[CentOS] Qlogic HBA scanning issues with CentOS 5.1 ?

Fri Dec 14 22:13:27 UTC 2007
Finnur Örn Guðmundsson <finnzi at finnzi.com>

Fabian Arrotin wrote:
> 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
>>     
>
>
>   
> ------------------------------------------------------------------------
>
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>   
Hi,

Sorry, forgot to mention i got a IBM SVC as a storage device. IBM 
recommends using device-mapper-multipath for RHEL 5. There is not SDD 
(propriatory IBM driver for the ESS, DS6000/DS8000, SVC devices) for RHEL 5.


Bgrds,
Finnur