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Raid recommendation

post #1 of 13
Thread Starter 
setting up a server with maybe 3 1tb hard drives (F3s probably)
should i go 4 1tb and do Raid 1 or stick with 3 and do Raid 5?

i heard bad feedback from the poor write speed on Raid 5.
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post #2 of 13
Well it depends on what you're using it for.

So, what you using it for?

Comps
post #3 of 13
Raid 1 and Raid 5 are very different setups.

You should first mention why you want to raid, are you after redundancy or a performance increase?


Edit: Damn you compuman145 *shakes fist*
post #4 of 13
You got to get up earlier than that to beat me,

I'm hungover as well. :-p

C
post #5 of 13
Thread Starter 
its for a server. im pretty sure its IOPS intensive along with hard files. would have gone with the SSD route but way too expensive.

im just throw the raid idea at my boss to make it easier on us. we manually back up the data...
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post #6 of 13
Right I understand it's for a server. But this is what I need to know, is it used for data storage or for an operating system. You do NOT want to put an operating system on a RAID5 array, if you have a disk failure your OS will fail along with it.

So, in sort, for an OS use RAID1, for pure data storage use RAID5.

What you need to remember, a server isn't just for speed, it's for solid, reliable and cost effective data storage. You shouldn't EVER put SSD's into a RAID5 array for lots of people to read/write from it in a corporate environment.
Edited by compuman145 - 10/21/11 at 3:35am
post #7 of 13
Thread Starter 
Quote:
Originally Posted by compuman145 View Post
Right I understand it's for a server. But this is what I need to know, is it used for data storage or for an operating system. You do NOT want to put an operating system on a RAID5 array, if you have a disk failure your OS will fail along with it.

So, in sort, for an OS use RAID1, for pure data storage use RAID5.
omg for some dumb reason i didnt realized that the OS has to be active at all times.. thanks for clearing that up.
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post #8 of 13
Quote:
Originally Posted by Coolwaters View Post
omg for some dumb reason i didnt realized that the OS has to be active at all times.. thanks for clearing that up.
You're not kidding are you....

Ok, here's what you do. Go get 6 drives, use 2xRAID1 array and 3xRAID5 array and 1 as a hot spare for your RAID 5 array.

The reason for the hot spare is you won't need to shut the server down to replace disks. Also, in the even of a double failure then you might be able to salvage the drive.

Comps
post #9 of 13
Thread Starter 
Quote:
Originally Posted by compuman145 View Post
You're not kidding are you....

Ok, here's what you do. Go get 6 drives, use 2xRAID1 array and 3xRAID5 array and 1 as a hot spare for your RAID 5 array.

The reason for the hot spare is you won't need to shut the server down to replace disks. Also, in the even of a double failure then you might be able to salvage the drive.

Comps
only raid experience i had was a simple 2 drive raid 0 for a week with my vertex. thats was pretty much it =/
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post #10 of 13
Mmmmmk,

I would go with what I recommended, the OS will be safe and redunant to a single drive failure on the raid1 array, your RAID5 array will be rundandant to 2 drive failures as long as it has time to build the hot spare disk.

This is the most cost effective, reliable solution. Your only other option is going to be a 1+0 array, you'll be looking at a minimum of 6 disks (purely for the storage space) and you'll end up with 3TB of available disk space, you'll need to partition the drive with a system drive and a storage drive. The downside is you're sharing the array with the storage. Doing the raid5 array is just the best way to do it.

If you really wanted to, you could get cheaper disks for your system partition, you could even go as far as using blue/green drives for storage and use 2tb disks.

Comps
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