Hello All,

I have two existing RAID0 file systems (/dev/md0 and /dev/md1). One is already in use (/dev/md0). I would like to mirror /dev/md0 to /dev/md1. They are identical. Please see below:

# cat /proc/mdstat
Personalities : [raid0]
md1 : active raid0 sdf1[0] sdi1[3] sdh1[2] sdg1[1]
1953535744 blocks 4k chunks

md0 : active raid0 sdb1[0] sde1[3] sdd1[2] sdc1[1]
1953535744 blocks 4k chunks

# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_amd1-lv_root
457G 4.4G 448G 1% /
tmpfs 502M 88K 502M 1% /dev/shm
/dev/sda1 194M 55M 130M 30% /boot
/dev/md0 1.8T 440G 1.3T 26% /share/raid0-0
/dev/md1 1.8T 196M 1.7T 1% /share/raid0-1

]# fdisk -l

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x9e5b8f3b

Device Boot Start End Blocks Id System
/dev/sda1 * 1 26 204800 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 26 60801 488179201 8e Linux LVM

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0004000f

Device Boot Start End Blocks Id System
/dev/sdb1 1 60801 488384001 fd Linux raid autodetect

Disk /dev/sdc: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x2800dc82

Device Boot Start End Blocks Id System
/dev/sdc1 1 60801 488384001 fd Linux raid autodetect

Disk /dev/sdd: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x051ade4e

Device Boot Start End Blocks Id System
/dev/sdd1 1 60801 488384001 fd Linux raid autodetect

Disk /dev/sde: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0003229b

Device Boot Start End Blocks Id System
/dev/sde1 1 60801 488384001 fd Linux raid autodetect

Disk /dev/sdf: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00002a0e

Device Boot Start End Blocks Id System
/dev/sdf1 1 60801 488384001 fd Linux raid autodetect

Disk /dev/sdg: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000658dc

Device Boot Start End Blocks Id System
/dev/sdg1 1 60801 488384001 fd Linux raid autodetect

Disk /dev/sdh: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000bd71b

Device Boot Start End Blocks Id System
/dev/sdh1 1 60801 488384001 fd Linux raid autodetect

Disk /dev/sdi: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00034977

Device Boot Start End Blocks Id System
/dev/sdi1 1 60801 488384001 fd Linux raid autodetect

Disk /dev/dm-0: 497.8 GB, 497779998720 bytes
255 heads, 63 sectors/track, 60518 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000

Disk /dev/dm-0 doesn't contain a valid partition table

Disk /dev/dm-1: 2113 MB, 2113929216 bytes
255 heads, 63 sectors/track, 257 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000

Disk /dev/dm-1 doesn't contain a valid partition table

Disk /dev/md0: 2000.4 GB, 2000420601856 bytes
2 heads, 4 sectors/track, 488383936 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0x00000000

Disk /dev/md0 doesn't contain a valid partition table

Disk /dev/md1: 2000.4 GB, 2000420601856 bytes
2 heads, 4 sectors/track, 488383936 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0x00000000

Disk /dev/md1 doesn't contain a valid partition table

Please advise,

xnightcrawl