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Cached Drive Size.


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Many times we recommend that people get a cache drive the size of the parity drive.

This is what we call a warm exercised spare. LOL.


The thinking is, If you happen to have a failure, the first order of business is protecting your array.

Should a drive fail, then it can be substituted for the failed drive while you go and purchase a new cache drive or RMA the failed drive.

if the cache drive is as large as the parity, it can substitute for any drive including parity.

It's a little more money, personally, I think it buys extra insurance with a warm exercised near spare.



What you loose is cached writes for the duration of the swap.

What you gain is peace of mind that your array is protected while you sloth through the slower writes (lol).

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