Hi,

        I've been on this list (and RHEL3/4 lists) for quite some time. I've noted over that time that there are different ways to do things in regards to using Qlogic HBAs with RHEL on HP hardware. It would appear I have my choice of:

1) RedHat provided drivers (qla2xxx in my case)
2) HP provided drivers, which I must compile (and which I have gathered over time invalidate my support from RedHat)
3) Qlogic provided drivers

I appear to have things working with the basic multipath setup provided and the RedHat provided driver. However, this is my first foray in SAN with Linux, and my ultimate goal is to provide a highly reliable NAS (NFS/CIFS) server via GFS and RedHat Cluster Suite. I want to make sure I can failover to alternate paths if need be.

So, my question is, will the default setup of multibus, round-robin be enough to handle a path failure? If so, why would I want to set up a "failover" vs a "multibus"?

I have also read that I can use MD (mdadm) to do failover - where does that fit in.

Please feel free to share you opinions/experiences as well as links to anything you think I might find useful.

I have already read the RedHat doc (http://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/en-US/RHEL510/DM_Multipath) and don't feel much more educated than before I started :)

Thanks,

Kevin

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