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SAS 9211-8i - turn on disk cache policy?

post #1 of 6
Thread Starter 
Hello,

I bought this thing in order to bypass my sata 3 ports, turns out I get the exact same performance, except sequencial writes/reads are faster. However in my line of work IOPs is far more important. I'm not raiding drives, just streaming big files from 8 different SSDs. I read I can turn on Cache somehow to improve the performance, is this possible and is there a risk?

http://www.tomshardware.com/forum/281708-32-slow-write-speeds-raid-controller-card
http://www.thessdreview.com/forums/threads/no-disk-cache-option-available-lsi-9265-8i.1221/


Specs:

UD5 x79 GA
3930k

If not then Im probaly just going to upgrade to Skylake X and call it a day, no sense in investing in a more expensive 400 dollar adapter.

Thanks!
Edited by Dracarys - 9/28/17 at 12:38am
post #2 of 6
Thread Starter 
Can I add a battery/cache to this thing?
post #3 of 6
I'm assuming this is your card? https://www.newegg.com/Product/Product.aspx?Item=N82E16816118112

If so, this card there, while claiming to be a "Raid Card" is actually not an "Actual raid card". It does not have any onboard memory what so ever, and does not support connecting a BBU (Battery Backup Unit / Battery). As such this is just a HBA or "Host Bus Adapter" and not a "Hardware Raid Card". As such there are no caching options, and no battery-backed caching options. That's most likely why it's so cheap. Usually cards that do have these options are $400+

EDIT: Yep right there in the description it says it on the newegg page, it's just a "HBA", not a real raid card.
post #4 of 6
Thread Starter 
ok thanks, no point then, should just upgrade to skylake x and call it a day, what a bad investment that was, could have just used my marvel ports with the same performance. luckily it was only 100 bucks.
post #5 of 6
Thread Starter 
Would this be better? It's selling for 200 Canadian in my city, 2gb cache. I'm only trying to use JBOD, no raiding, simply streaming samples (big files) from each separate SSD, simultaneously:

https://www.newegg.com/Product/Product.aspx?item=N82E16816118217

Not sure if I need a battery for that.


edit - NVM there's no cache on this either, read that wrong!
Edited by Dracarys - 10/7/17 at 10:35pm
post #6 of 6
Quote:
Originally Posted by Dracarys View Post

Would this be better? It's selling for 200 Canadian in my city, 2gb cache. I'm only trying to use JBOD, no raiding, simply streaming samples (big files) from each separate SSD, simultaneously:

https://www.newegg.com/Product/Product.aspx?item=N82E16816118217

Not sure if I need a battery for that.


edit - NVM there's no cache on this either, read that wrong!

By the way if you're not running a hardware raid mode, then having a cache is pointless because only an exported raid array can get cached, JBOD mode will never be cached on any controller. That's just not how they work.

Also: Anything that says "HBA" is non-raid, non-caching.
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