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
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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@arrfab.net>
Solution ?
echo '16i[q]sa[ln0=aln100%Pln100/snlbx]sbA0D4D465452snlbxq' | dc
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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





------------------------------------------------------------------------


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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
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