Il 12/06/2012 19:20, James Bottomley ha scritto: > I don't think you understand how persistent reservations work. > > The first thing I'll say is I agree with Alan. Unless you can justify > why you want to relax permissions I'm not going to do it. See my answer to John. The reason is that I want to let VMs use persistent reservations without running them as root. > But secondly, the reason we're so up in arms about SCSI-3 PR is that > there's a feature called reservation by transport ID. This is used to > reserve multipath devices when one of the paths is down. Effectively it > allows a PR-OUT command to set a reservation on any LUN with access only > to one of them. It's definitely a hack in the SCSI standard, but it's > not one that can be controlled by a unix like permission model. Write > access to *any* LUN allows you to reserve *all* luns. Thanks for taking the time to explain---I knew about this, but I thought it could (perhaps should) be disabled on the SAN. Anybody could already use reservation by transport ID if they had root access on the local machine, no? Paolo -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
