[dm-devel] multipath-tools libmultipath/configure.c libmu ...
Pasi Kärkkäinen
pasik at iki.fi
Fri Sep 19 08:52:05 UTC 2008
On Fri, Sep 19, 2008 at 03:27:10AM -0000, bmarzins at sourceware.org wrote:
> CVSROOT: /cvs/dm
> Module name: multipath-tools
> Branch: RHEL5_FC6
> Changes by: bmarzins at 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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