using RAID 5 or RAID 6 for Large Exchange 2013 Mailbox LUN

Hi Folks,

For the Mailbox Server role in Exchange Server 2013, which RAID is best to be used ?

RAID 5 or RAID 6 ? I will provision 1.5 TB for holding 750 Mailboxes.

This will be implemented as VMDK (VMware) not a physical RDM presented to the Virtual Machine.

My assumption is that the Data and Logs are hosted on top of this RAID type but on different Virtual SCSI controller (pvSCSI).
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Senior IT System EngineerIT ProfessionalAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
with odd disks, I would do RAID 5.
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dipopoCommented:
Why RAID vmdk disks?
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Senior IT System EngineerIT ProfessionalAuthor Commented:
well the RAID 5 or 6 is the question here, which one should I choose over speed ?

I know that the new version of Exchange does not need to be deployed on top of RAID10 or SAS disk due to the lower I/O requirement.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Do you want to be protected by 1 (RAID 5) or 2 (RAID 6) disks failing?
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dipopoConnect With a Mentor Commented:
Well RAID 6 is slower than RAID 5, as you have 2 parity disks to write to as opposed to 1 parity disk on RAID 5.

Having said that, RAID 6 is more resilient than RAID 5.

http://www.techrepublic.com/blog/the-enterprise-cloud/raid-5-or-raid-6-which-should-you-select/2645/
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Well if that is the case I can just deploy it on RAID 5 because the mailbox server is clustered with DR sites As VM :-)
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dipopoConnect With a Mentor Commented:
Can you give more info on the statement "mailbox server is clustered with DR sites As VM"

I am merely interested. Is this MFC ?
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Senior IT System EngineerIT ProfessionalAuthor Commented:
As usual, the Exchange 2013 Mailbox server role is deployed with Database Availability Group between Production and DR site.
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dipopoCommented:
Ahhh a DAG, yes this is excellent!
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
RAID 5 or RAID6, very little difference in terms of performance, how many spindles are you having in the RAID set?

So, I would base it on disk failure - e.g. RAID 6
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Senior IT System EngineerIT ProfessionalAuthor Commented:
the current disk that I have spare in the EMC VNX array is SATA-II 1 TB 5 units on each sites.

5x 1 TB SATA-II 7200 rpm in VNX5300 production site
5x 1 TB SATA-II 7200 rpm in VNX5500 secondary site
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