Re: [Drbd-dev] Re: [john.cagle@hp.com: FW: device number request for drbd]

[Philipp Reisner <philipp.reisner@linbit.com>]

Am Mittwoch, 28. Juli 2004 17:33 schrieb Lars Marowsky-Bree:
> On 2004-07-28T16:55:18,
>
>    Philipp Reisner <philipp.reisner@linbit.com> said:
> > Yes I want to do this. Rolling upgrades are possible.
> > I do not think that anybody actually cares about the major number
> > or the name of the device node.
>
> Thanks for the 0.6 -> 0.7 upgrade path.
>
> > DRBD upgrade instructions from 0.7.0 to 0.7.1
> >
> > With drbd-0.7.1 we have our own major number, and our own device
> > files. (=No longer misuse /dev/nbX)
> >
> > * Start on the node, on which all devices are secondary.
> > * /etc/init.d/drbd stop
> > * Install drbd-0.7.1
> > * Run these commands as root:
> >
> > sed -e "s/\/dev\/nb/\/dev\/drbd/" < /etc/drbd.conf > /etc/drbd.conf_new
> > mv /etc/drbd.conf /etc/drbd.conf_old ; mv /etc/drbd.conf_new
> > /etc/drbd.conf sed -e "s/\/dev\/nb/\/dev\/drbd/" < /etc/fstab >
> > /etc/fstab_new
> > mv /etc/fstab /etc/fstab_old ; mv /etc/fstab_new /etc/fstab
> > for ((i=0;i<16;i++)); do mknod /dev/drbd$i b 147 $i; done
> >
> > * /etc/init.d/drbd start
> > * migrate all services to the just upgraded node and
> >   upgrade the other node.
>
> You need to manually fix the application configuration files up, custom
> scripts etc - for example, you forgot heartbeat's haresources, and if
> someone is running raw device access to drbd w/ a database...
>
> This is _not_ a change we can push out. The major number _might_ be
> changed, but the device path absolutely has to stay stable.

Maybe 
for ((i=0;i<16;i++)); do mknod /dev/nb$i b 147 $i; done

Currently you can not use NBD on a system on which DRBD is active.
So creating the /dev/nbX with DRBD's major number in SuSE's upgrade
path does not make anyhing worse...

But it preserves the "application configuration files & custom scripts"
compatibility...

PS: Thx for pointing out that heartbeat's haresources file is missing
    from the upgrade 

-Philipp