On our tape backups, which are virtual full backups, we use
spooling to increase throughput. We run 5 parallel virtual-full
backups that are spooling to disk, but only one de-spools at a time
to tape. This tends to keep the tape drive streaming more often
than not, and the parallel virtual-full backups let the whole thing
finish faster.
If I understand what you are saying here these are jobs that create a
full backup from an "Always Incremental" schedule?.
Yes. We love always incremental backups. The dramatically lessened
impact on the clients of never having to run a full backup (other than
that very first one when you start AI) is really nice.
We use the virtual full backups to generate off-site tapes once a week.
On your single despool to tape, what sort of through put do you see
on LTO-6?
Usually right around the drive's max 160 MB/s. Some times the five
concurrent virtual full backups consume enough disk bandwidth to slow
that down somewhat. We don't have a configuration as diverse or rich as
yours. Our backup server has 12 8TB SAS drives in a pair of ZFS raidz2
strips. (We are running FreeBSD.) So that one large pool suffices for
all storage, including the pool.
If you use the SSDs as your spool, I'd be a bit surprised if you had
problems keeping your LTO-7 tape drive streaming. Especially since it
should stream down to 100 MB/s or so, assuming that the Internet is
right. :)
Good luck.
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