RAID 5/6 Changes Coming For Linux Software RAID (MD)
Written by Michael Larabel in Linux Kernel on 23 April 2015 at 08:39 AM EDT. Add A Comment
LINUX KERNEL --
Linux 4.1 will feature an updated Multiple Device (MD) driver to improve the RAID 5/6 potential for those relying upon Linux Software RAID.

Neil Brown sent in the md updates for Linux 4.1 this morning and explained, "more updates that usual this time. A few have performance impacts which should mostly be positive, but RAID5 (in particular) can be very work-load sensitive .... we'll have to wait and see."


The RAID 5 and RAID 6 modes can now batch multiple 4K-wide stripe heads to handle a full chunk-wide stripe as a single unit. The RAID 5/6 stripe cache now also grows and shrinks dynamically. RAID 6 specifically can now perform read-modify-write cycles for better performance on larger arrays of six or more devices.

Outside of the RAID 5/6 improvements, there's also experimental support for managing an MD RAID1 across a cluster using the Distributed Lock Manager.

Lastly, resync is now allowed to go faster than the minimum when there's competing I/O.

In total the MD updates for Linux 4.1 brings more than two-thousand lines of new code across more than sixty patches.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 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 OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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