The Disk Data Format (DDF) trial use draft spec has now been published by SNIA. This is the common on-disk metadata format that RAID vendors have been driving towards, which should allow one to move disks from one vendor's RAID controller to another vendor's RAID controller without the backup-rebuild-restore that's currently needed.
http://www.snia.org/tech_activities/ddftwg
Thanks for posting this.
I haven't even read past "locality" section to find brokenness. DDF RAID groups (a.k.a. each RAID array) must store information about other RAID groups "on the controller." There is also apparently per-controller state information one must care about. While I understand why they would want this, this also means the format is quite a bit less flexible than md, and in some respects, more difficult to work with.
/me continues reading...
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