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Oracle RAC with EMC iSCSI Storage Panics

I have had a system panicking when running the mentioned below configuration: RedHat RHEL 4 Update 6 (4.6) 64bit (x86_64) Dell PowerEdge servers Oracle RAC 11g with Clusterware 11g EMC iSCSI storage EMC PowerPate Vote and Registry LUNs are accessible as raw devices Data files are accessible through ASM with libASM During reboots or shutdowns,…

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Hot adding Qlogic LUNs – the new method

I have demonstrated how to hot-add LUNs to a Linux system with Qlogic HBA. This has become irrelevant with the newer method, available for RHEL4 Update 3 and above. The new method is as follow: echo 1 > /sys/class/fc_host/host/issue_lip echo “- – -” > /sys/class/scsi_host/host/scan< Replace "<ID>" with your relevant HBA ID. Notice - due...

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HP EVA bug – Snapshot removed through sssu is still there

This is an interesting bug I have encountered: The output of an sssu command should look like this: EVA> DELETE STORAGE “Virtual DisksLinuxoracleSNAP_ORACLE” EVA> It still leaves the snapshot (SNAP_ORACLE in this case) visible, until the web interface is used to press on “Ok”. This happened to me on HP EVA with HP StorageWorks Command…

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Hot-Adding SAN lun to Linux (RH with Qlogic drivers)

cat /proc/scsi/qla2xxx/$Z” where Z represents the SCSI interface the Qlogic has taken for itself, you’ll get something like this: <Snip> . . </Snip> SCSI LUN Information: (Id:Lun) * – indicates lun is not registered with the OS. ( 0: 0): Total reqs 63185608, Pending reqs 0, flags 0x2, 0:0:81 00 Assuming you’ve just added the…