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On 10 March 2014 18:54, Chris Friesen <chris.friesen at windriver.com> wrote:
> On 03/08/2014 02:23 AM, ChangBo Guo wrote:
>>
>> Are you using  libvirt driver ?
>> As I remember,  the way to check if  compute nodes with shared storage
>> is :   create a temporary file from source node , then  check the file
>> from  dest node , by accessing file system from operating system level.
>> And boot from volume is just a way to boot instance , not means  shared
>> storage  or not .
>> For non-shared storage , have you try  block migration  with  option
>> --block-migration ?
>
>
> Using block migration does seem to work.  However, it passes
> VIR_MIGRATE_NON_SHARED_INC to libvirt in the migration flags, which doesn't
> seem ideal for boot-from-volume.   I assume it starts to do an incremental
> copy but then decides that both are identical?
>
> This raises an interesting question.  Why do we even need the user to
> explicitly specify --block-migration?  It seems like we could just test
> whether the instance storage is shared between the two compute nodes and set
> the appropriate flags automatically.

+1 it does seem like we could auto detect this if its not specified.

John