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

[James Harper <james.harper@xxxxxxxxxxxxxxxx>]

> 
> Hello. I'm experiencing solid I/O performance drop when using software
> raid 5 from PV DomU. I can get about 420M/s for sequential reads and
> ~220 M/s for sequential writes when using it from Dom0. But it's only
> ~170 M/s for read and ~80 M/s for write when using it from DomU.
> 
> DomU performance for single drive is close to native â ~160 M/s for
> reads and ~160 for writes.
> 
> There is no filesystem or LVM, just raw data. Debian wheezy x86_64 for
> both Dom0 and DomU. And "phy" backend is used to attach drive to DomU.
> Is this a bug or something wrong with my setup? What should I check?
> 

How are you measuring this performance?

James
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