nate wrote: > Simen Timian Thoresen wrote: > >> So - with the LV unmounted, I power my USB-device down, and then back up; > Hi Nate, > I believe your problem is you didn't deactivate the logical > volume, and export the volume group before disconnecting. Yes! Thank you - exporting and then importing again after replugging worked. I'll have to read up on what actually happens here .-) Still - say that the USB (or iSCSI) PV is not exported before being unplugged (cables tripped over, internet connection going down, etc) - how do I recover from an unplugged but not exported PV/VG? It seems that vg[im/ex]port only fiddle with the off-PV metadata. Is this correct? I think I'm looking for a force-import that allows me to bring a VG with associated LVs up provided that the PVs are present - affectively a 'assemble' ala mdadm. Thank you for pointing me in the right way ;-) -S > lvchange -a n <path to lvm> > vgexport -a (don't worry it will only export groups that are > ready to be exported) > > Now you can safely power the device down(provided the VG was > successfully exported, all logical volumes must be unmounted > and deactivated before it will succeed). > > when you power it back up run > > pvscan > vgimport -a > lvchange -a y <path to lvm> > > LVM is very useful for volumes that change device names, but you > must use it properly otherwise bad things will happen as you > saw. > > If you want to have USB mount automatically it may be better > to put a label on the file system, at least in Debian(don't > have a CentOS system with a USB disk handy here) the volume > is mounted as /media/<disk label> if there is a disk label. > You can use the e2label command to label the device. I'd > expect CentOS to likely behave similarly to debian in this > respect. > > nate > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Simen Thoresen, Dolphin ICS Systems Administration and Wulfkit Support