On Mon, Aug 25, 2008 at 06:12:08PM +0200, Kern Sibbald wrote:
> If you have time available, I personally would prefer to see a new
> Bacula driver written using the S3 API, which as far as I can tell
> would be system independent.
It would, yes.
> A SCSI driver is something that you have to install in your OS, and as
> such is highly OS dependent, so would be available only on systems
> that have such a "module" for them. In addition, Bacula's SCSI
> interface will not co-exist well with S3 since when Bacula is writing
> to a tape (using the open/read/write/ioctl/close SCSI interface), it
> expects the device to behave like a tape. S3 is more like a
> filesystem. If one did succeed in such an endeavor, the advantage
> would be that there should be no changes to Bacula.
It *is* more like a filesystem, but still not actually *like* a
filesystem. E.g. you don't have the concept of directories, but you have
a much more extensible concept of metadata. You can't open files
read-write, and AFAIK you can only upload and download entire files, so
while a filesystem driver for S3 could emulate seeking, it'd be costly.
> If I am not mistaken, S3 does already have an interface that works
> through normal file open/read/write/lseek/close which would be
> compatible with Bacula's disk (or File) driver. It *should* work, but
> it might be much less satisfactory (less well integrated with S3) than
> a real S3 driver.
Agreed.
--
Soren Hansen |
Virtualisation specialist | Ubuntu Server Team
Canonical Ltd. | http://www.ubuntu.com/
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