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File caching?



I've been asked to cache some high traffic files on one of our server. Is there an easy way to get ext3/ext4 filesystems to cache several GB of files in memory at once? I'd like writes to happen normally but reads to happen from RAM. (We have plenty of RAM so that isn't an issue.)

If that isn't possible I can cache the files myself. Does the filesystem keep a cache in memory of the file attributes such as modification time? So if I check for a change will the disk actually have to physically move to check the mod time?

Thanks,
Michael McGlothlin

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