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Re: RE Tuning for performance
2006-08-24 10:51:35
On Thu, 24 Aug 2006 at 4:36pm, Cyrille Bollu wrote
root@srv-fhq-bkp bonnie++-1.03a]# ./bonnie++ -u 0
(snip)
Version 1.03 ------Sequential Output------ --Sequential Input-
--Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec
%CP
srv-fhq-bkp.fed 16G 36522 95 120980 60 58116 21 17956 49 56374 27
431.1 0
I see bad sequential input with getc but good (better than what I get with
Amanda) block sequential input.
The getc/putc perfomance is a measure of glibc, not your disks. The only
numbers I'm really interested in are the block output (i.e. reads) and
block input (i.e. writes) to the array. You can read from the array at
100MB/s, so that is *not* what is limiting your bandwidth to the tape
drive (unless the array is otherwise busy when you're trying to run
backups). Have you tried increasing amanda's blocksize and/or testing
with 'tar -b'?
--
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University
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