Re: [Xen-users] Software Raid 5 domu performance drop

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 05/26/2013 02:39 PM, Micky wrote:
> Software raids by design have huge performance hits.
Who told you that? The ARM ASIC on a typical RAID controller has a lot 
less throughput for XOR-ing data than the main CPU in the system, and 
also has a lot less RAM for caching. If anything software RAID is going 
to be faster if you are operating at saturation point.
With hardware RAID you are also suffering the problem that alignment of 
blocks is unknowable, which is relevant when you are trying to align 
your entire block storage stack (especially when the disk is reporting 
512b sectors when they are emulated from 4KB physical sectors).
Gordan

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