Decided to up the L2 to 16GB because I have the space. There hasn't been much activity today because I am tinkering with other things, but here is the current view.
Is what I have set for the block size, deferred write and prefetch etc. appropriate? The block size defaulted to 32KB but the drive's cluster size is 4KB. If I change it to 4KB PrimoCache estimates a 2.32GB memory overhead, vs the 297MB at 32KB. Is it worth changing it to something in between?
Annotation 2019-07-02 154228.png (23.57 KiB) Viewed 14444 times
I would do 16KB block size, and format the hard disk to 16KB cluster size if possible. Not super important though for a downloads cache. I just use whatever keeps the overhead below 1GB of ram because at that point you're just losing performance from not being able to dedicate that ram to L1 cache.
Cool, changed it to 16KB and it says the overhead is 594MB
When you say format the disk, you mean the 2TB one? If so, don't have the capacity elsewhere to dump the data whilst I do that lol. I may do in a month or two, so could do it then
Yeah the 2TB one. Not that important for your setup though because I doubt the L2 cache will have much work to do for you. With matched block/cluster size I find ssd L2 cache performance to be 95% of native ssd performance, with a bigger block size than cluster size speed drops to maybe 85% of native ssd performance.
I think in your case you may just set L2 cache 100% read in order to prevent too much wear by write caching. If the D drive is only used for downloading, then I think 8GB RAM is enough and L2 cache is not necessary.
