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Downgrading HBA Drivers

Posted on 2009-06-29
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Last Modified: 2013-11-14
We have servers housed a DR site. Today was informed by the group that monitors them that we have to downgrade the drivers on the HBA from 2.42 to 2.40. And also upgrade PowerPath to 5.2.1. Unfortunately I have very little experience with that and my fear is that doing so will cause me to loose something on box or not be able to see the drives. Has anyone done this before?

Sean
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Question by:SeanHenry
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5 Comments
 
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Expert Comment

by:astrochimp
ID: 24746259
I've done this both ways (upgrade and downgrade) and everything worked out great. Now if you were talking about firmware, I think downgrading that is a bit more risky.

Obviously, as with any driver change, you will have some downtime. That's about the worst thing that will happen.

Having said all that, make sure your backups are up to date.
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Author Comment

by:SeanHenry
ID: 24746298
But when I downgrade do I have to make sure the driver is happy with the firmware on the card?
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Expert Comment

by:astrochimp
ID: 24746456
The change log for the firmware will usually have all the supported driver versions. In your case the change is so small that you will most likely be fine. I've only had this be an issue once in my experience and it was easily resolved by rolling back the driver.
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Author Comment

by:SeanHenry
ID: 24746531
HBAnyware has to rolled back as well to match the driver? Correct. So no cut and dry procedure aside from removing the driver and the software?
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astrochimp earned 750 total points
ID: 24746653
I think this is just a simple 2 step process. First downgrade the drivers and then upgrade powerpath. Only the first step may cause any problems. The way to make sure it doesn't is to check the change log of the drivers and see whether anything about the firmware is mentioned.
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