Hi Phil,
I have done some tests and appended the results, maybe they are of interest
for somebody. As a conclusion I would say raid5 and raid6 make in my situation
nearly no difference.
Thanks to all for hints and explanation
Karsten
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first - just copy a dir with a size of 2,9 GB, it was copied once before so I
think there are still data buffered?
OLDER war im Cache? hatte Dir vorher kopiert
kspace9:~ # date ; cp -a /home/roemke/HHertzTex/OLDER/* /raid5/ ; date
Fr 1. Jul 16:15:57 CEST 2011
Fr 1. Jul 16:16:26 CEST 2011
kspace9:~ # date ; cp -a /home/roemke/HHertzTex/OLDER/* /raid6/ ; date
Fr 1. Jul 16:17:27 CEST 2011
Fr 1. Jul 16:17:58 CEST 2011
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now a test with bonnie, I found this example online and the parameters seems
senseful to me (I've never done performance tests on hd's before, so I searched
for an example)
bonnie, found
-n 0 : file creation 0
-u 0 : root
-r : memory in megabyte (calculated to 7999)
-s : file size calculated to 15998
-f : fast, skip per char IO-tests
-b : no write buffering
-d : set directory
kspace9:~ # bonnie++ -n 0 -u 0 -r `free -m | grep 'Mem:' | awk '{print $2}'` -s $(echo "scale=0;`free -m | grep 'Mem:' | awk
'{print $2}'`*2" | bc -l) -f -b -d /raid5
Using uid:0, gid:0.
Writing intelligently...done
Rewriting...done
Reading intelligently...done
start 'em...done...done...done...
Version 1.03d ------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
kspace9 15998M 96365 20 48302 12 149445 18 113.7 0
kspace9,15998M,,,96365,20,48302,12,,,149445,18,113.7,0,,,,,,,,,,,,,
kspace9:~ # bonnie++ -n 0 -u 0 -r `free -m | grep 'Mem:' | awk '{print $2}'` -s $(echo "scale=0;`free -m | grep 'Mem:' | awk
'{print $2}'`*2" | bc -l) -f -b -d /raid6
Using uid:0, gid:0.
Writing intelligently...done
Rewriting...done
Reading intelligently...done
start 'em...done...done...done...
Version 1.03d ------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
kspace9 15998M 100321 22 48617 13 131651 16 120.2 1
kspace9,15998M,,,100321,22,48617,13,,,131651,16,120.2,1,,,,,,,,,,,,,
===================================================================================
results for old raid 1:
a test of old raid 1 which I have done unintended, because I forgot to mount
the raid array :-)
mounten vergessen ---------------------------------------------------------------------
-> vergleichsresultate :-)
kspace9:~ # date ; cp -r /home/roemke/HHertzTex/OLDER/ /raid5/ ; date
Fr 1. Jul 16:07:32 CEST 2011 ^^^ not raid 5, old raid 1, forgot to mount
Fr 1. Jul 16:08:39 CEST 2011
aehnlich (similiar)
test mit bonnie++
kspace9:~ # bonnie++ -n 0 -u 0 -r `free -m | grep 'Mem:' | awk '{print $2}'` -s $(echo "scale=0;`free -m | grep 'Mem:' | awk
'{print $2}'`*2" | bc -l) -f -b -d /raid5 <-- not raid 5, still the older raid 1
Using uid:0, gid:0.
Writing intelligently...done
Rewriting...done
Reading intelligently...done
start 'em...done...done...done...
Version 1.03d ------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
kspace9 15998M 62977 9 34410 9 101979 13 66.7 0
kspace9,15998M,,,62977,9,34410,9,,,101979,13,66.7,0,,,,,,,,,,,,,
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