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Two Questions about SAS

post #1 of 5
Thread Starter 
Hi, I'm building a NAS for personal home use.

I've noticed that there are two types of cards on the market.
First, the way-cheap Per 5/i and 6/i cards which have SFF-8484 connectors.
Second, the super-expensive Lsi 9240/9211 cards with have SFF-8087 connectors.
The 8087 is 3x the price and comes without RAM or a battery.

So, I'm wondering what's the best idea considering I'm going to be hooking it up to a 24/32-port HP multiplier eventually.

My second question is -
Where can I find SFF-8484-to-4xSATA cables that are sleeved, like this:

All I can find is:

Which is too messy to me, since I'm big on cable management.

Thanks for any help, guys!

P.S. Is there a SFF-8484 to 8xSATA cable?

EDIT: And I almost forgot! Do I need the battery/RAM on the card or is not not necessary?
Edited by Track - 4/18/11 at 4:40pm
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post #2 of 5
The PERC card's don't work with expanders IIRC. They can only handle 8 drives -- 4x per SFF-8484 cable. And sleeving your own cables would be the cheaper method to get them that way.
The Byte Mogul
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post #3 of 5
Thread Starter 
Quote:
Originally Posted by spartacus View Post
The PERC card's don't work with expanders IIRC. They can only handle 8 drives -- 4x per SFF-8484 cable. And sleeving your own cables would be the cheaper method to get them that way.
Thanks for the input, but that doesn't really answer all of my questions.

Also, I can't sleeve - doesn't that require tearing about the cable and soldering it back together? That's crazy.
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post #4 of 5
You don't have to take off the connectors to sleeve the cables. The sleeving will have to be large enough to stretch over the connector. The diameter should be just a bit bigger than the diagonal/corner-to-corner distance of the SATA end. The heatshrink will shrink [typically a 3:1 ratio] to cinch the ends so it doesn't slip around.

If the power were to go out on your computer, the BBU keeps whatever is cached on the card until it could write the data. [or the battery runs out] And on my card, the BBU allowed me to enable write-back--the card doesn't wait until it fully writes the data to the HDD. My benchmark speeds went up when I enabled mine.
The Byte Mogul
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post #5 of 5
Thread Starter 
So you're saying BBU is good regardless?

But what happens if I don't have one? What's the advantage of keeping the cached material? I mean, the onboard RAID controller doesn't have a battery.. so why is that good?
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