![]() Ensuring the health of RAID arrays and RAID controllers is critical to protected against sudden downtime and/or data loss. recovery = 4.3% (21448384/487853760) finish=114. RAID Controller Monitoring With Nagios RAID (Redundant Array of Inexpensive Disks) is a method for protecting against data loss on hard drvies. The /proc/mdstat file currently contains the following: This is an automatically generated mail message from mdadmĪ DegradedArray event had been detected on md device /dev/md1. ![]() Now in case there is something wrong with your RAID setup you will receive an email alert similar to this one: From: mdadm monitoring Again, zombie processes have a state flag of Z, and you’ll usually also see defunct. We can list these by using the ps command and piping it into egrep. Then save the file and restart mdadm by executing the command: /etc/init.d/mdadm restart The top command is a convenient way to see if you have any zombies. To set this up, simply edit /etc/nf ( or /etc/mdadm/nf if it is Debian) file and add the following line: MAILADDR replacing with your email address. At Fraction Servers we do not monitor customers RAID arrays and recommend any customer using software RAID setups monitoring of their RAD arrays. It is very simple and very useful at the same time to setup email alerts, so if there is something wrong with RAID setup, you will receive an email. Setting up Email Alerts for RAID Monitoring If you need more details about the specific RAID device, just run the following command, replacing /dev/md126 with the name of the device, you wanted to check: ~]# mdadm -detail /dev/md126Īrray Size : 975872 (953.00 MiB 999.29 MB) To check the health status of your RAID array, you can simply run the following command: ~]# cat /proc/mdstat back to normal status, and the rebuild process begins automatically. Stellar Data Recovery Technician is a multi-utility software that helps you to recover the entire RAID server data from degraded RAID 0, RAID 5 and RAID 6 arrays. Note: If you are using Debian operating system the nf file will be located at: /etc/mdadm/nf Use the program to create RAID arrays, and then manage and monitor the RAID arrays. Checking RAID configuration and statusĪll essential information about RAID devices are stored in ‘/etc/nf’ file, which looks similar to the following: ~]# cat /etc/nfĪRRAY /dev/md/boot level=raid1 num-devices=2 UUID=f8ce33fe:afd0b1b5:7aedbcf9:13e967d3ĪRRAY /dev/md/root level=raid1 num-devices=2 UUID=a7866d4d:ec7a94a9:dc0e1c5a:76848e6bĪRRAY /dev/md/swap level=raid1 num-devices=2 UUID=faca3cc3:7da4398b:5b42d265:3d14b0e2 The levels of RAID are explained in detail here: However the most popular ones for redundancy are RAID1 (Mirroring) and RAID 10 (Striping and Mirroring). ![]() Linux Supports the following software RAID levels: RAID 0 (No Redundancy), RAID 1, RAID 4, RAID 5, RAID 6, RAID 10. Most RAID levels will allow some degree of drive failure, which is useful to protect important data. ![]() With Linux, it is possible to use RAID without a need to have a hardware RAID controller, with both software and hardware RAID supported. It basically is a virtual device created from physical drives or partitions. RAID is an acronym of ‘Redundant Array of Independent Disks’. ![]()
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