Creating RAID 6 in Linux

Goal: 4x RAID 6 arrays
Each array will consist of 10 disks + 2 spares.

For the first array:

Use fdisk to partition the HDs
Active: /dev/sd[b-k]
Spare: /dev/sd[l-m]

Examine the disks
mdadm -E /dev/sd[b-k]1

Create RAID 6 array
mdadm --create /dev/md0 --level=6 --raid-devices=10 /dev/sd[b-k]1

Create 2 spare disks
mdadm --add /dev/md0 /dev/sdl1 /dev/sdm1

Sanity check
cat /proc/mdstat
mdadm -E /dev/sd[b-m]1
mdadm --detail /dev/md0

Do the same for the remaining 3 arrays. Remember to save the mdadm config by

mdadm --detail --scan --verbose >> /etc/mdadm.conf

LVM

vgcreate vg1 /dev/md0 /dev/md1 /dev/md2

lvcreate -l 100%FREE -n lv1 vg1

mkfs.xfs /dev/vg1/lv1

mount -t xfs /dev/vg1/lv1 /mnt/test


In case of one array fails.

lvremove /dev/vg1/lv1

vgreduce vg1 --removemissing

#Remove the offending array, e.g /dev/md0
mdadm --stop /dev/md0
mdadm --zero-superblock /dev/sd[b-m]1

#Recreate the RAID array.

#Then add to vg1
vgextend vg1 /dev/md0

#Recreate the volume group and mount.
-------------------
References

http://www.tecmint.com/create-raid-6-in-linux/

http://www.thegeekstuff.com/2010/08/how-to-create-lvm/

https://www.centos.org/docs/5/html/Cluster_Logical_Volume_Manager/VG_admin.html

http://ubuntuforums.org/showthread.php?t=884556

Accessing ILOM on Sunfire X4540

Connect to the ILOM via serial port.

1. Open up a terminal via the port number (e.g. COM3). The correct serial port can be viewed under My Computer > Device Manager > Ports

Login to the web GUI via NET MGT
http://docs.oracle.com/cd/E24707_01/html/E24528/z40019501400145.html#scrolltoc

1. Connect an ethernet cable to NET MGT.
2. Set your internet settings on host to use the ILOM's IP address, netmask, and gateway.