15
1 8 48 1 active sync /dev/sdd
2 8 64 2 active sync /dev/sde
# Use four drives to create a RAID 10 array in container /dev/md0.
[root@localhost ~]# mdadm -C /dev/md0 /dev/sdc /dev/sdd /dev/sde /dev/sdf -n 4 -e imsm
mdadm: /dev/sdc appears to contain an ext2fs file system
size=976762584K mtime=Wed Dec 31 19:00:00 1969
mdadm: /dev/sdd appears to contain an ext2fs file system
size=976762584K mtime=Wed Dec 31 19:00:00 1969
mdadm: /dev/sdf appears to contain an ext2fs file system
size=3750738264K mtime=Wed Dec 31 19:00:00 1969
Continue creating array? y
mdadm: container /dev/md0 prepared.
[root@localhost ~]# mdadm -C /dev/md/R1 /dev/md0 -n 4 -l 10
mdadm: array /dev/md/R1 started.
[root@localhost ~]# cat /proc/mdstat
Personalities : [raid0] [raid6] [raid5] [raid4] [raid10]
md125 : active raid10 sde[3] sdd[2] sdf[1] sdc[0]
937691136 blocks super external:/md0/0 128K chunks 2 near-copies [4/4] [UUUU]
[>....................] resync = 0.1% (1635136/937691136) finish=76.3min
speed=204392K/sec
md0 : inactive sdf[3](S) sde[2](S) sdd[1](S) sdc[0](S)
4420 blocks super external:imsm
md126 : active raid0 sda[1] sdb[0]
890817536 blocks super external:/md127/0 128k chunks
md127 : inactive sdb[1](S) sda[0](S)
10402 blocks super external:imsm
unused devices: <none>
[root@localhost ~]# mdadm -D /dev/md125
/dev/md125:
Container : /dev/md0, member 0
Raid Level : raid10
Array Size : 937691136 (894.25 GiB 960.20 GB)
Used Dev Size : 468845568 (447.13 GiB 480.10 GB)
Raid Devices : 4
Total Devices : 4
State : clean, resyncing
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : near=2
Chunk Size : 128K
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