Arno Lehmann wrote:
Hello,
On 04.10.2005 21:34, Diogo Melo wrote:
At my work we've done a simultaneous backup with a DLT Tape and after
the full backup, the restore procediment took more time that we would
expect.
Did you turn on spooling and had lots of spool space?
No, I didn't. I'll try this with spool space on. But is there a way to
estimate the optimum spool size easily?
At my work, we use an old DLT-7000. with a native sustained transfer
rate of 7 MB/s. The servers has a commom 100Mb/s LAN. Should an 50MB
spool space be enough?
If I set an extreme large spool space (3GB should be to much?) Does the
record performance go down ?
I've read at the Bacula manual that it isn't a recomended
procedure.
Yes, but it seems to work just fine.
Nice :-)
I'd like to know if someone else here has tried to do
simultaneous backups and successful restores?
Yes. I do most of my backups simultaneously, but I do use spooling.
The restores I tried worked fine. In some cases it needed one more
tape-change or some extra winding time compared to what I'd get
without spooling, but...
Is the performance bigger by doing an simultaneous backup with spool at
the same tape than doing two backups, one before another with spool at
the same tape?
There's any advantages
to use simultaneous backup jobs with at the same tape drive? Does the
backup speed increases a little? It could be better in terms of
backup performance (speed) and could be secure?
... is does give me quite an improvement with overall backup times
(I've got slow clients (which affect the incremental /differential
backup times) and a slow network (which affects the full backups). And
it prevents shoe shining in the tape drives.
Restores to verify the data could be read showed no problems.
In terms of performance gain, multiple jobs with spooling are quite
different to multiple jobs without spooling...
Arno
Thanks a lot!
Diogo.
Thanks a lot again! ;-)
Diogo
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