[Cialug] Disk Performance and Measurement

[Nathan C. Smith]

The AoE test is over Gigabit Ethernet with jumbo frames enabled.

I'll look into iozone and CoRAID recommends something called ddt that I will also try.  I'm not even sure how much cache the 3Ware has in it.

-Nate

> -----Original Message-----
> From: cialug-bounces at cialug.org 
> [mailto:cialug-bounces at cialug.org] On Behalf Of Aaron Porter
> Sent: Friday, October 30, 2009 6:57 PM
> To: Central Iowa Linux Users Group
> Subject: Re: [Cialug] Disk Performance and Measurement
> 
> On Fri, Oct 30, 2009 at 2:11 PM, Nathan C. Smith 
> <nathan.smith at ipmvs.com> wrote:
> > I then measured the AoE San performance.  (The Drives are RAID 5)
> >
> > ServerB:~# hdparm -t --direct /dev/etherd/e200.0p1
> > /dev/etherd/e200.0p1:
> >  Timing O_DIRECT disk reads:  548 MB in  3.01 seconds = 
> 182.26 MB/sec
> 
> Over what kind of interconnect?
> 
> > ServerC:~# hdparm -t --direct /dev/sdb1
> > /dev/sdb1:
> >  Timing O_DIRECT disk reads:  1592 MB in  3.01 seconds = 
> 529.53 MB/sec
> 
> O_DIRECT will avoid the system cache, but does this test 
> still fall inside the 3ware's cache memory? Have you tried 
> iozone or similar?
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