Re: Setting up /boot when it is not a separate partition

On Thu, Aug 13, 2015 at 3:31 PM, Colin Walters <walters verbum org> wrote:
On Thu, Aug 13, 2015, at 05:16 AM, Fabian Deutsch wrote:
On Tue, Aug 11, 2015 at 11:03 PM, Colin Walters <walters verbum org> wrote:
On Wed, Aug 5, 2015, at 12:12 PM, Chris Murphy wrote:

I'm noticing the initramfs for Fedora Atomic installation is
nohostonly, so they are each ~41MB rather than the 18MB I see on
Fedora Server/Workstation. Is this intentional?

Currently yes - the initramfs is assembled server side.  That could change,
but it's not high priority for me right now at least.

Let me note that client side initramfs generation is needed to support
multipath devices reliably.

Why is that?  This is just config data, right?  That should be able to go on the kernel commandline.

No, it's not just config data.

Two cases:
1. Some hardware requires to set special directives in the
multipath.conf to setup their handlers correctly
2. To be able to boot from a multipath device reliably, the wwid must
be known up on device initialisation (happens in initramfs)

1. can not be fixed by kernel commandline arguments - alua is a case
where you need to modify the configuration file (See also [0] [1] [2])
2. can partially be addressed by kernel commandline arguments
(mpath.wwid=<wwid>) but they can be quite long, and sometimes you
might need to add more than one wwid.

- fabian


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