Hello,
2015-05-21 17:23 GMT+02:00 Devin Reade <g...@gno.org>:
>
> On that note, I've traditionally gone with volume sizes in the ~500MB
> (2^29)
> range (for disk stores), but in this case that can push the volume
> count in the catalog to more than 512k entries once a minimum number
> of offsite copies have been made. Have you seen installations with that
> many volumes?
Why do you need to use a 500MB volume in size? This days it is like
distributing movies on floppies instead of DVD/BR.
It shouldn't be a problem for Bacula, but everything unusual like this
could be a performance penalty. Bacula stores information about
jobs->volumes mapping in catalog and in most cases single job store one up
to a few rows in the table. In your case during restore Director will need
to grab all information about where a job was saved and will grab a dozen
of rows instead of a few.
What benefit do you want to achieve with 500MB volume size?
> If so, are there any known issues other than catalog tuning?
>
> I'm thinking that a larger volume size (and consequently smaller
> volume count) could be warranted (at least for the full pool), but
> I'm wondering if there have been many that have passed volume
> sizes past 2GB or 4GB and if there have been any issues in doing so.
>
In all my Bacula deployments (I've made a lot of them) I do not limit a
volume size. No matter if it is a tape or file. I do not see any problem
with currently available filesystems to handle 100GB or 1TB file. So why do
you need to split your job to 500MB chunks?
I see a performance problem when I have 500k files in a single directory
instead of 1. With this kind of setup I have about 10k volumes. All is
working without a problem.
> My gut is saying to go with 2GB volume sizes, but I'm curious.
>
>
Are you afraid of large files (volumes)? - it was a joke :)
> (Considering that my first hard drive cost me $4000 and was 40MB, all
> the above just sounds crazy.)
>
Good Old Days - it never come back. I'm a far younger then Kern but I
remember a 40MB hard disk drives with a dedicated I/O board.
best regards
--
Radosław Korzeniewski
rados...@korzeniewski.net
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