ralf.lebeda AT ezi DOT de wrote:
what could be the reason for a very very slow backup?
Actually, I have no idea. Just a few remarks.
My backup server is a celeron 500 with 128 MB memory and a tandberg slr 24
tape box.
My network is 100MB switched.
The gamma client is a 800 MHz PIII system.
The dv-02 client is a 1,2 GHz Athlon system.
My backup server is a celeron 300 MHz with 128 MB memory.
And I get a much larger throughput.
So it's not the servers capacity, neither the clients.
I have no explanation for this slowness. If I copy a big file with scp from
gamma to backup server it is normal speed.
Also when you're copy from two different hosts at the same time?
A frequent error is a duplex mismatch on the switches; but that
would also be noticed when copying a large file from one host.
Just a tought...
Does "netstat -ni" have a large value in the error columns
on client and/or server?
Bythe way the backupjob on gamm was only one iso image file.
Was that gnutar or dump?
Is the first time you make a backup? or was it fast before and
suddenly slow?
Do you have some clients where the problem does not exist?
Any strange message in the debug-files on client:
/tmp/amanda/*.<datetimestamp>.debug .
Was there any other activity on the clients?
Was there some non-responding nfs-directory on the clients (which
tar has to stat to find out it is an nfs-directory and skip it).
Is there anything else between the server and client? firewall
with misconfigured traffic-shaper, etc...?
When this backup is running, can you find out what the
dump/tar on the client is doing? (strace, truss, lsof...)
Thanks and Rgds
Ralf
STATISTICS:
Total Full Daily
-------- -------- --------
Estimate Time (hrs:min) 0:00
Run Time (hrs:min) 26:59
Dump Time (hrs:min) 51:53 51:53 0:00
Output Size (meg) 1444.5 1444.5 0.0
Original Size (meg) 1444.5 1444.5 0.0
Avg Compressed Size (%) -- -- --
Filesystems Dumped 2 2 0
Avg Dump Rate (k/s) 7.9 7.9 --
Tape Time (hrs:min) 0:16 0:16 0:00
Tape Size (meg) 1444.5 1444.5 0.0
Tape Used (%) 12.0 12.0 0.0
Filesystems Taped 2 2 0
Avg Tp Write Rate (k/s) 1517.3 1517.3 --
USAGE BY TAPE:
Label Time Size % Nb
LXBACK127 0:16 1444.5 12.0 2
NOTES:
taper: tape LXBACK127 kb 1479232 fm 2 [OK]
DUMP SUMMARY:
DUMPER STATS TAPER STATS
HOSTNAME DISK L ORIG-KB OUT-KB COMP% MMM:SS KB/s MMM:SS KB/s
-------------------------- --------------------------------- ------------
dv-02 -OpenOffice 0 821180 821180 -- 1502:31 9.1 9:011517.2
gamma -amandatest 0 657970 657970 -- 1610:41 6.8 7:141517.4
Use the "columnspec" parameter in amanda.conf to add some spaces between
the columns.
(brought to you by Amanda version 2.4.4p3)
--
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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