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Robertomcat

Read cache in P440, ML110 G9

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Robertomcat

Hello good day. Some time ago I have a question regarding the reading cache of the P440 4GB controller, with a configuration of RAID 8X6TB.

I use the server for a large amount of reading (mostly P2P) and I wanted to know if it is effective to assign a percentage of read cache to the controller, or if it is only a waste of access time when using this cache. Currently the entire cache is allocated for writing.

Could someone tell me a bit about this?

Thank you very much!

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schoondoggy

Write cache is very effective, because it acts as a buffer. Read cache is much more difficult as the controller does not know what you are going to want to read. There is a predictive function to read cache. You need to try it to see if it has an effect on your workload.

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Robertomcat
11 hours ago, schoondoggy said:

Write cache is very effective, because it acts as a buffer. Read cache is much more difficult as the controller does not know what you are going to want to read. There is a predictive function to read cache. You need to try it to see if it has an effect on your workload. 

Of course, if the function of the write cache, it would be a disaster. But in the tests I have done I do not see any benefit in terms of the read cache.

 

More than anything I say it, because in the factory configuration comes 25% reading and 75% writing. I understand that for small documents such as PDF, it would be really beneficial, since you do not have to access the disk to read the document. But for P2P data, which are always changing...

Edited by Robertomcat

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