Re: strange mirror write perf
From: Roman Mamedov <hidden>
Date: 2017-03-20 05:07:42
On Mon, 20 Mar 2017 01:44:09 +0100 Youenn Gestin [off-list ref] wrote:
abyss ~ # dd bs=1M count=2024 if=/dev/zero of=/dev/md/md6to conv=fdatasync 2024+0 records in 2024+0 records out 2122317824 bytes (2,1 GB, 2,0 GiB) copied, 14,5074 s, 146 MB/s I'll check about this function to see if i'll need it or not tomorow,
Instead of disabling it you can alter the bitmap chunk size, and at larger chunk sizes it does not affect the performance as much. http://tgharold.blogspot.fr/2013/01/mdadm-using-bitmaps-to-speed-up-rebuilds.html For 6TB drives try 256 or even 512MB for the size. -- With respect, Roman