add hint about ZFS default ARC size

diff --git a/local-zfs.adoc b/local-zfs.adoc
index 563e0c58455aed1acca24c8e769fe86ed9033349..ff602ed13503587c79353ae3150fe05a8182a61f 100644 (file)
--- a/local-zfs.adoc
+++ b/local-zfs.adoc
@@ -276,9 +276,10 @@ other settings are optional.
 Limit ZFS memory usage
 ~~~~~~~~~~~~~~~~~~~~~~
 
 Limit ZFS memory usage
 ~~~~~~~~~~~~~~~~~~~~~~
 

-It is good to use max 50 percent of the system memory for ZFS arc to
-prevent performance shortage of the host. Use your preferred editor to
-change the configuration in /etc/modprobe.d/zfs.conf and insert:
+It is good to use maximal 50 percent (which is the default) of the
+system memory for ZFS ARC to prevent performance shortage of the
+host. Use your preferred editor to change the configuration in
+/etc/modprobe.d/zfs.conf and insert:

 
  options zfs zfs_arc_max=8589934592
 
 
  options zfs zfs_arc_max=8589934592