Re: [BackupPC-users] The one-at-a-time nightly problem, debugged; DEVS PLEASE READ; long.
2010-11-30 17:47:55
On Tue, Nov 30, 2010 at 03:18:46PM -0500, Timothy J Massey wrote:
> Robin Lee Powell <rlpowell AT digitalkingdom DOT org> wrote on 11/25/2010
> 01:12:50 PM:
>
> > The problem is that calling "BackupPC_serverMesg
> > BackupPC_nightly run" when the regular nightlies are already
> > running, or calling it twice in quick succession, doesn't result
> > in the scheduler restarting the nightlies run from scratch
> > (GOOD) or queuing up a second nightlies run when the first
> > finishes (not great, but OK), it results in the scheduler eating
> > its own face (BAD).
>
> Given your use case (free up space immediately), your "GOOD" and
> "not great" options are effectively identical. The extant nightly
> will be some random amount through its process when you submit the
> second nightly. It will then free up the space for the remaining
> amount of the pool. Once it finishes and starts a new nightly,
> the new nightly will start at the beginning of the pool and make
> its way through it, freeing up the part that the existing one
> missed.
But it will take a lot longer.
> The only part of the process that is wasted when you run the
> nightly twice is the part where the second nightly job covers the
> part of the pool that was already processed by the first one after
> you submitted the second nightly job. Restarting the nightly job
> from scratch will not change the amount of time that it takes to
> free up your disk space--not one instant. It will, however, cause
> the nightly job to process some of your pool twice, *after* the
> disk space is freed up.
Yeah, and the hosts can barely keep up with the backups required of
them as it is; I need that time.
But I understand your point, and had missed it before; thanks.
-Robin
--
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