>>> On 12/20/2016 at 07:59 AM, Benjamin Block <[email protected]> 
>>> wrote: 
> But isn't that all handled automatically by grub2-install? It rebuilds
> the stage1-initramfs and also executes zipl AFAIK, and you don't have to
> care about the "bloody" details, like which initrd to copy and what
> zipl-config to use.

Yes, but grub2-install chews up a bunch more CPU and I/O.

> Anyway I just wanted to share some awareness, because I "bricked"
> already one (development) VM because I tried exactly this - extending
> btrfs with a second DASD - and forgot to rebuild the stage1 zipl and
> initramfs.

Passing "rd.dasd=" on the IPL command gets you past that so you can fix it.


Mark Post

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