Re: [Engine-devel] SharedRawDisk feature detail
On 02/05/2012 02:14 PM, Maor wrote:
...
> 3. "The synchronization/clustering of shared raw disk
between VMs will
> be managed in the file system. "
>
> either i don't understand what this mean, or it could be read with a
> misleading meaning.
Maybe the following rephrase will be more accurate: "The
synchronization/clustering of shared raw disk between VMs should be
based on external independent application which will be synchronized
with the guest application."
"The synchronization/clustering of shared
raw disk between VMs is the
responsibility of the guests. Unaware guests will lead to corruption of
the shared disk."
>
> 4. VM Pools
> VM Pools are always based (at least today) on templates, and templates
> have no shared disks.
> I'd just block attaching a shared disk to a VM which is part of a pool
> (unless there is a very interesting use case meriting this)
If there is no reason to attach shared disk to a VM from pool, maybe its
also not that relevant to attach shared disk to stateless VM.
Miki?
I think pools and stateless are different. I can envision a use case
where stateless guests would use a shared disk (say, in read only for
same data).
>
> 6. future work - Permissions should be added for disk entity
> so who can add a shared disk?
Data Center Administrator or System Administrator will be initialized
with permissions for creating shared raw disk, or changing shared disk
to be unshared.
Regarding attach/detach disks to/from VM, I was thinking that for phase
one we will count on the user VM permissions. If user will have
permissions to create new disks on the VM, he will also have permissions
to attach new shared raw disk to it.
this means they can attach shared disks from other VMs they have no
permission on...
as i said earlier - need to think about this one some more.