On Tue May 28 2002 05:09, Bartho Saaiman wrote:
I have a problem where my dumper is slow and the taper seems to be
faster:
STATISTICS:
Total Full Daily
-------- -------- --------
Estimate Time (hrs:min) 0:02
Run Time (hrs:min) 11:21
Dump Time (hrs:min) 9:42 9:42 0:00
Output Size (meg) 14818.3 14818.3 0.0
Original Size (meg) 20804.7 20804.7 0.0
Avg Compressed Size (%) 71.2 71.2 --
Filesystems Dumped 1 1 0
Avg Dump Rate (k/s) 434.8 434.8 --
Tape Time (hrs:min) 1:37 1:37 0:00
Tape Size (meg) 14818.4 14818.4 0.0
Tape Used (%) 74.1 74.1 0.0
Filesystems Taped 1 1 0
Avg Tp Write Rate (k/s) 2606.1 2606.1 --
Is there a way of changing this to speedup backups.
You have 1 DLE, size 20 Gbyte, dumping to holdingdisk at a speed
of 434.8 Kbytes/sec. Then it is written to tape at a speed of 2606
Kbytes/sec.
Amanda cannot take advantage of parallelizing different DLE's
if there is only one.
You do have the advantage that your tape is written at the best speed,
without having to stop/start the drive (bad for the tape and drive and
sometimes wasting tape capacity too).
Also, if you add more DLE's (other computers) they will be done
in parallel, and will not add much (if any) to your total run time.
So you have a nice growth path :-)
I see you also compress the backup. You can play a little with the
compression settings in your dumptype:
- where to compress: 'server' or 'client (use the fastest CPU!)
- algorithm: 'fast' or 'best' (fast can much faster than 'best')
Set something like: "compress server fast".
(But this will not speed up your process from 434 k/s to 2600 k/s.)
Maybe you to investigate a little if there is another reason (besides
a slow file server) why the dumping is so slow.
--
Paul Bijnens, Xplanation Tel +32 16 397.511
Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM Fax +32 16 397.512
http://www.xplanation.com/ email: Paul.Bijnens AT xplanation DOT com
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