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Re: [dm-devel] multipath-tools libmultipath/configure.c libmu ...



On Fri, Sep 19, 2008 at 03:27:10AM -0000, bmarzins sourceware org wrote:
> CVSROOT:	/cvs/dm
> Module name:	multipath-tools
> Branch: 	RHEL5_FC6
> Changes by:	bmarzins sourceware org	2008-09-19 03:27:08
> 
> Modified files:
> 	libmultipath   : configure.c configure.h devmapper.c devmapper.h 
> 	multipathd     : cli.c cli.h cli_handlers.c cli_handlers.h 
> 	                 main.c main.h 
> 
> Log message:
> 	Fix for bz #455692. There is now a command for multipathd, 'resize map'. This
> 	does online grows or shrinks for your multipath device. It has some warts.
> 	
> 	1. It needs to remove and re-add every path in the device. This can cause two
> 	annoyances. First, if you only have one valid path, you go into an all paths
> 	down scenario. However, you will immediately re-add the path, so it won't
> 	trigger problem #2. Second, if the path is inaccessable, you may not be able to
> 	re-add it.
> 	
> 	2. You can't disable flushing on suspend for a device-mapper device, when you
> 	want to change size. This means that if all your paths are down, you will fail
> 	the queued IOs when you suspend. This is a problem with the device-mapper kernel
> 	code, and there's no real way to avoid it, except by fixing it in the kernel.
> 	
> 	This commit also has some minor fixups for 238421, and adds the ability to
> 	disable and restore queueing on all multipath devices through multipathd
> 

Nice!!

So now we have SCSI disk online resizing, and dm-multipath online resizing. Excellent. 

I assume both of these will be in RHEL 5.3? 

-- Pasi


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