Our cluster was supplied with two IBM DS3400 RAID arrays connected with fibre channel. Both are old and one is failing so we bought an IBM
V3700 to replace it. The V3700 complained that we were using the IBM’s RDAC driver (true) and we were advised to change to using Linux multipath. I’ve done that but the default configuration for the DS3400s is:
device {
vendor IBM
product 1726-4xx
path_checker rdac
features 1 queue_if_no_path
hardware_handler 1 rdac
prio_callout /sbin/mpath_prio_rdac /dev/%n
no_path_retry 300
rr_min_io 1000
}
The V3700 is still complaining and I note the “path checker rdac” and mpath_prio_rdac lines. Is this rdac the same as IBM’s RDAC, and if so how can I get rid of it?

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