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

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).


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