disk migration to a new host?

[dormando]

Brandon Ooi wrote:
> Hi,
> 
> We've been using Mogilefs for a long time now and it's been working out 
> great! (the "new" drain/rebalance stuff is awesome!). Quick question for 
> anybody who has tried this.
> 
> We are migrating datacenters and I was wondering if it would be possible 
> to "migrate" disks. For example:
> 
> * mark dev1 as down
> * copy (or physically move) the dev1 disk to the other datacenter.
> * change the host that dev1 is on (devices table)
> * mark dev1 as up?
> 
> Any experience or input would be appreciated. Thanks!
> 
> Brandon

There might be an edge case I don't know of, but that should work... I'd 
actually recommend marking the _host_ and devices as down and moving it 
wholesale, if you have enough hosts.

And I assume your new/old DC's are connected via L2 somehow? There'll be 
a lot of cross traffic if you simply mark them as up again at the new 
DC, while continuing to run at the old one.

-Dormando