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Re: Preferred Path Linux with EVA

 
Jose_129
Regular Advisor

тАО02-01-2007 10:43 AM

тАО02-01-2007 10:43 AM

Preferred Path Linux with EVA

I have a server with Red Hat AS 3 and storage EVA, this installed the driver of qlogic failover. As the Preferred Path in Red Hat is defined? The objective is that the data are acceded by a fiber card.

Regards,

Jos├й
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Steven E. Protter
Exalted Contributor

тАО02-01-2007 06:35 PM

тАО02-01-2007 06:35 PM

Re: Preferred Path Linux with EVA

Shalom,

There is no "preferred" path. Path is determined partly by the position of the fiber card, and how the controller is set up.

EVA's present data to systems based on the WWN, World Wide Name of the fiber card.

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Ivan Ferreira
Honored Contributor

тАО02-02-2007 02:19 AM

тАО02-02-2007 02:19 AM

Re: Preferred Path Linux with EVA

Interactions between Linux and EVA/s should be done using the Qlogic MPIO driver. This driver is not included with Linux but is supplied by HP.

With this driver a user can ensure that I/Os are sent to a Vdisk only through the non-proxy controller of that Vdisk.

Furthermore, load balancing across HBA/s and all the host ports of the non-proxy controller is done. If failover to the other controller becomes necessary, the ownership of the Vdisk will be transferred to that controller.
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