--On Thursday, May 21, 2015 09:06:41 AM +0200 Kern Sibbald 
<kern AT sibbald DOT com> wrote:

> Bacula does keep 64 bit addresses.

Excellent.  Not surprisingly, I'm not dealing with file sizes near 2^63,
but I *do* need to back up files that are in the 2^39 range (from
filesystems that are in the 2^46 range onto virtual cartridges no
larger than 2^43).  No, these aren't database files, they're huge
chunks of write-once data for which we need archival copies.  I'm
still debating whether Bacula is the right tool for the job in this
case.  Network-based copies to geographically different locations
is a non-starter, so it's got to be a variant of sneaker-net.

> On the SD
> output end, if you do not limit your Volume size, there will surely be
> some problems at 2^63.  Of course, who would ever want to write such a
> large volume?

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?  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.

My gut is saying to go with 2GB volume sizes, but I'm curious.

(Considering that my first hard drive cost me $4000 and was 40MB, all
the above just sounds crazy.)

Devin


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