Re: [Xen-users] SW RAID powered Xen node - knowledgeable feedback much needed

[John Madden <jmadden@xxxxxxxxxxx>]

> Adding HW raid would mean an 60% price increase which would lead to 60%
> more VEs on the node. Would the 60% increase in VEs count but with HW RAID
> be preferable over the SW RAID with less VEs?
Why would adding hardware raid result in a 60% increase in guests?  HW 
RAID won't necessarily perform any better than SW RAID -- particularly 
depending on your workload -- so I wouldn't count on being able to load 
up more i/o.  I think Linux's software RAID is great, I've used it for 
years, I've done things like mirror a local SATA disk to a remote iSCSI 
disk for better cross-box redundancy, I've booted from it, run VMs from 
it, etc., but I would still almost always prefer hardware raid as long 
as we're talking about a decent (LSI, Mylex, Intel, Adaptec) controller.
John




--
John Madden
Sr UNIX Systems Engineer / Office of Technology
Ivy Tech Community College of Indiana
jmadden@xxxxxxxxxxx

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