Judging from your tar comment, you're expecting way more output than
this from dmraid -rD:
root@ubuntu:~# dmraid -rD
/dev/sdh: ddf1, ".ddf1_disks", GROUP, ok, 3906572288 sectors, data@ 0
/dev/sdg: ddf1, ".ddf1_disks", GROUP, ok, 3906572288 sectors, data@ 0
/dev/sdf: ddf1, ".ddf1_disks", GROUP, ok, 3906572288 sectors, data@ 0
/dev/sde: ddf1, ".ddf1_disks", GROUP, ok, 3906572288 sectors, data@ 0
/dev/sdd: ddf1, ".ddf1_disks", GROUP, ok, 3906572288 sectors, data@ 0
/dev/sdc: ddf1, ".ddf1_disks", GROUP, ok, 3906572288 sectors, data@ 0
/dev/sdb: sil, "sil_acagdccaeafe", stripe, ok, 117229312 sectors, data@ 0
/dev/sda: sil, "sil_acagdccaeafe", stripe, ok, 117229312 sectors, data@ 0
However, your guess is wrong. I bought this system only a couple of months ago,
and Maverick was the first and only OS to become alive on it.
The controller on which the SATAs are sitting
00:1f.2 SATA controller: Intel Corporation 82801JI (ICH10 Family) SATA AHCI
Controller (prog-if 01 [AHCI 1.0])
is incapable of doing RAID6.
In the BIOS the controller is in AHCI mode, and has, aside from some very
short-lived experimenting, always been in AHCI mode.
These drives were empty before, and have only been used as an mdadm RAID. I did
however recreate it a couple of times fiddling with various tweaks (mostly
stripsize & metadata versions) before settling on the current config.
But each time I never used the assume-clean option or such, allowing the mdadm
RAID6 to fully build before doing anything else with it.
Also, this particular problem didn't occur on Maverick, and simply
excluding ENV{ID_FS_TYPE}!="linux_raid*" in udev 'solves' it in Natty,
indicating that at least udev/kernel are aware that this is actually a
linux_raid instead of a FakeRAID one.
As a side note, I never heard of DDF1 before, and it was actually you
who told me it was a metadata format. So I never actually tweaked
neither mdadm nor dmraid as far as to specify an apparently deprecated
format.
** Attachment added: "dmraid -n /dev/sdc"
https://bugs.launchpad.net/ubuntu/+source/dmraid/+bug/742145/+attachment/1942995/+files/dmraid-n
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https://bugs.launchpad.net/bugs/742145
Title:
ddf1 format should be disabled in dmraid in favor of mdadm
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