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...
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…
Installed RHEL4 on a system with both internal storage (HP SmartAray 5i – cciss) and external disks through Qlogic FCS HBA. During install, the local disks were detected as /dev/cciss/c0d0 while the external disks were detected as /dev/sda and /dev/sdb After installation was done, Grub started with incorrect mapping. For no apparent reason, Grub searched…
As part of my job, as an Infrastructure and Mr. Fix-it in my company, where it comes to Unix, Windows, HA-Clusters, Storages, etc, I often get to encounter some unpredictable situations. During the last two days I’ve had to setup a Compaq Proliant ML360G2 with the following configuration (to simulate customer’s environment): RHEL AS 3…
