Storage overwrite/delete policy

Roman Rakus rrakus at redhat.com
Wed Apr 3 12:26:10 UTC 2013


I don't understand all that about storage, but I agree there should be 
some warning/fail if device is used.

RR

On 04/03/2013 01:03 PM, Jan Safranek wrote:
> Hi,
>
> I'm polishing my storage provider and I want to discuss policy when the
> provider deletes or overwrites something.
>
> I propose:
>
> A block device can *not* be deleted or overwritten (added to MD RAID,
> formatted with a filesystem, formatted as physical volume etc) if and
> only if:
> - There is a filesystem on the device and the filesystem is mounted.
> - Or, any other block device depends on it (Blivet knows this):
>    - The device is member of a running MD RAID.
>    - The device is member of a running volume groups.
>    - The device is formatted as LUKS and the LUKS is opened.
>    - (I haven't tested, but I suppose) The device is path of running
> multipath device.
>
> In these cases OpenLMI storage provider returns an exception
> (ERR_FAILED), with description that 'Device %s is still used.'
>
> All other devices can be deleted or overwritten. That includes (but is
> not limited to):
> - Device with unknown filesystem.
> - Device with MD RAID metadata, which is not running.
> - Device with physical volume metadata, but not part of any running VG.
> - Device with a filesystem, which is not mounted.
>
> Does this make sense?
>
> Jan
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