Proposal for a new disk configuration utility

[Sam Vilain]

> For those of you who are already using LVM/RAID: Please check,
> whether the format described below allows for configuring your exact
> setup using FAI - thanks!

Looks like it supports everything the old one supported, except:

 1. RAID - name metadevices and support nesting

    Previously you could set up a raid 10 device with just RAID 0 + 1
    modules.  Just define your raid 0's, then use those metadevices as
    components of a raid 1.  Would that be possible?

    Also you used to be able to specify which metadevice each one is.
    Normally you only care for consistency.  These problems are
    perhaps peripherally related.

 2. Support optional specification of a PV to put a volume on.

    The script I wrote allowed you to do this.  For instance you might
    use one bug VG for flexibility, but specify that certain
    partitions end up on one physical volume seperate.  For example
    database journal volumes are often moved onto seperate disksets
    for busy OLTP servers.  However, you don't want to set up seperate
    VGs for them because then you can't move LVs between them.

Otherwise, I like the fact you're using EBNF to specify, makes
implementing it look more tempting :).

Actually reading the EBNF I think you've got the latter concern
covered; is that what is intended with this rule?

  type ::= primary
           /* for physical disks only */
           | logical
           /* for physical disks only */
           | raid[015]
           /* raid level */
           | [^/[:space:]]+:[^/[:space:]]+
           /* lvm logical volume: pv name and lv name*/

Sam.