On 2007-09-24, Nuno Fernandes <[EMAIL PROTECTED]> wrote:
>
> We have controller A and controller B connected to both FC swicthes. The host
> sees 4 paths to the LUN (2 active through active controller and 2 ghost
> through passive controller).
I'm not familiar with dm-multipath, but at least with engenio/lsi's RDAC,
that's an unsupported/known-bad configuration. Ref:
http://lsi.com/rdac/ibm_sw_ds4krdac_0900A522_linux_anycpu.txt
""
8. Fibre channel configuration. If a host server has
multiple HBA ports and each HBA port sees both
controllers (via a un-zoned switch), the Linux RDAC
driver may return I/O errors during controller failover.
The recommendation is to use multiple unconnected FC
switches to zone the FC switch into multiple zones so
that each HBA port sees only one controller in a
DS4000 storage subsystem.
""
-jf
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