[CentOS] Qlogic HBA scanning issues with CentOS 5.1 ?

Fabian Arrotin fabian.arrotin at arrfab.net
Fri Dec 14 22:04:10 UTC 2007


On Fri, 2007-12-14 at 21:55 +0000, Finnur Örn Guðmundsson wrote:
> 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.

I've installed the same machines on several IBM DS3xxx or DS4xxx SANs
but i used the provided rdac multipath driver (adviced by IBM in their
documentation)

> 
> 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.

As already said, the rdac driver/userspace tool contains a hot_add
script that takes care of that .. but i admit that i've not yet updated
those machines to 5.1 because of a need to rebuild the rdac kmod ...
> 
> Has anyone had any issues with scanning for new devices off san after 
> upgrading to 5.1 ?
> 
> Thanks,
> Finnur


-- 
Fabian Arrotin <fabian.arrotin at arrfab.net>
Solution ? 
echo '16i[q]sa[ln0=aln100%Pln100/snlbx]sbA0D4D465452snlbxq' | dc
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