topic QLogic HBA & MultiPathing in Operating System - Linux

QLogic HBA & MultiPathing

Phil Daws_5 — Tue, 28 Jun 2005 04:57:27 GMT

Hi,

we have two HBAs in a DL585 using the HP Qlogic driver 7.05 which is configured in failover mode. SAN LUNs and LTO2 are presented to the server. What I would like to know is which is the primary path our of the two HBAs to the LUNs? Can this be set via the modules.conf?

TIA

Re: QLogic HBA & MultiPathing

Slawomir Gora — Tue, 28 Jun 2005 06:56:49 GMT

Hi,

you will need SANsurfer program. You can download it from qlogic web site.

Re: QLogic HBA & MultiPathing

SAKET_5 — Tue, 28 Jun 2005 23:03:28 GMT

Hi Phil,

The qlogic driver in question does not provide any load balancing - therefore to identify your active HBA & and the active switch port/fabric, you can simply start some disk I/Os (a simple "dd" would do) and then monitor the two switch ports to which the server FCAs connect to - via "portperfshow" command on the switches - and identify which port is the traffic going through. You should only see traffic on one of those switch ports. This should suffice in identifying which FCA is your active one - as there is no load balancing you can be assured that this FCA will remain to be active unless it fails, i.e. if you have configured the "fo" properly.

Hope, it helps.

Cheers,
Saket.