On 12/01/2015 06:35 PM, Gordon Messmer wrote:
On 12/01/2015 06:43 AM, Roberto Ragusa wrote:
>> ... should note that you'll have to shrink at least one of your volumes,
though. The encrypted PV that you create will be slightly smaller than it was, before
encryption. As a result, there won't be enough extents to move all of the volumes off
and then back.
> The PV is used in multiple of the segment size, so, depending on rounding errors you
may
> have some free blocks.
Sounds right. "pvdisplay" will print information about unusable space in the
"PV Size" line. As long as that's larger than the LUKS header (2MiB, I
believe) you should be able to do a live migration to an encrypted PV using a second
disk.
Interesting.
And one can do it on purpose:
- big segments (64MiB)
- partitions with a little overhead (100.01GiB, so there are 10MiB of extra room)
- PV, mdadm or luks headers will never be a problem
--
Roberto Ragusa mail at robertoragusa.it