very poor harddisk performance - PE 1650 Perc/3DI

Götz Reinicke goetz.reinicke at filmakademie.de
Mon May 29 02:10:56 CDT 2006


Hi,

I have a PE1650 with the PERC 3DI Raidcontroller. Internaly there are 
two 10k Drives (Raid 1) on the extern Interface there is a 
non-dell-raid-system attached.

A hdparm -tT gives me about 20 MB/sec bufferd read :-(( without network 
attached or any services like smb running.


[root at dali root]# hdparm -tT /dev/sdb
/dev/sdb:
  Timing buffer-cache reads:   944 MB in  2.00 seconds = 472.00 MB/sec
  Timing buffered disk reads:   58 MB in  3.00 seconds =  19.33 MB/sec

I've checked the Dell bios settings, the raid settings and the 
filesystem settings as fare as I can. Changing settings in proc like

echo 100 5000 640 2560 150 30000 5000 1884 2 > /proc/sys/vm/bdflush

or setting "hdparm -a 255 /dev/sdb"

makes no difference ... I changed the external cable as well.

The system is a RHEL3, EXT3 with userquota.

Any ideas what to check? Any tip??

Thanks and best Regards


Götz
-- 
Götz Reinicke
IT Koordinator - IT OfficeNet

Tel. +49 (0) 7141 - 969 420
Fax  +49 (0) 7141 - 969 55 420
goetz.reinicke at filmakademie.de

Filmakademie Baden-Württemberg
Mathildenstr. 20
71638 Ludwigsburg
www.filmakademie.de



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