Thanks for the answer Skylar!

Offset, alligment or diskcrossing problem is an Intel architecture
problem hitting both Linux and Windows. In Windows you can use diskpar
or diskpart to overcome it. EMC have an white paper "Aligning GPT Basic
and Dynamic Disks For Microsoft Windows 2003".
However, we lazy uneducated Windows administrators don't tend to care
about it if we cant use a GUI...


//Henrik


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Skylar Thompson
Sent: den 23 juni 2008 16:26
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Server stgpool volumes and GPT

Henrik Vahlstedt wrote:
> Hi,
>
> What evidence do you have that MBR volumes have better performance 
> than GPT volumes on Windows?

I've run into offset problems with DOS partitions on Linux, where the
offset forces every write at the filesystem level to be written to two
stripes rather than one. You can fix this with the "x b" command in
fdisk, or use LVM which doesn't have an offset.

I don't know if this is related to MBR/GPT on Windows though.

--
-- Skylar Thompson (skylar2 AT u.washington DOT edu)
-- Genome Sciences Department, System Administrator
-- Foege Building S048, (206)-685-7354
-- University of Washington School of Medicine


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