Root Drive Mirroring and LVM.

Atro Tossavainen atossava at
Tue Jan 27 19:01:17 EST 2004

Sorry about the crossposting.

I wrote on the Yellow Dog Linux list when somebody asked about software
RAID on YDL about my experiences with it:

>> The one really big gotcha is that the Macintosh partitioning scheme
>> can't tell the Linux kernel that certain partitions are to be
>> considered "Linux RAID autodetect" (as in x86 using the DOS partition
>> table type 0xfd). This means that you can't boot a Mac Linux system
>> directly from RAID because the kernel won't be able to autostart the
>> RAID devices. You have to work around this by creating an initial RAM
>> disk that uses the raidstart command to start your metadevices, then
>> swaps the initrd out of the way and proceeds to start the real system.

to which Tim Seufert replied on the same list:

> Hmmm.  That would seem to be a lack in the Linux RAID code, since the
> Macintosh partition table has a vastly more flexible partition type
> field than DOS: instead of a single byte it's a string.  It would mean
> breaking from the convention of using the "Apple_SVR2_UNIX" type for
> Linux partitions, but that really is just a convention as far as I know.

Perhaps the PPC Linux developers and the Linux RAID developers should
get together on this and make some decisions so as to make it happen.

Atro Tossavainen (Mr.)               / The Institute of Biotechnology at
Systems Analyst, Techno-Amish &     / the University of Helsinki, Finland,
+358-9-19158939  UNIX Dinosaur     / employs me, but my opinions are my own.
< URL : http : / / www . helsinki . fi / %7E atossava / > NO FILE ATTACHMENTS

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