topic Re: SAN-Redhat in Operating System - Linux

SAN-Redhat

ossupport55 — Sun, 10 May 2009 10:40:52 GMT

hi

Dear all,

We are running RHEL5 with the following devices and drivers

Hardware
Fibre Channel: QLogic Corp. ISP2432-based 4Gb Fibre Channel to PCI Express HBA (rev 02)
Fibre Channel: QLogic Corp. ISP2432-based 4Gb Fibre Channel to PCI Express HBA (rev 02)

Driver version:
8.02.00-k5-rhel5.2-04 - Output of modinfo on qla2xxx

Firmware:
4.03.02 [IP] [Multi-ID]

I need assistance to setup DM-Multipath with Hitachi arrays and need online addition of LUNs afterwards as we get n amount requests for storage expansion. Please let me know whether there are any known issues/problems with the above given and what should i use to get the LUNs detected without a reboot to the server(s). We have a excess of 300 servers. Please help.

Regards

Re: SAN-Redhat

Steven E. Protter — Sun, 10 May 2009 14:35:57 GMT

Shalom,

Avoiding a reboot is nearly impossible.

You can install PSP for proliant systems. That includes a new kernel and to get full benefit you need to do a reboot.

Perhaps if the disks are all set up and zoned to the HBA's by WWN, you can use the hp_rescan utility to detect the disks without a reboot.

SEP

Re: SAN-Redhat

skt_skt — Sun, 10 May 2009 17:19:48 GMT

detecting LUN does nor require reboot almost 99%.. We have a comibination if RHEL 2.1, 3, 4, 5 servers.

we use the combinations of those commands, but not limited to.

echo "scsi-qlascan" > ${HBA_DIR}/${HBA_NUM}

echo "scsi add-single-device ${HBA_NUM} ${CHN} ${ID} ${LUN}" > /proc/scsi/scsi

Re: SAN-Redhat

Jimmy Vance — Mon, 11 May 2009 01:21:50 GMT

Install the fibreutils rpm from this package

hp-fc-enablement-2009-03-30.tar.gz

http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=us&prodTypeId=3709945&prodSeriesId=1844104&prodNameId=1844105&swEnvOID=4004&swLang=8&mode=2&taskId=135&swItem=co-69719-1

the fibreutils package contains hp_rescan which will find you HBA's and force a rescan

Re: SAN-Redhat

ossupport55 — Mon, 11 May 2009 02:00:10 GMT

Thanks for all the replies. As my current config is as above what will be the impact on the upgrade to the hp-fc-enablement-2009-03-30.tar.gz.I'm worried to to know the above hardware/Driver/Firmware are compatible. Is there a way to findout the ideal,compatible matrix of the above as against hardware and the OS? Please share you experience with DM-Multipath as well.
Cheers!

Re: SAN-Redhat

skt_skt — Mon, 11 May 2009 16:06:25 GMT

check doc attached; Label part is not required if LVM available

Re: SAN-Redhat

ossupport55 — Tue, 12 May 2009 01:37:30 GMT

Thanks Santhosh, great article