ASA 5510 RAM upgrade with active/failover pair

[ja1064]

We are planning to upgrade the RAM from 256 to 512 MB each on our two ASA's 5510 which are in active/standby mode. I was wondering if anyone has done this and how can this be done with minimum or no downtime.

My thoughts were to shut the standby and replace the memory and bring it back up. However at this time the two ASA's will have different memory configs so will the active/failover work?If it works then I can make the standby active by shutting down the primary(active) and then upgrade the memory on that.

Let me know if there are documents anywhere on this or if anyone has successfully done it.

Thanks

Vrushali

[nmaio]

ja1064,

For failover to recognize a peer unit the amount of RAM must be the same in each unit.

"Hardware Requirement

The two units in a failover configuration must have the same hardware       configuration. They must be the same model, have the same number and types of       interfaces, and the same amount of RAM."

Please see the following link:

http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a0080834058.shtml

Nick