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Faster or larger ssd for L2 cache?
Posted: Mon Nov 25, 2019 12:56 pm
by yhKIM
I am trying to accelerate my 1TB HDD via primocache.
I have two ssd to spare.
120 gb sata3 ssd(samsung)
and 32gb intel optane 800p
My cpu is sandybridge so I don't have official optane support.
which ssd would be better? in that 1tb hdd, there are vm files (hyper-v ubuntu)
that I use for my data analysis
Re: Faster or larger ssd for L2 cache?
Posted: Mon Nov 25, 2019 10:50 pm
by Jaga
It depends on your usage, and how much data you have needing to be cached. How full is the 1TB drive? If it's only ~320 GB full, the Optane would do well. If it's more like 500+ GB full, the Samsung would be a better choice. I try to get somewhere between 10% and 20% data coverage (the size of the L2) with any L1/L2 caching task.
Seeing as you have VM files that get used, they would probably run much faster on the Samsung, since it would cache a larger chunk of them over time. Just guessing, but it seems logical.
Re: Faster or larger ssd for L2 cache?
Posted: Tue Nov 26, 2019 12:33 am
by yhKIM
Jaga wrote: ↑Mon Nov 25, 2019 10:50 pm
It depends on your usage, and how much data you have needing to be cached. How full is the 1TB drive? If it's only ~320 GB full, the Optane would do well. If it's more like 500+ GB full, the Samsung would be a better choice. I try to get somewhere between 10% and 20% data coverage (the size of the L2) with any L1/L2 caching task.
Seeing as you have VM files that get used, they would probably run much faster on the Samsung, since it would cache a larger chunk of them over time. Just guessing, but it seems logical.
As you suspected I do use at least half of my 1TB HDD most of the times.
I guess I should stick with 120gb ssd than.
Thank you for the advice