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jgsilvatel

12 Posts

1367

February 4th, 2011 04:00

Raid 1 and Raid 10

Hello, I'd like to know the advantages about raid 1 and raid 10 about spindle, cost, iops.

A example: for database, what's is more interesting: Raid 1 or 10 ?

tkjoffs

159 Posts

February 4th, 2011 05:00

RRR has a great passion for Raid 1/0; and rightly so. That said, I will add a little for you:

  1. Raid 1
    1. Mirroring of data so that each disk in the pair has identical data sets.
    2. Not really expandable.
    3. Great for Write & Non-Sequential data loads.
  2. Raid 1/0
    1. Mirrored & Striped.  Gives you a little extra in data integrity in case of a drive failure and perhaps a bad sector on the other disk.  Better but you get the drift...
    2. Expandable - As RRR Pointed out. - THIS is your friend.  For databases, this can save your neck on the right occasion.
      1. Allows for more space to be added.
      2. Allows for greater I/O to be added.
    3. Pretty & Impressive - VP-Level+ Types love to be wowed with new versions of everything so when you tell your VP-Level you are going with Raid 10 as opposed to 10 because it is the newer and better standard, you might even be able to get a little extra cash for some extra spindles.

Really, you do lose just a touch of disk space on a 1/0 set, but not enough to worry about the cost to the pocketbook.  Always go with the extra (albeit tiny) protection that the stripe gives you.

TJ

RRR

2 Intern

 • 

5.7K Posts

February 4th, 2011 04:00

Always make it a RAID10 !! Even with 2 disks, the Clariion allows you to call that a R10 ! R10 has the advantage that you'll have more IOps available as with a traditional R1, you'll only have the IOps of just 2 disks.

Even if you start with a 2 disk R10, when you run out of IOps, simply add an even number of disks to this raid group (and expand it) and the LUNs on that RG will profit from the extra IOps the extra disks added to the RG.

kelleg

4.5K Posts

February 4th, 2011 08:00

Please remember to mark the question Answered and to award points to tbe person providing the correct answer

glen

christopher_ime

2K Posts

February 5th, 2011 16:00

Just wanted to point out that there is one use case where you are limited as to the use of RAID 1/0, and that is for any Navisphere/Unisphere LUNs being presented to a Celerra which only supports RAID 1/0 (1+1) 2 disk configurations as noted in the "NAS Support Matrix".

RRR

2 Intern

 • 

5.7K Posts

February 7th, 2011 02:00

Thanks !

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