On 1/10/2015 5:13 AM, Daniel Hoffman wrote:
Looking for some guidance/experience with LVM and pvmove.
I have a LUN/PV being presented from a iscsi SAN. The LUN/PV is presented to 5 servers as a shared VG they all have LV's they use for data, they are all connected via iSCSI.
As the SAN I am using is being replaced I need to move onto a new unit.
My migration strategy at this time is to
- Present a new LUN from the new SAN to all machines.
- Make a PV with the new LUN.
- Add it to the existing VG.
- Use pvmove to move all the data from one PV to another.
- Once the old LUN is empty, complete a pvresize to remove the old LUN.
This all seems sound but looking for advice, specifically around the fact that the VG/PV data is being used by a number of machines/servers and the LV's are active on a number of different nodes.
All the documentation/examples I can find assume a disk in a server, not a LUN on a SAN being shared by a number of servers.
only way I'd do that would be to shutdown the other 4 servers, redo the LVM, then bring the other 4 servers back up so they can discover the new LV/PV structures.