Re: [Xen-users] 4KB Sector Disks

[James Harper <james.harper@xxxxxxxxxxxxxxxx>]

> > domU is Windows.
> 
> Does Windows know about 4k sectors, or does that end at #3? I can
> imagine that doing a read/modify/write for each 512 bytes written would
> kill performance.

http://support.microsoft.com/kb/2510009

>=8/2012 can handle native 4kb sectors
<8/2012 knows how to handle alignment for 512e but not 4kb sectors

There was a patch recently for vbd to advertise physical sector size... without 
that I'd be a bit nervous about actually using even 512e in case windows makes 
incorrect assumptions about the underlying alignment.

James

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