From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad@kernel.org>
Subject: Re: LVM Checksum error when using persistent grants
 (#linux-next + stable/for-jens-3.8)
Date: Fri, 7 Dec 2012 09:22:23 -0500
Message-ID: <20121207142222.GA3303@phenom.dumpdata.com>
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To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: xen-devel@lists.xensource.com, Roger Pau Monne <roger.pau@citrix.com>
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On Wed, Dec 05, 2012 at 10:14:55PM -0500, Konrad Rzeszutek Wilk wrote:
> Hey Roger,
> 
> I am seeing this weird behavior when using #linux-next + stable/for-jens-3.8 tree.

To make it easier I just used v3.7-rc8 and merged stable/for-jens-3.8
tree.

> 
> Basically I can do 'pvscan' on xvd* disk and quite often I get checksum errors:
> 
> # pvscan /dev/xvdf
>   PV /dev/xvdf2   VG VolGroup00        lvm2 [18.88 GiB / 0    free]
>   PV /dev/dm-14   VG vg_x86_64-pvhvm   lvm2 [4.00 GiB / 68.00 MiB free]
>   PV /dev/dm-12   VG vg_i386-pvhvm     lvm2 [4.00 GiB / 68.00 MiB free]
>   PV /dev/dm-11   VG vg_i386           lvm2 [4.00 GiB / 68.00 MiB free]
>   PV /dev/sda     VG guests            lvm2 [931.51 GiB / 220.51 GiB free]
>   Total: 5 [962.38 GiB] / in use: 5 [962.38 GiB] / in no VG: 0 [0   ]
> # pvscan /dev/xvdf
>   /dev/xvdf2: Checksum error
>   Couldn't read volume group metadata.
>   /dev/xvdf2: Checksum error
>   Couldn't read volume group metadata.
>   PV /dev/dm-14   VG vg_x86_64-pvhvm   lvm2 [4.00 GiB / 68.00 MiB free]
>   PV /dev/dm-12   VG vg_i386-pvhvm     lvm2 [4.00 GiB / 68.00 MiB free]
>   PV /dev/dm-11   VG vg_i386           lvm2 [4.00 GiB / 68.00 MiB free]
>   PV /dev/sda     VG guests            lvm2 [931.51 GiB / 220.51 GiB free]
>   Total: 4 [943.50 GiB] / in use: 4 [943.50 GiB] / in no VG: 0 [0   ]
> 
> This is with a i386 dom0, 64-bit Xen 4.1.3 hypervisor, and with either
> 64-bit or 32-bit PV or PVHVM guest.

And it does not matter if dom0 is 64-bit.
> 
> Have you seen something like this?

More interestingly is that the failure is the frontend. I ran the "new"
guests that do persistent grants with the old backends (so v3.7-rc8
virgin) and still got the same failure.

> 
> Note, the other LV disks are over iSCSI and are working fine.
> 
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