It seems that online resizing of a multipath device is actually impossible: http://www.redhat.com/archives/dm-devel/2007-August/msg00205.html
This is my personal offline how-to: # Rescan devices (for all 4 paths) echo "1" > /sys/bus/scsi/drivers/sd/<h>\:<b>\:<t>\:<l>/block/device/rescan ... # Check /var/log/messages # Trespass LUN by Navisphere # Rescan devices (for all 4 paths) echo "1" > /sys/bus/scsi/drivers/sd/<h>\:<b>\:<t>\:<l>/block/device/rescan ... # Check /var/log/messages # Umount filesystem # Deactivate VG vgchange -an vg_LUN # Delete and recreate multipath device multipath -F multipath -v2 multipath -ll # Activate VG vgchange -ay vg_LUN # Remount filesystem # Extend PV pvresize /dev/mapper/<long-multipath-identifier> # Check VG vgdisplay -v vg_LUN # Extend LV lvextend -l +256 /dev/vg_LUN/lvol... # Extend FS ext2online /dev/vg_LUN/lvol... Alternatively, you can create an additional LUN and add it to the VG (online) If someone is able to find a better method, please post it! -- Domenico Viggiani > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Collins, > Kevin [Beeline] > Sent: Monday, July 21, 2008 6:31 PM > To: Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list > Subject: RE: [rhelv5-list] RE: multipathing in RHEL5 > > What about if the LUN is an LVM physical volume (PV) already? > Can you use pvresize? > > Thanks, > > Kevin > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Domenico Viggiani > Sent: Monday, July 21, 2008 1:28 AM > To: 'Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list' > Subject: [rhelv5-list] RE: multipathing in RHEL5 > > We are currently using native Red Hat multipath with an EMC > Clariion CX700 disk-array. No problem at all, you need only > to be well-disciplined and methodical with > creating/destroying LUNs. Only real BIG problem is that you > cannot resize a LUN online (unless you add PV to an existing > VG, using LVM). > > Bye > -- > Domenico Viggiani > > _______________________________________________ > rhelv5-list mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/rhelv5-list > > _______________________________________________ > rhelv5-list mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/rhelv5-list > _______________________________________________ rhelv5-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv5-list
