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We have a Sun X4270 with 16 disks. I am having an odd problem where raid devices are not being ignored by LVM and raid devices are geting hosed after reboots.
This system is running kernel 2.6.18-126.96.36.199.2.el5. (64-bit)
/dev/sda is the system disk and is cold-mirrored to /dev/sdf. The remaining devices are being used to create a 14-device raid5 device - /dev/md0.
Each of the disks to be used in the raid device are partitioned as so:
Disk /dev/sdb: 36472 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
Device Boot Start End #cyls #blocks Id System
/dev/sdb1 0+ 36471 36472- 292961308+ fd Linux raid autodetect
/dev/sdb2 0 - 0 0 0 Empty
/dev/sdb3 0 - 0 0 0 Empty
/dev/sdb4 0 - 0 0 0 Empty
The problem is that you're using partition ID fd for your RAID partitions and you're loading device mapper at boot. Device mapper and md volumes are two very different things.
Seeing partitions with ID fd, device mapper will look for LVM metadata on your volumes. Of course, you're not actually using device mapper/LVM, so this cannot possibly work. Unfortunately, it seems device mapper finds something that resembles LVM metadata and tries to set up LVM volumes accordingly.
Possible solutions: Don't use partition ID fd and/or don't load the device mapper kernel modules at boot (or at all).