Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Maximun (or suggested) hard disk numer in a raid 6

Posted on 2016-10-13
4
Medium Priority
?
23 Views
Last Modified: 2016-12-08
Dear experts,
i've a customer with a eternus fujitsu dx 100 SAN. Actually he has a raid6 with 8 hard disk SAS 10K 600 Gb, i Should add 8 hard disk to this raid. It is an elevated number of hard disk in a single raid . Do you think that i can have some problems ? Are there some best practices about the optimal number of hard disk in a raid
0
Comment
Question by:tachimiri
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
4 Comments
 
LVL 88

Assisted Solution

by:rindi
rindi earned 664 total points (awarded by participants)
ID: 41842156
The limiting factor is what the raid controller supports, and the number of disk bays you have available. More disks in an array will normally speed up the array, as there are more spindles. On the other hand, since RAID 6 allows for 2 disk failures at the same time, maximum, chances are higher that 2 disks will fail at the same time. So you should at least take more care with monitoring the state of the array, and also have spare disks on site so you can replace a bad disk as soon as it goes bad.
0
 
LVL 17

Accepted Solution

by:
Gerald Connolly earned 672 total points (awarded by participants)
ID: 41843205
A rule-of-thumb from the past was that 7-10 disks in a RAIDset was the useable maximum even though controllers typically allow a maximum of 16-32. This relates to the fact that if a disk in RAID-5 or RAID-6 fails, all the other disks in the RAIDset need to be read for the XOR to recover the data for the missing disk.
0
 
LVL 56

Assisted Solution

by:andyalder
andyalder earned 664 total points (awarded by participants)
ID: 41843697
There's no RAID 60 option with that model so it's either RAID 6 or RAID 50, can't find any recommended maximums from Fujitsu so I'd stick to Gerald's recommendation and keep the number of disks in the RAID set at 8 meaning you would create another RAID 6 set with the new disks. This has the added benefit of allowing you to use higher capacity disks as 900GB and 1.2Tb are probably available for it.
0

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

We look at whether swapping a controller board on a failed hard drive is likely to solve the problem.
Compliance and data security require steps be taken to prevent unauthorized users from copying data.  Here's one method to prevent data theft via USB drives (and writable optical media).
This video teaches viewers how to encrypt an external drive that requires a password to read and edit the drive. All tasks are done in Disk Utility. Plug in the external drive you wish to encrypt: Make sure all previous data on the drive has been …
This tutorial will walk an individual through the process of installing the necessary services and then configuring a Windows Server 2012 system as an iSCSI target. To install the necessary roles, go to Server Manager, and select Add Roles and Featu…

715 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question