Commits on Jul 26, 2021

1. Increase default volblocksize from 8KB to 16KB. …

   Many things has changed since previous default was set many years ago.
   Nowadays 8KB does not allow adequate compression or even decent space
   efficiency on many of pools due to 4KB disk physical block rounding,
   especially on RAIDZ and DRAID.  It effectively limits write throughput
   to only 2-3GB/s (250-350K blocks/s) due to sync thread, allocation,
   vdev queue and other block rate bottlenecks.  It keeps L2ARC expensive
   despite many optimizations and dedup just unrealistic.
   
   In FreeNAS/TrueNAS we for years default to at least 16KB volblocksize
   for mirror pools and even bigger (32-64KB) for RAIDZ, and so far we
   can find very few scenarios (not synthetic benchmarks) when smaller
   blocks would show sufficient benefits.
   
   Signed-off-by: Alexander Motin <mav@FreeBSD.org>

   

   amotin committed Jul 26, 2021
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