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