Re: [Xen-devel] Handling iSCSI block devices (Was: Driver domains and device handling)

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On 14/12/12 19:26, Ian Jackson wrote:
> Roger Pau Monne writes ("Re: Handling iSCSI block devices (Was: Driver 
> domains and device handling)"):
>>  * remove: called to disconnect the device. Xenstore backend entries
>> exists, and backend state is 6 (XenbusStateClosed).
> 
> I assume we need an unprepare here too.

I've also thought that, but the reason for prepare to exist is to reduce
the time that the "add" operation takes, thus reducing the blackout
phase during migration.

There's no such problem in the remove phase, but I guess we need an
unprepare in case there's a failure between the prepare and add
operations, and we wish to give the hotplug script an opportunity to
unwind whatever the prepare operation has done.


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