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Should I consider less, but larger drives for my RAID 5?

Posted on 2007-08-01
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Is it better to have less larger disks in a RAID 5 or more smaller disks, and why?

I'm considring an HP ProLiant ML350. It has been offered to me containing eight 146 GB SAS drives.
Two RAIID1 for OS.
Six RAID5 for data.

Should I consider less, but larger drives for my RAID 5?





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Question by:jpertchik
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andyalder earned 200 total points
ID: 19610499
More small ones, the more spindles the faster it is, each disk can be doing I/Os at the same time. You should also consider RAID 1+0 for the data as well as the OS if you can afford the reduction in data size since that will also be faster. Also if you wantd larger drives than the 147GBs you'd have to go for 3.5" inch ones and you can only get 6 of them in a ML350 rather than 8 2.5" ones.
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by:jpertchik
ID: 19611090
I hear ya.

What have you heard about thr ML350? Good/bad/indifferent?

What have you heard about the HP Storage Works D2D110 backup System?

As this is a major investment for my company (we are relatively small) I'm trying to gather as many opinions as possible.

Thanks!
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by:andyalder
ID: 19611489
ML350 G5 is solid as a rock; ML370 G5 is also a good bet, slightly more expensive but can be upgraded to 16 disks if you need more in the future.

D2D110 isn't as reliable as the ML300 series but if it's only for backups then it's reasonably priced. You can hardly take it off-site though in the event of a disaster so you still need something that's portable. Normally I would advise on tape since you can drop them and they still retain the data but on a budget you can get away with a couple of USB harddisks to backup onto, taking one off-site each day.

Don't buy off the web, it's the full retail price; talk to a reseller instead, they might be able to arrange leasing instead of purchase if you're short of money although it's obviously more expensive in the long run.
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by:jpertchik
ID: 19611528
We won't need to upgrade. By time we outgrow this one, I'll be onto a new machine. We are not running much in terms of application on thsi machine. It is primarily a file server/print server and also is a license server for AutoCAD. I'm considering dual quad-core drives. Does that seem like over kill? One single quad-core, or two core duo? What is my best bet?

Thanks!
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by:jpertchik
ID: 19611541
Oops! I meant to say Dual Quad-core processors!
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by:andyalder
ID: 19611681
Single bottom of the range CPU is file for file and print server, 5120 would be plenty although I'd probably get a 5130 since there isn't much price difference and they use the same watts.

They come with 1GB RAM, I would add another 2GB since the OS can use this as file cache, don't go up to 4GB since you'll only see 3.5GB without a lot of messing about to get past the memory that's overlayed by the PCI bus/chipset.
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