I am currently trying to create a RAID-0 array using 5 SCSI drives with raidtools2 on Debian but it is failing. Any input would be appreciated. When I run 'mkraid /dev/md0', I get the following:
$ sudo mkraid /dev/md0 handling MD device /dev/md0 analyzing super-block disk 0: /dev/sdb1, 4190400kB, raid superblock at 4190336kB disk 1: /dev/sdc1, 4190400kB, raid superblock at 4190336kB disk 2: /dev/sdd1, 4190400kB, raid superblock at 4190336kB disk 3: /dev/sde1, 4180722kB, raid superblock at 4180608kB disk 4: /dev/sdf1, 4190400kB, raid superblock at 4190336kB /dev/md0: Invalid argument
Doing an strace of it gives the following reason for the Invalid argument:
open("/dev/md0", O_RDWR) = 4
ioctl(4, 0x800c0930, 0xeffff7d8) = -1 EINVAL (Invalid argument)
dup(2) = 5
nfssvc(0x5) = 2
fstat64(5, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 2), ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7001e000
_llseek(5, 0, 0xeffff4a0, SEEK_CUR) = -1 ESPIPE (Illegal seek)
write(5, "/dev/md0: Invalid argument\n", 27/dev/md0: Invalid argument
) = 27
Contents of my /etc/raidtab: raiddev /dev/md0 raid-level 0 nr-raid-disks 5 persistent-superblock 1 chunk-size 4 device /dev/sdb1 raid-disk 0 device /dev/sdc1 raid-disk 1 device /dev/sdd1 raid-disk 2 device /dev/sde1 raid-disk 3 device /dev/sdf1 raid-disk 4
Contents of /proc/mdstat: Personalities : [raid0] read_ahead not set unused devices: <none>
kernel messages after running mkraid: md: bind<sdb1,1> md: bind<sdc1,2> md: bind<sdd1,3> md: bind<sde1,4> md: bind<sdf1,5> md: sdf1's event counter: 00000000 md: sde1's event counter: 00000000 md: sdd1's event counter: 00000000 md: sdc1's event counter: 00000000 md: sdb1's event counter: 00000000 too small chunk_size: 4096 < 8192 md: md0 stopped. md: unbind<sdf1,4> md: export_rdev(sdf1) md: unbind<sde1,3> md: export_rdev(sde1) md: unbind<sdd1,2> md: export_rdev(sdd1) md: unbind<sdc1,1> md: export_rdev(sdc1) md: unbind<sdb1,0> md: export_rdev(sdb1)
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