
Date Mon, 19 Oct 2009 19:35:28 GMT
cdb catalogs databases purely on file name and presence in the appropriate
directory, right? so if i copy db1 to db1_copy, i should see db1_copy show
up in futon?

On Mon, Oct 19, 2009 at 2:23 PM, Paul Davis <paul.joseph.davis@gmail.com>wrote:

> On Mon, Oct 19, 2009 at 3:18 PM, Alex P <apedenko@kolosy.com> wrote:
> > hello,
> >
> > we ran into an issue this weekend where taking a SAN (amazon ebs)
> snapshot
> > of a couchdb mount somehow brought over only part of the data.
> specifically,
> > there were two small dbs (call them db1 and db2) on the couch instance,
> each
> > with several hundred documents. taking the snapshot and bringing it up
> again
> > showed both databases, but one had 0 documents and an update sequence of
> 0.
> > the instance the snapshot was taken from still has both databases showing
> > with several hundred databases. we repeated this process several times,
> with
> > the same effect, on the same db.
> >
> > any thoughts would be much appreciated, as we are about to go live, and
> not
> > being able to do a backup of our db is ... disturbing.
> >
> > thanks,
> > alex.
> >
>
> Alex,
>
> That's most odd. What happens if you try and cp the database file to a
> new name? Something like:
>
> $ cp /usr/local/var/lib/couchdb/db1.couch
> /usr/local/var/lib/couchdb/db3.couch
>
> Another thing to try would be:
>
> $ curl -X POST http://127.0.0.1:5984/db1/_ensure_full_commit
>
> And then try to snapshot or copy again. I highly doubt that POST would
> affect anything, but it might be worth a shot.
>
> Paul Davis
>

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