Re: ORION num_disks
- From: "LS Cheng" <exriscer@xxxxxxxxx>
- To: "Greg Rahn" <greg@xxxxxxxxxxxxxxxxxx>
- Date: Fri, 12 Sep 2008 17:52:26 +0200
That is pretty impressive!
Largest MBPS I have got so far is around 900 MBPS.
You used 45 for num_disks, was that 45 disks from OS view?
Thanks
--
LSC
On Fri, Sep 12, 2008 at 4:50 PM, Greg Rahn <greg@xxxxxxxxxxxxxxxxxx> wrote:
> Normally it is set to the number of physical drives, but it can be
> adjusted higher or lower depending on how much load you want to drive.
>
> Here is a couple command lines and summary that I used from a Sun
> Thumper(http://www.sun.com/servers/x64/x4500/) for testing I/O
> bandwidth using 1MB reads for a data warehouse workload.
>
> -run advanced -type seq -testname thumper_seq -num_disks 45 -matrix
> point -num_large 45 -num_small 0 -num_streamIO 16 -disk_start 0
> -disk_end 150 -cache_size 0
> Maximum Large MBPS=2668.88 @ Small=0 and Large=45
>
> -run advanced -type rand -testname thumper_rand -num_disks 180 -matrix
> point -num_large 720 -num_small 0 -duration 60 -disk_start 0 -disk_end
> 150 -cache_size 0
> Maximum Large MBPS=1758.35 @ Small=0 and Large=720
>
> On Fri, Sep 12, 2008 at 2:27 AM, LS Cheng <exriscer@xxxxxxxxx> wrote:
> > Hi
> >
> > Does anyone know what value should be used for num_disks argument when
> > running I/O stress tests with ORION?
> >
> > For example consider I have a RAID Group within an EMC Clariion CX-700
> SAN,
> > formed by 8 physical disks and striped using RAID 1+0, then from this
> RAID
> > Group 4 LUN are created and presented to the server.
> >
> > What is the value for num_disks, 8 or 4?
>
>
> --
> Regards,
> Greg Rahn
> http://structureddata.org
>
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