> 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.
Just a +1 that we'd love this ability. Not having to keep an initramfs
and kernel in sync would be a nice reduction in complexity in places
where we know exactly how we're going to boot and don't need dracut's
cornucopia of options.
Thanks,
--
Patrick Hahn
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