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One array vs Two arrays

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scott_417
Frequent Advisor

One array vs Two arrays

If I have 6 disks in the enclosure, I put Disk 1 and Disk 2 in Array #1 (for RAID1) and Disk 3 to Disk 5 (for RAID5) in array #2.

What are the pros and cons between putting all the disks in one array, and in two different arrays?


Thanks to help.

Scott
2 REPLIES
Steven Clementi
Honored Contributor
Solution

Re: One array vs Two arrays

Scott:

In one array:

Pros:
You get more available space for RAID5
You get better I/O performance due to more spindles handling your data

Cons:
More potential for possible failure (going back to your car theory, 1 car on the highway is less likely to have an accident where as 6 cars on the same highway is more of a potential for an accident)

In 2 arrays:

Pros:
You separate I/O streams potentially giving you better performance
Multiple disk failures might not effect you.

Cons:
Less space overall unless you use all RAID1


I am sure there are more, but these come to mind very quickly.


Steven
Steven Clementi
HP Master ASE, Storage and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5)
RHCE
NPP3 (Nutanix Platform Professional)
Oleg Koroz
Honored Contributor

Re: One array vs Two arrays

make it as a duplex, Channel 1 and Channel 2
find chapter: Server Cabling

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00292624/c00292624.pdf