[Ovirt-devel] RFC - Design of new MPATH device menu in o-c-storage

[Mike Burns]

On Fri, Aug 21, 2009 at 10:26:36AM -0400, Joey Boggs wrote:
> Mike Burns wrote:
>> I am designing a new menu to allow a user to select an mpath device for installation without having to drop down to the shell to do setup.  A patch to ovirt-node-image has already been posted to enable multipathd by default.  The new menu will appear as an option under the normal o-c-storage menu.  Not that a few of the open design questions are marked in ??
>>
>> comments are appreciated
>>
>> Work flow for mpath setup
>>
>> o-c-setup menu (choose 1 for storage)
>>
>> Add new option to o-c-storage menu - "Multipath device" that will spawn the new submenu
>>
>> Multipath Device Submenu
>> Display:
>>
>> List of all Block devices for user to selectively choose ? Should 
>> options be toggles, i.e. choose once to enable, choose again to disable 
>> ?
>> ? do we need some way to show whether device is chosen or not (Yes if ^^, no otherwise ?
>>
>> Stay on this menu until either "All" or "Finished" is chosen
>>
>> Other Options
>> Finished - proceed from this menu - fall back to Multipath device menu if no devices chosen
>> Abort - go back to previous menu
>> blank - same menu redisplayed
>> All - Add all devices
>>
>>
>> **Background action**
>> Based on input, blacklist all but the devices chosen in multipath.conf
>> restart multipathd service
>>
>>
>> **New Menu**
>> Display:
>>
>> List of mpath devices with similar format to o-c-storage main menu
>>
>> Other options
>> Abort option to cancel multipath config and return to main menu
>>     ?? should abort cleanup multipath.conf setup ? blank input - 
>> redisplay menu
>>
>> Choose mpath device -> go to standard partition questions
>>
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>>   
> Sounds pretty good, is there maybe a way to build the luns into some  
> kind of display for the user to see like how multipath -ll does without  
> configuring itself, othewise the user will definitely need to know what  
> each of the luns are.
>
> Rather than (like o-c-storage)
> /dev/sda $SIZE $DESCRIPTION
> /dev/sdb $SIZE $DESCRIPTION
> /dev/sdc $SIZE $DESCRIPTION
> /dev/sdd $SIZE $DESCRIPTION
>
>
> to
> mpath0
> \ /dev/sda $SIZE $DESCRIPTION
> \ /dev/sdb $SIZE $DESCRIPTION
>
> mpath1
> \ /dev/sdc $SIZE $DESCRIPTION
> \ /dev/sdd $SIZE $DESCRIPTION


Yeah, I was thinking something like this.  I was going to look at either just parsing multipath -ll output or see if hal maybe has something else that can be used.  That would then be displayed in a similar way to how we display devices in standard o-c-storage menu.

Mike