Ok, thanks for the prompt reply and the notice for the cc: :)
I'm using libata and ata_piix now.
My disk is seen as "sda" and a lshw is reporting the controler as using "ata_piix" :
# lshw -c STORAGE
*-ide
description: IDE interface
product: 82371AB/EB/MB PIIX4 IDE
vendor: Intel Corporation
physical id: 7.1
bus info: pci@0000:00:07.1
logical name: scsi0
logical name: scsi1
version: 01
width: 32 bits
clock: 33MHz
capabilities: ide bus_master emulated
configuration: driver=ata_piix latency=0
But fdisk always recognize the disk as 136.8Gb :
# fdisk -l
Disk /dev/sda: 136.8 GB, 136899993600 bytes
16 heads, 63 sectors/track, 265260 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Disk identifier: 0xd7267427
Device Boot Start End Blocks Id System
/dev/sda1 * 1 204 102815+ 83 Linux
/dev/sda2 205 2236 1024128 82 Linux swap / Solaris
/dev/sda3 2237 20805 9358776 83 Linux
Here is the new kernel config file : http://pastebin.com/f65fd472b
-----Message d'origine-----
De : linux-kernel-owner@xxxxxxxxxxxxxxx [mailto:linux-kernel-owner@xxxxxxxxxxxxxxx] De la part de Mikael Pettersson
Envoyé : jeudi 17 décembre 2009 10:28
À : Romain Kubany
Cc : linux-kernel@xxxxxxxxxxxxxxx
Objet : Re: Possible regression of LBA48 support for piix
Romain Kubany writes:
> Hello,
>
> We are using Microsoft Hyper-V Virtualization technology for some of our GNU/Linux guests and we recently discovered
> that the emulated hardware does not seem to support LBA48 adressing on IDE controller.
>
> After some tests, here are the results on a VM with a 200GB virtual disk : disk is detected as 214748MB up to kernel 2.6.27.41 and as 136899MB in 2.6.28 and up.
>
> The two kernels (2.6.27.41 and 2.6.28) were compiled with approximatively the same parameters (just an oldconfig between them, I'll paste a line to their respective config at the end of the mail)
> except that many changes occured in IDE management between 2.6.27 and 2.6.28 series of the kernel so it is possible that the problem is coming from a misconfiguration on our side (in which case I'll present you my truthful apologies for making you waste your time).
>
> Here are some useful informations (I think) for start :
>
> [On the "working" kernel, 2.6.27.41 w/ 200GB recognized vdisk]
>
> # hdparm -I /dev/hda
Try using libata and ata_piix instead of the old IDE drivers, but
be aware that the disk will show up as /dev/sda not /dev/hda.
Also, IDE/ATA-related issues should be cc:d to linux-ide (see MAINTAINERS).
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