[dm-devel] Status of resizing/growing dm-multipath devices on the fly

[Pasi Kärkkäinen]

On Wed, Aug 06, 2008 at 02:46:57PM -0700, Sharif Nassar wrote:
> On Wed, 6 Aug 2008, Pasi Kärkkäinen wrote:
> 
> >Hello!
> >
> >Is it possible to resize (grow) dm-multipath devices on the fly nowadays? 
> >
> >I googled and found some discussions about the subject, but the conclusion
> >seemed to be it's not possible.. that was a while ago, so I was wondering 
> >if
> >this has been fixed/implemented.. 
> >
> >Using LVM and adding another new LUN/PV is not an option always.. it's a 
> >lot
> >easier to manage the whole thing if it's possible to resize/grow existing
> >LUNs on the fly.
> 
> 
> Sure it is, but it's not pretty.  Don't believe the naysayers.
> We seem to have a working method for resizing multipath luns from our 
> NetApp filers.  It works on CentOS 4 & 5, for us, and our NetApps.
> (2 HBA, times 2 paths on each makes for four SCSI LUN to resize)
> 
> The poorly formatted, unpolished, YMMV, no warranty recipe is:
> 

Thanks a lot! 

Better to have a workaround than nothing :) 

-- Pasi