Re: multipath-tools libmultipath/configure.c libmu ...

[Benjamin Marzinski <bmarzins@redhat.com>]

On Tue, Sep 30, 2008 at 12:38:43PM +0300, Pasi Kärkkäinen wrote:
> On Tue, Sep 30, 2008 at 12:22:06PM +0300, Pasi Kärkkäinen wrote:
> > On Tue, Sep 23, 2008 at 01:05:04PM -0500, Benjamin Marzinski wrote:
> > > > 
> > > > Responding to my own mail, I did got the source with the patches from the
> > > > cvs.  But, the resizing does not work for with with mounted volumes.  There
> > > > are 4 paths for the volume, so there is no probably with it failing paths. 
> > > > I get "domap(0) failure for create/reload map" when I run multipath -v 3.
> > > > 
> > > > I can get dm to reconize the new size if the volume is umounted.  But, I
> > > > really would like it to work while it is mounted.
> > > > 
> > > 
> > > It should work for mounted volumes.  Did you try
> > > multipathd -k"resize map <mapname>"
> > > 
> > > Since this requires suspending without the no_flush option, I didn't
> > > want to have it happen on a normal reload, and since without the kernel
> > > fixes, this required removing and then readding paths, I did it through
> > > multipathd.
> > > 
> > > So just running multipath -v3 after a path resize won't work. In fact, I
> > > think it might leave the devices in the suspended state, since the
> > > resume fails.
> > > 
> > 
> > Hi!
> > 
> > I just tried this but I'm having problems getting it to work..
> > 
> > # multipathd -k"resize map mpath-resize-test"
> > fail
> > 
> > The underlying SCSI devices have been online resized already, and verified
> > from dmesg and from /proc/partitions to be bigger.
> > 
> > I'm running rhel5 kernel with scsi online resize patches (2.6.18-93.el5.bz444964.2)
> > and dm-multipath testing packages with support for online resizing
> > (device-mapper-multipath-0.4.7-19.el5.i386.rpm).
> > 
> > Any ideas? 
> > 
> 
> Actually I think the problem was that I had not yet reloaded multipathd
> configuration, so my underlying devices were still blacklisted according to
> multipathd -k"show devices".. but still I had the mpath-device up and
> running :) Oh well..
> 
> I ran "/etc/init.d/multipathd reload" and then:
> 
> # multipathd -k"resize map mpath-resize-test"
> ok
> 
> But "multipath -ll" still shows the mpath-resize-test device with the
> same/old size.. 
> 
> What to do/try next? 

Does

# blockdev --getsize <scsi_device>

show the new size, after you have increased the scsi device size?

Also, can you start up multipathd with the -v3 option, and copy any
messages that are printed out when you run 

# multipathd -k"resize map mpath-resize-test"

Thanks.

-Ben
> 
> -- Pasi
> 
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