Upgrade ASA 5510 in Active/Standby

I would like to know the best method for upgrading two Cisco ASA 5510's that are configured in active/standby mode.  I don't want to take both units down for the upgrade, but upgrade one while the other is still active.  I was thinking of the following:
1. Failover to Standby unit
2. Upgrade Primary unit's OS and ASDM
3. Once Primary is finished with upgrade, failback to primary and make it active
4. Then upgrade the Secondary unit

Does anyone see any problems with this method?  Has anyone ever performed this type of upgrade whle keeping one unit online/active?  Just want to minimize downtime.
shaftkbAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Alan Huseyin KayahanCommented:
         Your way looks ok. I used to upgrade both at the same time. I did not start ASAs in monitor mode. I deleted the files and copied from tftp as flash:image, and as asdm image then restarted both. They started OK.
          But your way is much secure. Because sometimes in some version upgrades, new version does not recognize some commands/configs set by old version, and configuration may get corrupt. If you do the version upgrade for one at first, you will be able to see failed commands, make some workaround and check the matching command for new version, and then apply.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Cisco

From novice to tech pro — start learning today.