MDADM 4.2 Released For Managing Linux Software RAID

Written by Michael Larabel in Linux Storage on 3 January 2022 at 03:44 AM EST. 26 Comments
The mdadm utility for managing Linux software RAID arrays is out with a new release -- its first in more than three years.

MDADM 4.1 was released long before the pandemic even got started... All the way back in October 2018. As such with MDADM 4.2 now available, it's a rather big update. Meta's Jes Sorensen released MDADM 4.2 just before the new year. Jes summed up v4.2 as, "The release includes more than two years of development and bugfixes, so it is difficult to remember everything. Highlights include enhancements and bug fixes including for IMSM RAID, Partial Parity Log, clustered RAID support, improved testing, and gcc-9 support."

The updated compiler support is long overdue, there is lot of work on clustered RAID handling, there is now support for displaying sizes in Tebibytes, udev support for starting the mdadm-grow-continue service, NVMe multi-path support, and an assortment of other code cleaning and fixes.

mdadm is used for managing Linux software MD RAID arrays.

Downloads and more details on MDADM 4.2 over on
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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

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