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Hooking up SATA drives to SAS controller.

post #1 of 10
Thread Starter 
I'm looking into buying a refurb HP ProLiant server off ebay and I notice a lot of them include HP Smart Array E200/128 Controller, which according to pics has 2 ports for SAS. I think that the mobo for the server I'm looking at has 2 SAS ports as well. But the case supports 6 LFF 3.5" drives or 8 2.5" drives. If I want to populate it with SATA drives is there some kind of special way I need to do this?

This is what I'm looking at buying:

http://h10010.www1.hp.com/wwpc/ca/en/sm/WF05a/15351-15351-241434-241477-241477-1121586.html?dnr=1
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post #2 of 10
It depends on the backplane of the drive bays. More often than not, a raid controller connects to a backplane, and the drives connect to the backplane as well. A SAS port is a quad channel, meaning it can run 4 drives (SAS or SATA, usually). SAS drives have very similar (but still different) connectors than a SATA drive, but most SAS hot swap bays will support SATA drives.

Did you read anything on the page you linked? In the Overview, it clearly states:
Quote:
... dual purpose chassis that can support either the 2.5-inch (SFF) or 3.5-inch (LFF) SAS or SATA drives.

If you are looking to buy a HP ML380 G5, it will support SATA drives interchangeably.
post #3 of 10
Thread Starter 
Of course I did, the question I had more or less was basically, given my limited server knowledge, was how do SATA plugs interchange and adapt to SAS adapters which is what the server emphasizes. I saw it had support for specifics, which I mentioned in my OP which obviously means I read all the product details. What I didn't see was something like "x6 SATA ports" or "x3 SAS / x3 SATA" etc.
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post #4 of 10
Ah, I understand what you are asking now. I guess I read your first post too quickly or something.

Basically, a SAS port allows for 4 channels. That means that 2 SAS port can support 8 SAS or SATA drives. The connector on a SAS and on a SATA drive are very similar that the drive backplane can accommodate for either.

post #5 of 10
Thread Starter 
Perfect, makes sense. Would you call 10k SAS drives reliable OS drives?
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post #6 of 10
Quote:
Originally Posted by Dark-Asylum View Post

Perfect, makes sense. Would you call 10k SAS drives reliable OS drives?

SAS drives are reliable, only because they are considered "server grade". Performance wise, they are faster than 7.2K, but not by much (80-100 IOPS vs 120-150 IOPS).

I would not necessarily call it more reliable just because it's a 10K SAS drive. Any drives in a RAID 1 would increase your uptime, and throw in bare metal backups and you will be fine.
post #7 of 10
Thinking that a SAS drive (regardless of speed) is more reliable than a lesser SATA drive is a recipe for data loss. I've seen some 15k 2.5s fail spectacularly.
    
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post #8 of 10
Thread Starter 
Reason I asked is cause on eBay there are some models of the ML350 I can buy with 2x74gb SAS drives and some without em. I had 2 74GB raptors as my OS drives and one just stopped powering on. Luckily the array was mirrored. I'd hate to put my OS on some overly expensive drives. 74gb SAS drives are ~149.99 on newegg right now. I suppose I'll just save the money and get one without drives and use my own.
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post #9 of 10
For general home usage, there is no need for SAS drives. Waste of money.
    
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post #10 of 10
Quote:
Originally Posted by Oedipus View Post

Thinking that a SAS drive (regardless of speed) is more reliable than a lesser SATA drive is a recipe for data loss. I've seen some 15k 2.5s fail spectacularly.

Yes thank you. More spinny = more faily tongue.gif

Well actually not really but anything that spins at 7.2K RPM let alone 15K RPM is bound to fail at some point.
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