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caching raid controllers - environments they are most useful for

There has been a debate among a few colleagues of mine centered around what can be gained by having larger cache on RAID controllers. While all kinds of 'tests' can be performed that show a larger cache can help with this or that specific type of IO on  a test basis, the other half of the question is that for a very large enterprise - hundreds of users  - with a wide mix of processing going  on - a great deal of word processing/Excel of relatively small files, some line of business app with some kind of SQL database, e-mail, the occasional large file transfer - the argument is that in general the users will not see any difference.

I would appreciate feedback on this especially if it's  backed up my real world stats as opposed to 'simulation' stats produced by  testing software or simply theories/logical analysis of why one or another alternative should make a difference that does not have some actual real world numbers to back it up.
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andyalder

8/22/2022 - Mon
Aaron Tomosky

The cache on the raid controller really just helps to smooth out the disk io. It also helps with iops as the controller can report things are written before the disk head ever actually writes it.

If you want a real cache, look to zfs. I'm still a relative noob but it's definitely the direction I'm going.
ASKER
Line One

Please re-read my question. I specifically asked for stats or real world experience - I was looking for an Expert not a noob.  I am not a noob in this area, I know the theory of caching as do my colleagues - we have all had experience with caching controllers. I wanted someone who knew even more than us, had more facts to contribute so as to help resolve the discussion at a level beyond our circle of networking expertise.  I gave a very specific case/scenario to deal with.  Not sure why you chose to answer this as nothing you wrote matches up with what I asked  but the upshot of you answering will probably mean that I have to possibly request attention to get somebody else to answer or just delete the question and repost. Either way it's a hassle.
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ravenpl

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andyalder

I do not think that was worth a C grade, I'll ask CS to take a look.
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