On Tue, 10/07/2014 03:15 AM, NeilBrown <neilb@xxxxxxx> wrote: > On Tue, 7 Oct 2014 02:56:31 -0400 Errol Neal <eneal@xxxxxxxxxxxxxxxxx> wrote: > > > On Mon, 10/06/2014 09:06 AM, Errol Neal <eneal@xxxxxxxxxxxxxxxxx> wrote: > > > hi folks. is it possible to assemble an md device in read-only mode? > > > after an array has been assembled, I know I can mark it as readonly with --misc -o /dev/md0 for example, but only after its been assembled it seems.. > > > > > > > Hi again. No thoughts here? > > Not even 18 hours since you last asked - what do you thing this is? The > Internet :-) HAHA. I tend to feel ignored on large mailing lists lol. Need to see my therapist again ;) > > > I'm need to run a RAID1 device on two independent nodes (shared storage) and I'd like to assemble the device on the "slave" node in read-only mode to prevent any sync actions and etc. > > Did you try adding the "--readonly" option to your --assemble command? > (Always best to report everything you tried and how it failed - requires less > guess work). I did that previously and mdadm told me that "option --readonly not valid in assemble mode". E.g. "mdadm --assemble --scan --readonly". The readonly flag seems like it can only be used after a device has been assembled. So for example, after the device has been assembled, I can run mdadm --misc -o /dev/md0 but that is not always safe for my use case. > I hope you don't expect too much of a filesystem mounted from such an array > while the other node is writing to the array... > I don't. It will be read-only until the pacemaker RA promotes the slave. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
