How do I check LSI MegaRAID controller and raid array status on a  linux server Use the LSI MegaRAID megarc command line cli tool Download the megarc tool Download the megarc.bin utility which can be downloaded from LSI website at http://www.lsi.com/downloads/Public/MegaRAID Common [continue...]

Scenario / Question: How do I monitor linux software raid array status on a remote linux server Solution / Answer: Use the check_raid plugin and NRPE Download check_raid Plugin on Remote Host Server Downlaod check_lsi_megaraid plugin to /usr/local/nagios/libexec/ from [continue...]

Scenario / Question: A drive has failed in my raid 1 configuration, and I need to replace it with a new drive. Solution / Answer: Use mdadm to fail the drives partition(s) and remove it from the RAID array. Physically add the new drive to the system and remove the old drive. Create the same [continue...]

Scenario / Question: How do I extend my LVM to include another RAID Array partition Solution / Answer: Create a new Physical Volume Extend the Volume Group Extend the Logical Volume Resize the File System to the new size Display the current Physical Volumes: # pvdisplay --- Physical volume --- [continue...]

Scenario / Question: How do I add a hot spare to my existing RAID Arrays and also have it shared among the RAID Arrays Solution / Answer: Use mdadm to hot add the new drive partition to the RAID Array Configure mdadm.conf to include “spare-group” setting Configure mdadm to run in [continue...]

Scenario / Question: Setup a RAID 1 Array in an existing system using two new hard drives. Solution / Answer: Check the Partition Table on the new drives and create a RAID partition. Create a new RAID 1 Array using the newly created partitions Create mdadm.conf configuration file for the RAID [continue...]

Scenario / Question: First drive /dev/sda or /dev/hda failed in a RAID 1 configuration and now system will not boot. System booting but only getting a prompt that shows grub and a flashing cursor. Prevent system from crashing on reboot if first drive in RAID Array fails. Solution / Answer: Use [continue...]