Hardware migration on MSCS environment

We are trying to migrate our Quality Assurance system(QAS) system which is on a MSCS environment to a new hardware. The SAP version is ECC 5.0 on a oracle 9.2 and Windows 2000 server. The size of the DB is approximately 800GB, and we cannot afford a downtime of more than 24 hours.
Hence "system copy" will not be possible as it would need a very long downtime.
We also plan to adopt the same strategy on our Production server.
Could somebody suggest the best possible option other than system copy that we could use to migrate our system to the new hardware with minimum downtime?

Rock,
Are you sure about your estimates? I've taken 1.5TB systems via SAP export in 10 hours for a system copy method.
Another option is to build your QAS system as new (using all the same SID as your current QAS system) then use an offline/online backup to restore it. The same for your prod system - we did a migration where we took a backup one weekend, restored it on the new hardware the next week, then used the redo logs from the live production system to get it up to date - like a hot standby. When we made the cuttover, the whole process took about 30 minutes between taking the old prod system offline to bringing the new system online.
This, of course, will only really work well if you are not changing the SID, which it sounds like you are not.
The system copy via SAPINST is a better method if you are looking to adjust/change SIDs in the system.
Best of luck!
tim

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