[Qemu-devel] fdisk still shows the "/dev/sdb" partitions even after the removal of scsi disk

[Qemu-devel] fdisk still shows the "/dev/sdb" partitions even after the removal of scsi disk

[chandrashekar shastri]

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Hi,

I have filed a bug "fdisk still shows the "/dev/sdb" partitions even 
after the removal of scsi disk" for the upstream kernel.

Bug link:
https://bugs.launchpad.net/qemu/+bug/1190525

RHEL guest shows the partittions even after the removal of scsi disk:
fdisk still shows the "/dev/sdb" partitions even after the removal of 
scsi disk.

Guest details:
-------------------
Kernel : 2.6.32-358

Host Details :

Upstream Kernel, Qemu, Libvirt and virt-manager
---------------------------------------------------------------------

kernel version : 3.9.0+
qemu version : QEMU emulator version 1.5.0
libvirt version : 1.0.5
virt-install : 0.600.3

Steps to reproduce the issue:

I. Add the SCSI disk through the virt-manager.
2. Create the partition using fdisk (eg: /dev/sbb)
3. Create a filesystem and format using mkfs.ext3 or mkfs.ext4
4. Remove the scsi disk through the virt-manager.
5. Again run the fdisk /dev/sdb, the guests still shows the partition 
even after the removal of the disk.

This issue is not seen with virt-io disk.

This issue is also reproducible without even creating the partitions.

Expected Result:

The output of fdisk /dev/sd* should not show the enties after the 
removal of scsi disks

Thanks,
Chandrashekar



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Re: [Qemu-devel] fdisk still shows the "/dev/sdb" partitions even after the removal of scsi disk

[Laszlo Ersek]

On 06/13/13 12:19, chandrashekar shastri wrote:
> Hi,
> 
> I have filed a bug "fdisk still shows the "/dev/sdb" partitions even
> after the removal of scsi disk" for the upstream kernel.
> 
> Bug link:
> https://bugs.launchpad.net/qemu/+bug/1190525
> 
> RHEL guest shows the partittions even after the removal of scsi disk:
> fdisk still shows the "/dev/sdb" partitions even after the removal of
> scsi disk.
> 
> Guest details:
> -------------------
> Kernel : 2.6.32-358
> 
> Host Details :
> 
> Upstream Kernel, Qemu, Libvirt and virt-manager
> ---------------------------------------------------------------------
> 
> kernel version : 3.9.0+
> qemu version : QEMU emulator version 1.5.0
> libvirt version : 1.0.5
> virt-install : 0.600.3
> 
> Steps to reproduce the issue:
> 
> I. Add the SCSI disk through the virt-manager.
> 2. Create the partition using fdisk (eg: /dev/sbb)
> 3. Create a filesystem and format using mkfs.ext3 or mkfs.ext4
> 4. Remove the scsi disk through the virt-manager.
> 5. Again run the fdisk /dev/sdb, the guests still shows the partition
> even after the removal of the disk.
> 
> This issue is not seen with virt-io disk.
> 
> This issue is also reproducible without even creating the partitions.
> 
> Expected Result:
> 
> The output of fdisk /dev/sd* should not show the enties after the
> removal of scsi disks

What happens if you run "scsi-rescan --remove" or "scsi-rescan
--forcerescan" in the guest? (Paolo had recommended this to me for an
independent problem / case.)

Laszlo

Re: [Qemu-devel] fdisk still shows the "/dev/sdb" partitions even after the removal of scsi disk

[chandrashekar shastri]

On 06/13/2013 06:20 PM, Laszlo Ersek wrote:
> On 06/13/13 12:19, chandrashekar shastri wrote:
>> Hi,
>>
>> I have filed a bug "fdisk still shows the "/dev/sdb" partitions even
>> after the removal of scsi disk" for the upstream kernel.
>>
>> Bug link:
>> https://bugs.launchpad.net/qemu/+bug/1190525
>>
>> RHEL guest shows the partittions even after the removal of scsi disk:
>> fdisk still shows the "/dev/sdb" partitions even after the removal of
>> scsi disk.
>>
>> Guest details:
>> -------------------
>> Kernel : 2.6.32-358
>>
>> Host Details :
>>
>> Upstream Kernel, Qemu, Libvirt and virt-manager
>> ---------------------------------------------------------------------
>>
>> kernel version : 3.9.0+
>> qemu version : QEMU emulator version 1.5.0
>> libvirt version : 1.0.5
>> virt-install : 0.600.3
>>
>> Steps to reproduce the issue:
>>
>> I. Add the SCSI disk through the virt-manager.
>> 2. Create the partition using fdisk (eg: /dev/sbb)
>> 3. Create a filesystem and format using mkfs.ext3 or mkfs.ext4
>> 4. Remove the scsi disk through the virt-manager.
>> 5. Again run the fdisk /dev/sdb, the guests still shows the partition
>> even after the removal of the disk.
>>
>> This issue is not seen with virt-io disk.
>>
>> This issue is also reproducible without even creating the partitions.
>>
>> Expected Result:
>>
>> The output of fdisk /dev/sd* should not show the enties after the
>> removal of scsi disks
> What happens if you run "scsi-rescan --remove" or "scsi-rescan
> --forcerescan" in the guest? (Paolo had recommended this to me for an
> independent problem / case.)
Thanks for the input, I will try out and update the bug accordingly.

Regards,
Chandrashekar
>
> Laszlo
>