[TriLUG] RAID autodetect vs non-FS partition

[Charles Mangin]

hi all.

i've been using a RAID 5 system as storage on my Fedora box for a while now, via mdadm. having grown it a few times (replace each drive in turn, grow the partition, etc) i've been pretty happy with the result.

now, however, i'm wondering whether i need to rebuild it. all the individual partitions have always been set as "RAID autodetect" (0xFD in fdisk), which is now "deprecated". if i were building i new, it's recommended i use "non-FS" partitions (0xDA).

two questions, then:

1 - am i setting myself up for failure if i have to move the RAID to a new system or upgrade to a point where autodetect is no longer supported?
2 - is there a way to rebuild the raid in-place, by reformatting/repartitioning each drive as non-FS instead of autodetect, or is mixing the two in the same RAID a Bad Idea?




--charles.


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