Re: [ADSM-L] Maximum throughput with Windows 2003

I do not believe the OS will be a limiting factor.  In the past x86
hardware was an issue due to limited PCI busses, but with PCI Express
that problem should be resolved for the card count you have.  I suspect
your limiting factor will be the number of I/Os per second, if it makes
sense for the app, set you NTFS block size to 64k to match the DMX3.
The highest throughput I have seen from a DMX2000 is around 100 MB/Sec,
which is about half of the 2Gb HBA.
Your throughput will be very dependant on the hyper layout on the disks,
the other traffic on the FA, and how efficient the PCI Express bus
really is.  I would guess you will see 150+MB/sec from a single stream.
I would also say it should be tweakable to go faster.

Do you know what the sustained throughput is for the physical hard
drives?

Andy Huebner
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Kenny
Sent: Tuesday, September 11, 2007 8:58 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Maximum throughput with Windows 2003

Hi Andy,

Thanks for commenting.

I do plan on using PCIe HBA's. I also am evaluating a 4GB VTL. I do not
think the bottleneck will be at the VTL or the disk array (DMX3).

I am trying to determine the single stream performance. If I mount a
single BCV (NTFS) assuming no bottleneck on the disk array or VTL, what
throughput can I expect?

If I mounted 2 BCV NTFS volumes, can I expect a increase in throughput?

I am not sure what the maximum throughput that can be achieved with a
Windows 2003 box versus the maximum throughput that can be obtained with
TSM running on that same hardware?

Thanks,


Pat

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