this post was submitted on 25 Sep 2024
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Hey, remember me ?

I posted about some entreprise SSDs here before, and now I made a full blog post about their insides! With even more pictures!

I hope you enjoy it :)

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[–] [email protected] 27 points 1 month ago* (last edited 1 month ago)

Interesting that the one has such large capacitors in it. I imagine that is as last-ditch effort to keep the board powered long enough to finish flushing all of its caches in the event of a power failure.

That's exactly the point of power loss protection (aka PLP.) As a side effect of not needing to wait for a flush after a write synchronous write workloads are dramatically faster on enterprise drives with PLP.

Edit: To add a bit of detail - you don't need to wait for a flush after a synchronous write with PLP because the drive firmware can lie and immediately return from a flush call because there's enough backup power to complete that flush if the power were cut.