Increase Capacity of RAID Mirror

Ok - figured it out I think:

$ df -h
Filesystem Size Used Avail Use% Mo unted on
rootfs 145G 1.2G 137G 1% /
udev 10M 0 10M 0% /d ev
tmpfs 201M 1.1M 200M 1% /r un
/dev/disk/by-uuid/1ab372d1-cc9d-4ec3-b3b7-ca313e73f288 145G 1.2G 137G 1% /
tmpfs 5.0M 0 5.0M 0% /r un/lock
tmpfs 401M 0 401M 0% /r un/shm
tmpfs 1002M 0 1002M 0% /t mp
/dev/md0 294G 289G 4.6G 99% /m edia/f021ce24-80f1-4af3-8752-d2624a0dc73b
$ mp

$ cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb[0] sda[2]
312440000 blocks super 1.2 [2/2] [UU]

unused devices: <none>
$

Does this help?

Is this what you wanted?

$ blkid
-dash: 1: blkid: not found
$ fdisk -1
-dash: 2: fdisk: not found
$

Sorry - must have done something wrong - try this.

root@Server:~# blkid
/dev/md0: LABEL="PegServer" UUID="f021ce24-80f1-4af3-8752-d2624a0dc73b" TYPE="ext4"
/dev/sda: UUID="bd4374f8-6986-569d-ec97-cdc91c74ee12" UUID_SUB="3ebe8b58-a4a0-4b5e-da69-8eb2ba76b02e" LABEL="Server:Data" TYPE="linux_raid_member"
/dev/sdb: UUID="bd4374f8-6986-569d-ec97-cdc91c74ee12" UUID_SUB="124b9726-0efe-a052-23e7-d9baedb7cbd8" LABEL="Server:Data" TYPE="linux_raid_member"
/dev/sdc1: UUID="1ab372d1-cc9d-4ec3-b3b7-ca313e73f288" TYPE="ext4"
/dev/sdc5: UUID="3FE015CBD8E1E984" TYPE="ntfs"
root@Server:~# fdisk -l

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

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

Disk /dev/sdb: 500.1 GB, 500106780160 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976771055 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x3a4b3a4a

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

Disk /dev/sdc: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders, total 312581808 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000da91e

Device Boot Start End Blocks Id System
/dev/sdc1 * 2048 308387839 154192896 7 HPFS/NTFS/exFAT
/dev/sdc2 308389886 312580095 2095105 5 Extended
/dev/sdc5 308389888 312580095 2095104 7 HPFS/NTFS/exFAT

Disk /dev/md0: 319.9 GB, 319938560000 bytes
2 heads, 4 sectors/track, 78110000 cylinders, total 624880000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

Disk /dev/md0 doesn't contain a valid partition table
root@Server:~#

Do I stop the ssh service? I'll need that running won't I?

ran the umount command & now the file system for md0 says n/a for capacity, available & used.
Tried the resize button but again nothing happened.

ran mount -a and its back to where it was - no change in size

root@Server:~# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sun Jan 18 16:04:16 2015
Raid Level : raid1
Array Size : 312440000 (297.97 GiB 319.94 GB)
Used Dev Size : 312440000 (297.97 GiB 319.94 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent

Update Time : Mon Oct 12 21:46:59 2015
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

Name : Server:Data (local to host Server)
UUID : bd4374f8:6986569d:ec97cdc9:1c74ee12
Events : 5902

Number Major Minor RaidDevice State
0 8 16 0 active sync /dev/sdb
2 8 0 1 active sync /dev/sda
root@Server:~#

I think we have success - its resyncing & the file capacity is increasing
Thank you VERY much for your help.