Switch root failing on boot

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I have a hand full of Red Hat servers that are booting from SAN using
QLogic fibre cards (QLA2462) and a Cisco fabric. 

They had been running fine for months. Now, more often than not, they
kernel panic on boot after it attempts to switch from the RAM disk to
the disk. 

The volumes are there because the QLogic BIOS is finding them and the
system is loading and executing Grub. But something happens with the
QLogic driver where it does not recognize the root volume, thus it
fails. 

Can anybody shed any light on where I should be looking to get this
solved? I don't know if this is a Red Hat, a QLogic, a Cisco problem,
what. If I can just get any info, pointers, debug info, anything.
Thanks. 

---
Jim Lester | Linux Product Specialist
Jim.Lester@xxxxxxxxxxxxxx
(o) 952.294.2802
(c) 763.218.6012
Compellent Technologies | www.compellent.com


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