Entreprise SSDs are something else – Krafting's Lab (blog.krafting.net)
from Krafting@lemmy.world to selfhosted@lemmy.world on 25 Sep 17:14
https://lemmy.world/post/20177542

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 :)

#selfhosted

threaded - newest

dual_sport_dork@lemmy.world on 25 Sep 17:46 next collapse

Crikey. I have to wonder what that ~2TB unit must have cost in 2016.

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.

Krafting@lemmy.world on 25 Sep 18:01 next collapse

I don’t even want to think about prices ahah, I could have done some research and talked about it on the article tho…

And yeah that is probably why

dual_sport_dork@lemmy.world on 25 Sep 20:47 collapse

I can only conjecture it must have cost a mint.

seaQueue@lemmy.world on 25 Sep 18:06 collapse

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.

MigratingtoLemmy@lemmy.world on 25 Sep 18:01 next collapse

Thank you

Schlemmy@lemmy.ml on 25 Sep 18:46 next collapse

Great post!

Krafting@lemmy.world on 25 Sep 19:12 collapse

thank you!

tmjaea@lemmy.world on 26 Sep 18:46 collapse

Yes, some chips (or rather parts of all chips) are spare on enterprise SSDs. You can even see how much is left via smart data