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Re: [Networker] Disk-based backups
2007-11-14 14:48:52
On Nov 14, 2007, at 1:30 PM, Goslin, Paul wrote:
Our experience with backing up to disk and then staging to tape has
been
OK... You need to understand that it's like running your backups
twice... So if it takes 2 hours to run a group to disk, it will take
another 2 hours to stage those group save-sets to tape. First pass we
wrote the save-sets to an AFTD device, then the second pass staged
them
from disk to tape (staging initiated on Windows NW server by scheduled
task), purging the staged save-sets from the disk once all the save-
sets
were written to tape. Seems we had a few staging problems where the
staging process would sometimes crash before finishing, leaving some
save-sets on the disk to be manually staged to tape in order to finish
the process.. Some of the save-sets even got lost in this process
due to
the issues we experienced.. It did not leave me with a secure feeling
overall... We now simply write everything directly to tape to keep
things easier to manage.
I have been doing staging via an advanced file type device for roughly
two weeks. Last Friday, my ADVFS device ran out of space. This is with
NetWorker 7.4 under Solaris 10. I was only staging to tape once a
week, and I discovered that period was too long. Now, I stage the
oldest save sets to tape every 9 hours. I have seen the throughput
from disk to tape run around 70MBs, so I am very happy with that
throughput. I just finished doing a test recover of 12GB worth of log
files that were mostly on tape (Sony S-AIT) and some on disk. The
recover only took a few minutes and it worked fine. The client where I
did this test happens to be the server that hosts this list, which is
a fairly old 1Ghtz Linux box.
The disk device is actually a Sun Fire X4500 and my server's licensed
for 10TB worth of staging. This X4500 uses the same Sony tape library
that our Sun T2000 NetWorker server uses. The tape library has 14 tape
drives. Four tape drives are set up for dynamic drive sharing. Five
are dedicated to the X4500 and the other five are dedicated to the
T2000.
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