My current server is using a 128GB SSD caching for a 1t 5400 rpm drive. Right now i am at about 400GB of data on that combination, and the SSD is sitting at about 50-60% utilization. which is about as expected as some of the data is touched infrequently and some of it is used all the time.

So i would say it is performing pretty well for my current desired use. I am tempted to set this sort of configuration up in a desktop/laptop scenario and seeing how it works there.

On Fri, Oct 28, 2016 at 12:07 AM, Michael Butash <mike@butash.net> wrote:

Good to know - I was contemplating doing this with some spinners in it for bulk storage, as I have some 2tb's left over now. Peeling off some of those 512's to cache for the spinners might make them more useful so I don't have to burn space on the ssd's exclusively.

How much ssd do you end up using per tb of space? I don't want to lose a lot of space on the ssd's, and plan to run the base os and usr/home space from ssd, really I just want to back vm space if necessary on them.

The other thought was just using memory as a tmp cache with ramdisk. I'm going into it with 128gb as only having 32 has been causing me issues lately. If the caching doesn't require more than say 32gb, might be interesting to try caching to tmpfs instead. Been a notion of mine to try for grins.

-mb

On 10/27/2016 05:42 PM, Stephen Partington wrote:

I still want to try dmraid-1 plus nvme drive with lvmcache.

PS SSD based lvmcache has been running well for me.

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