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

[braintorch <kkabardin@xxxxxxxxx>]

26.05.2013 17:47, James Harper ÐÐÑÐÑ:
> > So, writing without caching is almost the same. Reading is halfed in
> > compare to dom0, but this is not really an issue to me.
> > Is there a way to optimize DomU caching to boost write speed?
> I think you wouldn't want to do this if you value your data. Maybe dom0 just 
> has more memory than domu?
>
> Are you saying that raid5 has a specific problem or is this just what you 
> happen to be using? Can you do some other tests with just a single harddisk 
> passed through to domu? And maybe a raid1 too?
>
> James
Actually, dom0 have 512 Mb memory vs DomU with 1024 Mb. I have done some 
tests with single drive, raid1 and raid10. Results in DomU almost 
identical to those in Dom0. Only raid 5 setup have the difference.
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