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

On 5/26/2013 8:39 AM, Micky wrote:
Software raids by design have huge performance hits. I won't really
use dmraid in production.

Raid 5 also has significantly more more I/O delays & performance hits since a single Write usually causes two Reads, then processing, finally two Writes. It gets even worse when sync'ing or if something waits for the the operation to complete before continuing.

Anyone using S/W raid (and sometimes even with h/w raid) is better off using Raid 1 or Raid 10 if you are concerned with performance.


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