Comment 51 for bug 1470250

Since I was on holidays, I will give this a try in next two weeks. Thanks for the effort @jalisbury.

> On 20 Nov 2015, at 15:06, Joseph Salisbury <email address hidden> wrote:
>
> I'll see if I can figured out why the 3.10 based kernel doesn't boot.
> However, it may just be easier to test the Precise kernel, which is 3.2
> based.
>
> The latest Precise kernel can be downloaded from:
> https://launchpad.net/~ubuntu-security/+archive/ubuntu/ppa/+build/8272116
>
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> report.
> https://bugs.launchpad.net/bugs/1470250
>
> Title:
> [Hyper-V] Ubuntu 14.04.2 LTS Generation 2 SCSI Errors on VSS Based
> Backups
>
> Status in linux package in Ubuntu:
> In Progress
> Status in linux source package in Trusty:
> In Progress
> Status in linux source package in Utopic:
> In Progress
> Status in linux source package in Vivid:
> In Progress
> Status in linux source package in Wily:
> In Progress
>
> Bug description:
> Customers have reported running various versions of Ubuntu 14.04.2 LTS
> on Generation 2 Hyper-V Hosts. On a random Basis, the file system
> will be mounted Read-Only due to a "disk error" (which really isn't
> the case here). As a result, they must reboot the Ubuntu guest to
> get the file system to mount RW again.
>
> The Error seen are the following:
> Apr 30 00:02:01 balticnetworkstraining kernel: [640153.968142] storvsc: Sense Key : Unit Attention [current]
> Apr 30 00:02:01 balticnetworkstraining kernel: [640153.968145] storvsc: Add. Sense: Changed operating definition
> Apr 30 00:02:01 balticnetworkstraining kernel: [640153.968161] sd 0:0:0:0: Warning! Received an indication that the operating parameters on this target have changed. The Linux SCSI layer does not automatically adjust these parameters.
> Apr 30 01:23:26 balticnetworkstraining kernel: [645039.584164] hv_storvsc vmbus_0_4: cmd 0x2a scsi status 0x2 srb status 0x82
> Apr 30 01:23:26 balticnetworkstraining kernel: [645039.584178] hv_storvsc vmbus_0_4: stor pkt ffff88006eb6c700 autosense data valid - len 18
> Apr 30 01:23:26 balticnetworkstraining kernel: [645039.584180] storvsc: Sense Key : Unit Attention [current]
> Apr 30 01:23:26 balticnetworkstraining kernel: [645039.584183] storvsc: Add. Sense: Changed operating definition
> Apr 30 01:23:26 balticnetworkstraining kernel: [645039.584198] sd 0:0:0:0: Warning! Received an indication that the operating parameters on this target have changed. The Linux SCSI layer does not automatically adjust these parameters.
>
> This relates to the VSS "Windows Server Backup" process that kicks off at midnight on the host and finishes an hour and half later.
> Yes, we do have hv_vss_daemon and hv_kvp_daemon running for the correct kernel version we have. We're currently running kernel version 3.13.0-49-generic #83 on one system and 3.16.0-34-generic #37 on the other. -- We see the same errors on both.
> As a result, we've been hesitant to drop any more ubuntu guests on our 2012R2 hyper-v system because of this. We can stop the backup process and all is good, but we need nightly backups to image all of our VM's. All the windows guests have no issues of course. We also have some CentOS based guests running without issues from what we've seen.
>
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