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Booting with multiple paths to a disk
Hardware:
IBM BladeCenter with HS20 Blades. 2 QLogic dual port cards (4 ports total)
EMC Clariion CX500
OS:
RHEL 3
Other Software:
PowerPath light
Each blade has the ability to see 4 paths to the same disk though any of the four ports on the FC cards. PowerPath (light) was required so that I could see all four paths. Without this, I could only see two paths (through the primary SP).
How would I go about setting the Linux blade up to see and use all four paths (for failover) as well as boot on any of the living paths?
Initial attemtps have had some success, however, when the fiber was pulled, the OS didn't react well (with i/o errors) despite seeing all four paths registered on the SAN.
Another oddity is that when I specify the root to boot off of, I do not see that path in powermt (the other 3 are listed there though).
Is native multipathing stable & mature in Linux?
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