![]() If you want to access all the latest and upcoming features such as fully named RAID arrays so you no longer have to memorize which partition goes where, you'll want to make sure to use persistent metadata in the version 1.0 or higher format, as there is no way (currently or planned) to convert an array to a different metadata version. This is an 'everything else' mode that supports operations on active arrays, operations on component devices such as erasing old superblocks, and information gathering operations.īelow we'll see how to create arrays of various types the basic approach is: This is for doing things to specific components of an array such as adding new spares and removing Currently supported growth options including changing the active size of component devices in RAID level 1/4/5/6 and changing the number of active devices in RAID1. Grow, shrink or otherwise reshape an array in some way. Used together with a complete understanding of what you are doing. Because of this, the Build mode should only be It also cannot perform anyĬhecks that appropriate devices have been requested. For these sorts of arrays, mdadm cannotĭifferentiate between initial creation and subsequent assembly of an array. Typically you do this after rebooting too.īuild an array that doesn't have per-device superblocks. Spare, or failed drives, so there is nothing to monitor. This is only meaningful for raid1, 4, 5,Ħ, 10 or multipath arrays as only these have interesting state. Monitor one or more md devices and act on any state changes. Request, fiddle superblock information so as to assemble a faulty array. mdadm checks that the components do form a bona fide array, and can, on Normal operation just uses the 'Create', 'Assemble' and 'Monitor' commands - the rest come in handy when you're messing with your array typically fixing it or changing it.Ĭreate a new array with per-device superblocks (normal creation).Īssemble the parts of a previously created array into an active array. Mdadm is well documented in its manpage - well worth a read. As a linux-specific program there is none of this autoconf stuff - just follow the instructions as per the INSTALL file.Īlternatively just use the normal distribution method for obtaining the package: In the absence of any other preferences, do that in the /usr/local/src directory. You can retrieve the most recent version of mdadm with Mdadm is now the standard RAID management tool and should be found in any modern distribution. Which are discussed in Partition Types Downloading and installing mdadm - the RAID management tool Should I use entire device or a partition?.Preparing and partitioning your disk devicesĪrrays can be built on top of entire disks or on partitions. See the /proc/mdstat page for more details. It should tell you that you have the right RAID personality (eg. If you're sure your kernel has RAID support you may need to run run modprobe raid to load raid support into your kernel. Have that file, maybe your kernel does not have RAID support. If your system has RAID support, you should have a file called The first two items are included as standard in most GNU/Linux distributions ![]() ![]() ![]() Patience, Pizza, and your favorite caffeinated beverage.Although most of this should work fine with later 3.x kernels, too. A kernel with the appropriate md support either as modules or built-in.This is what you need for any of the RAID levels: 1.6 Saving your RAID configuration (2011).1.3 Downloading and installing mdadm - the RAID management tool.1.2 Preparing and partitioning your disk devices.
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