On Thu, Jul 24, 2008 at 04:03:28PM +0200, Domenico Viggiani wrote: > I follow dm-devel mailing list and it seems that there was no improvements. > Sincerely, I think that online resizing is crucial for enterprise storage > systems. >
It seems there actually IS a way to resize multipath devices on the fly: https://www.redhat.com/archives/dm-devel/2008-August/msg00033.html Better than nothing.. And there seems to be efforts to getting this fixed: https://www.redhat.com/archives/dm-devel/2008-August/msg00032.html http://thread.gmane.org/gmane.linux.scsi/41623 -- Pasi > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of Pasi Kärkkäinen > > Sent: Thursday, July 24, 2008 2:17 PM > > To: Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list > > Subject: Re: [rhelv5-list] RE: multipathing in RHEL5 > > > > On Mon, Jul 21, 2008 at 06:46:47PM +0200, Domenico Viggiani wrote: > > > It seems that online resizing of a multipath device is > > actually impossible: > > > http://www.redhat.com/archives/dm-devel/2007-August/msg00205.html > > > > > > > Hmm.. is this still the case nowadays? :( > > > > Anyone working on getting this fixed? > > > > -- Pasi > > > > > 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
