[CentOS-devel] drbd83 update + no kmod update = broken server

Fri Sep 11 15:29:44 UTC 2009
Alan Bartlett <ajb at elrepo.org>

On 11/09/2009, Akemi Yagi <amyagi at gmail.com> wrote:
> On Fri, Sep 11, 2009 at 4:46 AM, Johnny Hughes <johnny at centos.org> wrote:
>  > Also, there is NO conflict or problem having both modules installed.
>  True (as I mentioned in my earlier post). But see below...
>  > Also, ALSO :D, I published an article on how to upgrade DRBD here:
>  >
>  > http://centosnow.blogspot.com/2009/08/drbd-packages-in-centos-4-and-centos-5.html
>  This is a must-read.  You should advertise it in more places. :-D
>  > So, I do not agree that kmod needs to obsolete the older one.  I think
>  > that having the older kmod there in case you need to boot into the older
>  > kernel is not bad.
>  That is the statement I have difficulty understanding. :)  In case you
>  need to boot into the older kernel ... the drbd module from -83 should
>  be there as a symlink.  Or, if you mean boot into the older kernel to
>  get drbd.ko *82*, then you would have to reinstall drbd82.
>  In other words, if drbd83 obsoletes drbd82, there is no merit for
>  still having drbd.ko (82) around because drbd82 gets removed upon the
>  82 -> 83 upgrade. If someone needs to go back to the 82, he needs to
>  manually install drbd82 anyway. (hope I'm making sense here)  :-)
>  One (minor) drawback of keeping both kmods is that each time
>  /sbin/meak-module is run, it has to do extra work going through all
>  installed kernels, once for kmod-drbd82 and another time for
>  kmod-drbd83.
>  Akemi
>  - now completely hiding under a huge rock

A question in two parts -- for Akemi to consider:

Are the kmod-drbd* packages kABI tracking? Or are they kernel version dependant?