On 05/28/2014 06:46 PM, Alex Elsayed wrote:
mark.doffman@xxxxxxxxxxxxxxx wrote:
From: Mark Doffman <mark.doffman@xxxxxxxxxxxxxxx>
Hi All,
The following is a third version of a patch series that adds the ability
to use a ceph distributed file system as the root device.
<snip>
Would you mind expanding on why you want to do this in the kernel, instead
of using an initramfs? For example, dracut supports the following syntax,
and sets it up using the same tools as mounting NFS in a running system
rather than the kernel's nfsroot support:
root=nfs:[<server-ip>:]<root-dir>[:<nfs-options>]
root=nfs4:[<server-ip>:]<root-dir>[:<nfs-options>]
root={dhcp|dhcp6}
root=dhcp alone directs initrd to look at the DHCP root-path where NFS
options can be specified.
It also supports CIFS, as a further illustration:
root=cifs://[<username>[:<password>]@]<server-ip>:<root-dir>
Extending this to Ceph seems much simpler than implementing such a thing in
the kernel, especially given dracut's modular nature, and it's easy enough
to compile an initramfs into the kernel.
An initramfs, and dracut, has been mentioned before as a possible
solution. The reason I would prefer this in the kernel is simplicity.
NFS root is in the kernel and we regularly use it without an initramfs.
However simple dracut is still a more complex procedure, for something
that is very easy to do in the kernel.
Using a root device also has the advantage that it might produce smaller
images for memory constrained devices.
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