Configuring Raid in VMs

I would like to know if it is needed or even applicapable to configure Disk RAID for Virtual Machines, in Vmware.

for instance if I want to install Exchange server in Virtual environment, then configure Mailbox databases on the RAID5 and Transaction Logs on the mirrored drives.

Is that feasible?

Thanks
jskfanAsked:
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rindiCommented:
If you mean you want to configure RAID inside the VM, then no, that wouldn't make any sense at all. But if you mean whether your datastore that holds the VM's should be RAIDed, then yes of course, that is the only option you should go for. As for the RAID level, I'd only use RAID1 or 10, or maybe RAID6, but not 5, for everything.
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Seth SimmonsSr. Systems AdministratorCommented:
agreed.  any software raid within a hardware raid is asinine, regardless of operating system

don't use raid 5 for any hypervisor; always 10 or 1 (10 preferred)

any exchange installation should have databases on raid 10 and transaction logs on raid 10 or 1 but in this case having the hypervisor on 10 is sufficient for the virtual machine
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jskfanAuthor Commented:
Since the storage is on the SAN.
So, Where do you configure the RAID? is it through VCenter?
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rindiCommented:
I'm not familiar with SAN's enough, but there probably is some control utility that came with the SAN, or with your RAID controller, where the arrays are setup
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
Best practice is to configure RAID on hardware only.  You do not want VMware to be handling software RAID.  Same is true for thin-provisioning, if supported on hardware then always configure it on the hardware only.
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jskfanAuthor Commented:
Which hardware are you referring to ? ESX servers or SAN storage.?

if I understand Nowadays, most of Vmware infrastructures use SAN for storage, ESX servers they are used just to provide resources such as Memory, CPU and and point of Management (Vcenter).

Now when it comes to RAIDs, I would like to know if it is something that's configurable at the Vmware level (Vcenter) or at the Storage level (SAN)

Thanks
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
I am referring to the SAN.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
No requirement to configure RAID in the VM.

Just create VM on your existing data store.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
RAID is NOT configured through VMware ESXi or vCenter Server.

RAID is configured using your Storage Controller or SAN. Once these LUNs are configured, they are presented to the host server.

Using a SAN or Shared Storage is common place among some organisations, because you can use additional features of VMware vSphere, e.g. VMware HA, VMware DRS, VMware FT.

But a SAN is not a requirement for use with VMware vSphere, local storage can also be used, and then VMs could be replicated in real time to another host with local storage for DR.
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jskfanAuthor Commented:
thank you
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