Bratwurst

Looking at Newegg for a bunch of SATA drives. I'm actually going to put together a SAN using 12 of them in a chassis that does RAID 5 with SATA.

So I am looking and I see SATA II and SATA 150. I know what the 150 is, but I havne't seen SATA II before. Can someone explain the difference?

I going to buy 400 GB drives which they I don't see in SATA II anyway, but I just want to try to learn the difference just so I know for the future.

Thanks!

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liquidlight

Have I got my math right here. . . you're building a 3.2 TB RAID 5 SAN?? Jeez. . . that's some serious storage.

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Bratwurst

This is what I am using as a chassis. I was going to use 16x 250 GB drives, but I decided to go with 12x 400GB drives and then have space left for expansion.

http://www.scsi4me.com/?menu=menu_sp...ena_SA8600.htm

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SiN

This thread is GeekPorn™

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Bratwurst

Hilarious. Yes this is true. I'm actually using this as backup storage.

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liquidlight

Don't tell me that this is just for your personal use?

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Bratwurst

No, its for work.

Anyone know the SATA answer?

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bendsley

Sata II drives start at 300mb/s transfer rate. Sata150 is 150mb/s transfer rate.

Over that many drives, I would tell you to consifer RAID 50 or RAID 10 over plain RAID 5.

See link below for explanation.
http://www.acnc.com/04_01_50.html RAID 50 link.
http://www.acnc.com/04_01_10.html RAID 10 link.

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Bratwurst

Raid 10 I would lose half of my drives, I think the fault tolerance in Raid 5 will be enough.

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jonjon42

never can be too careful...(put your tinfoil hat back on)

I would of course make due with a backup server like that....

sorry about the drool...

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Dilbert1234567

well if you have that many drives the chance that 2 will die close to gether is prety high. good luck with it though.

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Bratwurst

It will have three different arrays going though, so I still will have some good fault tolerance.

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bendsley

Just remember that RAID 5 is to protect against mainly 1 drive failing at any given time, for the array to just be degraded. I would tell you to break up that many drives into severaly RAID 5 arrays. Don't put that many drives to a single RAID 5 array. You would be asking for trouble.

Also, remember to have a hot spare or two available incase something happens, you can easily implement it.

As always, tape backup is still a good idea to do nightly.
I'm just giving suggestions. We have a Sun StorEdge 6130 Array that I maintain among other things. It scales from 5 to 112 drives (365GB to 41.2TB). I just don't want you to think I'm just throwing you suggestions and not know what I'm talking about.

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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."

Bratwurst

Well I was going to make 3 Raid 5 arrays, 4 drives each. I'll have room to add one more array of another 4 drives if I need to add space later.

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bendsley

Sounds good then.

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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."