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TomP

SSD disk cache?

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TomP

Is it possible to set up an SSD disk cache and for security, does it need a second SSD in RAID1, W10 Disk Mirror or DrivePool as all these are available to me and it would also help to understand the pros vs Cons of each method?

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schoondoggy

If you use DrivePool, look at SSD Optimizer.

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TomP
19 hours ago, schoondoggy said:

If you use DrivePool, look at SSD Optimiser.

 

Thanks. Is there any recommendation on the size of the SSDs needed and whether the cacheing process reduces the life of the SSDs?

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Trig0r

Size of the SSD would depend on what files you are throwing around surely?

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schoondoggy
3 hours ago, TomP said:

 

Thanks. Is there any recommendation on the size of the SSDs needed and whether the cacheing process reduces the life of the SSDs?

That would be a good question to ask the Drivepool team. Writing to an SSD is what wears them out. Caching can be write intensive, but many times caching can be read intensive, download a Windows update once and read it many times to all of the computers in your home,

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TomP
On 3/20/2020 at 1:52 PM, schoondoggy said:

That would be a good question to ask the Drivepool team. Writing to an SSD is what wears them out. Caching can be write intensive, but many times caching can be read intensive, download a Windows update once and read it many times to all of the computers in your home,

 

Surely using SSDs to cache read / write to SATA HDDs means that no data is retained but gradually moved to the HDDs, so the Write traffic is constant / high? I didn't think that '"most used" data is retained as in your Win update example - or am I missing something?

 

I did get a reply from Chris (Drashna here) from Stablebit / DrivePool / SSD Optimiser and he has used 128GB drives in his setup and they are "close to 100% wear, but that's after 4-5 years" so performance must have been dropping for some time before that.

 

Now I'm beginning to understand what I'm looking for, I found an excellent YouTube video explaining the difference between Samsung QVO (=QLC) and EVO (=TLC) and contrasted lifetime with earlier (Pro) MLC that gives best wear out (= highest TBW) with each later generation successively halving the TBW spec and is reflected in the warranty Samsung offer...

https://www.samsung.com/semiconductor/minisite/ssd/support/warranty/

 

Looking on Amazon, Samsung 850 Pro 256GB is 5-year warranty 300TBW MLC price £79.49 compare to 960 EVO 3-year 100TBW 250GB warranty TLC at £53.99. This seems to be a reasonable price to pay for higher warranty / TBW, whilst also twice the size of the drives used by Chris.

 

The cheapest TLC equivalent I can find is Crucial BX500 250GB at half the price but only 3-year 80 TBW warranty,  so I think the Samsung 850 Pro is best for this seemingly high-write caching application.

 

Feedback on my logic would be much appreciated. Thanks

 

 

 

 

 

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