How many Disk do we store Flash back on?

We used oracle 10G,
we have archive logs 26G/day
we think of flash back on.
How many disk do we store flashback files?
Please help us for informations, when we need oracle flashback?

Are you asking about raid levels? If you are only copying your archive logs to one destination, then you should at least have your archivelog disk mirrored, if not a higher raid level like level 5. It would be advisable to archive to multiple locations. Remember, if you lose one of your logs before they can be backed up, you will lose data if you have to perform a recovery. The amount of disk space you would need would depend on how many archive logs you intend to keep available on disk. Also, are you using the flashback area for your rman backups? You would also need to have additional space for each of these backups you want to have available on disk. Remember, you can always backup archivelogs to tape and delete them.
My general rule of thumb is that I like to only use up to 60% of a disk available for logfiles. This way if you have a large spike in DB use for a period of time you are not going to quickly run out of space. In this example if you generate 25G of archive and you want to keep 5 days worth, then you would generate 125G during this time period, I would probably want to have 200G of disk available to give you 60% normal usage.

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