Should I dedicate an entire SSD (256 GB) as L2 cache?

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OopyDoopy
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Joined: Fri Nov 08, 2019 1:13 am

Should I dedicate an entire SSD (256 GB) as L2 cache?

Post by OopyDoopy » Fri Nov 08, 2019 1:16 am

I don't see any best practice information regarding this. Since SSD performance degrades as it fills, does it make more sense to give primocache, say, 75% of an SSD, or is the software smart enough to properly manage the space if you give it the entire SSD? Thanks for any advice.

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support
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Re: Should I dedicate an entire SSD (256 GB) as L2 cache?

Post by support » Fri Nov 08, 2019 2:43 am

PrimoCache so far is not so smart. It also depends on SSD hardware. For intel optane series, it's quite safe to use the entire SSD. Others we are not sure. For safety you may use 80%~90% of an SSD.
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Jaga
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Re: Should I dedicate an entire SSD (256 GB) as L2 cache?

Post by Jaga » Fri Nov 08, 2019 10:06 pm

I reserve no less than 10% unused (un-partitioned) space at the end of all of my SSD drives, even the NVMe's. It's a "Best practice" sort of thing based on the technology, which can help with garbage collection and the times when a drive gets really full. If you were devoting an entire SSD (whichever technology) to a L2 cache, I'd say it's almost mandatory to have unused space. I haven't dealt directly with the Optane, so you can believe Support's advice with regards to them.

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