Re: Deleting old archives is slow

[Daniel Staal <DStaal@usa.net>]

--As of September 29, 2015 3:06:39 PM -0400, Garance AE Drosehn is alleged 
to have said:

> On Sep 29, 2015, at 2:31 PM, Tom Limoncelli <tal@whatexit.org> wrote:
>
> > On Mon, Sep 28, 2015 at 10:17 AM, James Turner <james@calminferno.net>
> > wrote:
> > > tarsnap -d -f archivename-2014010101 -f archivename-2014010102
> > > -f archivename-2014010103
> >
> > It is good to know that this works.  However it doesn't seem much
> > faster.  Also, I noticed that it fails the first time it hits a
> > non-existent archive, so restarting after a failure requires a binary
> > search or just reverting to doing them one at a time.
> >
> > tarsnap: Archive does not exist: archivename-2014010103
> > tarsnap: Error deleting archive
>
> I assume there isn't much you can do about how long it takes to delete
> each archive.  And you probably can't delete multiple archives at once
> (in parallel), because they all have to work on the same database of
> what data is still referenced by at least one of the remaining archives.
>
> So I suspect the best you can do is stack up the delete requests so
> you don't have to wait around for each one to finish before typing
> in the next one.  I spend so much time typing in command-lines that
> I would just type in a 'for' loop:

--As for the rest, it is mine.

It is slightly faster to have it all in one commandline - there's some 
repetitive overhead involved in doing it archive-by-archive, that tarsnap 
will avoid doing if it has the whole list.  (It also saves some data 
transfer - both on your network and on tarsnap.)

Daniel T. Staal

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