On 09/02/2015 11:02 PM, Eric Blake wrote: > On 07/20/2015 11:45 AM, Max Reitz wrote: >> First of all: Thank you, Eric and Berto, for reviewing v3! And thank >> you, Fam, for at least having a peek at it and being confident enough to >> base a series of your own on it. :-) >> >> This series reworks a lot regarding BlockBackend and media. Basically, >> it allows empty BlockBackends, that is BBs without a BDS tree. >> >> Before this series, empty drives are represented by a BlockBackend with >> an empty BDS attached to it (a BDS with a NULL driver). However, now we >> have BlockBackends, thus an empty drive should be represented by a >> BlockBackend without any BDS tree attached to it. This is what this >> series does. > > We've obviously missed 2.4; but now that 2.5 is open, are there plans to > get this series in sooner rather than later? Wen's work on dynamically > adding/deleting children from a quorum would benefit from the ability to > create a BDS without an associated BB, which in turn would help the COLO > work. >
This feature is very useful for COLO. COLO needs the following: 1. adding/deleting children from a quorum dynamically 2. allow references for backing files The BDS without BB only can be created by the monitor command blockdev-add. How to create it in the command line? Thanks Wen Congyang
