[CentOS] Qlogic HBA scanning issues with CentOS 5.1 ?

Fri Dec 14 21:55:08 UTC 2007
Finnur Örn Guðmundsson <finnzi at finnzi.com>

Hi,

I got few servers (IBM HS20,HS21 blades, IBM xSeries 3650 & others) 
connected to a dual fabric san throught Qlogic HBA's (23xx, 24xx). 
Multipathing is done with device-mapper-multipath.

On CentOS 4.x i can scan for new scsi devices without any problems, get 
them up with multipathing & use them without any problems.

However, after i started installing CentOS 5.1 (did not notice this 
problem with CentOS 5) i cannot seem to rescan without huge problems. 
Sometimes when i rescan after presenting a new LUN to the server nothing 
is detected, and sometimes the device comes in without any problems at 
all. Sometimes i even loose some paths after rescanning.....again, i had 
no problems at all with CentOS 4.x.

I use the Qlogic script (Dynamic Target and LUN Discovery 
<http://support.qlogic.com/support/EULATemplate/Template.aspx?TemplateID=9&path=http://download.qlogic.com/ms/56614/ql-dynamic-tgt-lun-disc-2.2.tgz> 
2.2) to scan for new luns.

Has anyone had any issues with scanning for new devices off san after 
upgrading to 5.1 ?

Thanks,
Finnur