On Friday, 23.10.2015 at 11:09, Vincent Schwarzer wrote: > > blkfront detached: node=device/vbd/51712 > > blkfront: node=device/vbd/51712 > backend=/local/domain/0/backend/qdisk/8/51712 > > Failed to read /local/domain/0/backend/qdisk/8/51712/feature-barrier. > > blkfront: 764 sectors > > What is this error about? Has this something to do how the mounting of > images work described in " *Fs-utils: File System Access Tools for > Userland" *?
It's not an error, the messages from the Mini-OS blkfront driver are confusing. What it's saying is "feature-barrier is not supported". It'd be nice to clean up the messages (and reduce verbosity) at some stage. Another annoying thing is the multiple attach-detach-attach dance for each blkfront device, the reason it does that is because the etfs/blkfront glue layer opens and closes the device multiple times during init. I had a look at the code some time ago but couldn't see any straightforward way of fixing it. Martin
