[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH] block: vpc support for ~2 TB disks
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH] block: vpc support for ~2 TB disks |
Date: |
Thu, 15 Nov 2012 18:00:16 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121016 Thunderbird/16.0.1 |
Il 15/11/2012 17:46, Charles Arnold ha scritto:
>>> We don't use qemu's VHD driver in XenServer. Instead, we use blktap2
>>> >> to create a block device in dom0 serving the VHD file in question,
>>> >> and have qemu open that block device instead of the VHD file itself.
>> >
>> > Yes, the question is how you handle disks bigger than 127GB, so that
>> > QEMU can do the same.
>> >
> In analyzing a 160 GB VHD fixed disk image created on Windows 2008 R2, it
> appears that
> MS is also ignoring the CHS values in the footer geometry field in whatever
> driver they use for accessing the image. The CHS values are set at
> 65535,16,255
> which obviously doesn't represent an image size of 160 GB.
Thanks, this would have been useful in the commit message.
The patch looks good,
Reviewed-by: Paolo Bonzini <address@hidden>
Paolo
> This patch only extends the existing qemu driver to allow a larger image by
> allowing
> more heads. On real hardware, only 4 bits would be allowed for heads but we
> don't
> have that restriction in qemu.