HDD/SSD Performance With MDADM RAID, BCache On Linux 4.14

Written by Michael Larabel in Storage on 26 September 2017 at 09:51 AM EDT. Page 4 of 4. 26 Comments.

BlogBench ran into problems with BCache's wirteback mode. There were kernel watchdog alerts about various CPU cores becoming stuck.

BCache's writeback mode helps with Dbench, but still doesn't come close to offering SSD-like speeds.

If you have been thinking about using BCache to act as a cache for a larger capacity hard drive, hopefully these latest numbers from the Linux 4.14 kernel were insightful. Likewise, if you have been thinking of buying two cheaper SSDs versus a single more expensive SSD, hopefully these reference numbers were of interest to you. If you would like to see how your Linux I/O performance compares to the results found in this article, simply install the Phoronix Test Suite and run phoronix-test-suite benchmark 1709250-TY-DISKTESTS31.

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About The Author
Michael Larabel

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 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 OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via MichaelLarabel.com.