If you remove the '-Werror' it'll compile and work, but you still can't convert a raid 0 to a raid 5. You're raid level understanding is off as well, raid 5 is a parity block rotating around all drives, you were thinking of raid 4 which has a single parity disk. Migrating raid 0 to raid 4 (and vice versa) should be possible technically, but I don't think it's implemented anywhere You should be able to have more than 4 active drives though. I am at this moment building an array with 6 components, I'm running a few with more than that, and these are by no means the largest arrays that people are running - just examples of it working. -Mike Martin Ritchie wrote: > Sorry if these are total newbie questions. > > Why can't I have more than 4 active drives in my md RAID? > > Why can't I easily migrate a RAID 0 to RAID 5. As I see it RAID 0 is > just RAID 5 with a failed parity check drive? > > Perhaps this is a limitation of the old v1.11 that FC4 updates to. > > I tried to compile 2.3 but I get this error: > > $make > gcc -Wall -Werror -Wstrict-prototypes -DCONFFILE=\"/etc/mdadm.conf\" - > ggdb -DSendmail=\""/usr/sbin/sendmail -t"\" -c -o super0.o super0.c > In file included from super0.c:31: > /usr/include/asm/byteorder.h:6:2: error: #warning using private kernel > header; include <endian.h> instead! > make: *** [super0.o] Error 1 > > I'm not too familiar with compiling this sort of thing. (I usually live > further away from the hardware and endian issues). I'm guessing there > is some sort of option i have to specify to say that this should use > the private kernel headers. Including endian.h instead didn't help: > > $make > gcc -Wall -Werror -Wstrict-prototypes -DCONFFILE=\"/etc/mdadm.conf\" - > ggdb -DSendmail=\""/usr/sbin/sendmail -t"\" -c -o super0.o super0.c > cc1: warnings being treated as errors > super0.c: In function ‘add_internal_bitmap0’: > super0.c:737: warning: implicit declaration of function ‘__cpu_to_le32’ > super0.c:742: warning: implicit declaration of function ‘__cpu_to_le64’ > make: *** [super0.o] Error 1 > > Oh just because I know it is going to be an issue I'm building on a > Athlon 64... my first 64bit linux box so I'm sure there are going to be > gotchas that I've not thought about. > > Is there somewhere I over looked for finding this information. > > TIA - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
