Re: HAMMER cleanup

[Sascha Wildner <saw@xxxxxxxxx>]

Thomas Nikolajsen schrieb:
> When / how do we prefer to run HAMMER cleanup?
>
> My thoughts:
>
> It is important to cleanup HAMMER file systems regularly,
> to get snapshots generated and prune & reblock so
> file system doesn't get too fragment or fill up.
>
> This should be done by default; this way users will
> only get minimal extra administration tasks by using HAMMER.
>
> Default action: `hammer cleanup';
> with ability to specify other command.
>
> command should, just like `hammer snapshot',
> snapshot, prune & reblock all HAMMER file systems, including PFS.
>
>  - periodic/daily
> Executes in the night (starts 3:01 AM).
> Cleanup by default; ability to disable (periodic.conf).
> Fine for servers running 24h a day; not good for systems turned off at night.
> Maybe periodic/monthly should also be used, so extended cleanup won't give disk trashing.
>
>  - rc.d/hammer_cleanup
> Executes at boot time.
> Cleanup by default; ability to disable (rc.conf).
> Fine for systems turned off at night.
>
> I see no problem by enabling cleanup in both rc.d and periodic by default,
> as `hammer cleanup' is a no op. if executed more than once a day.
>
> If users want snapshot more often (eg. every hour), a cron script can do that,
> this is very light weight to generate; normally it will normally be enough to
> prune & reblock file system once a day.
>
> I can make scripts for this, when we agree on what we want.

I fully agree and had talked to Matt about this in IRC.

See the patch for periodic at 
http://leaf.dragonflybsd.org/~swildner/hammer_periodic.diff. If no one 
objects, I'll commit within the next few days.

About the rc script: I'm not sure because for a machine which was turned 
off for a longer time this (if enabled by default) would make booting 
take a rather long time.

Sascha

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