mirror_zfs/man
shodanshok 887a3c533b
Increase L2ARC write rate and headroom
Current L2ARC write rate and headroom parameters are very conservative:
l2arc_write_max=8M and l2arc_headroom=2 (ie: a full L2ARC writes at
8 MB/s, scanning 16/32 MB of ARC tail each time; a warming L2ARC runs
at 2x these rates).

These values were selected 15+ years ago based on then-current SSDs
size, performance and endurance. Today we have multi-TB, fast and
cheap SSDs which can sustain much higher read/write rates.

For this reason, this patch increases l2arc_write_max to 32M and
l2arc_headroom to 8 (4x increase for both).

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Gionatan Danti <g.danti@assyoma.it>
Closes #15457
2023-11-08 16:30:47 -08:00
..
man1 RAID-Z expansion feature 2023-11-08 10:19:41 -08:00
man4 Increase L2ARC write rate and headroom 2023-11-08 16:30:47 -08:00
man5 Consistentify miscellaneous style on remaining manpages 2021-06-09 14:35:53 -07:00
man7 RAID-Z expansion feature 2023-11-08 10:19:41 -08:00
man8 RAID-Z expansion feature 2023-11-08 10:19:41 -08:00
Makefile.am Add zfs_prepare_disk script for disk firmware install 2023-09-21 08:36:26 -07:00