On Tuesday May 3, pml@xxxxxxxx wrote: > Hi Neil, > > I've gotten past the device being busy using the patch, and onto a new > error message and set of problems: > > root@localhost:~/dev/mdadm-2.0-devel-1# ./mdadm -E /dev/hdb > root@localhost:~/dev/mdadm-2.0-devel-1# ./mdadm -E /dev/hdc > root@localhost:~/dev/mdadm-2.0-devel-1# ./mdadm -E /dev/hdd > root@localhost:~/dev/mdadm-2.0-devel-1# ./mdadm -C -l 5 -n 3 -e 1 > /dev/md0 /dev/hdb /dev/hdc /dev/hdd > VERS = 9002 > mdadm: ADD_NEW_DISK for /dev/hdb failed: Invalid argument .... > > And the following in Dmesg: > md: hdb has invalid sb, not importing! > md: md_import_device returned -22 > Hey, I got that too! You must be running an -mm kernel (I cannot remember what kernel you said you were using). Look in include/linux/md_p.h near line 205. If it has __u32 chunksize; /* in 512byte sectors */ __u32 raid_disks; __u32 bitmap_offset; /* sectors after start of superblock that bitmap starts * NOTE: signed, so bitmap can be before superblock * only meaningful of feature_map[0] is set. */ __u8 pad1[128-96]; /* set to 0 when written */ then change the '96' to '100'. (It should have been changed when bitmap_offset was added). You will then need to mdadm some more. In super1.c near line 400, sb->ctime = __cpu_to_le64((unsigned long long)time(0)); sb->level = __cpu_to_le32(info->level); sb->layout = __cpu_to_le32(info->level); sb->size = __cpu_to_le64(info->size*2ULL); notice that 'layout' is being set to 'level'. This is wrong. That line should be sb->layout = __cpu_to_le32(info->layout); With these changes, I can create a 56 device raid6 array. (I only have 14 drives, but I partitioned each into 4 equal parts!). I'll try to do another mdadm-2 release in the next week. Thanks for testing this stuff... NeilBrown - 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
