Has anyone had an issue with the ZFS ARC max being limited below what
has been defined in /boot/loader.conf? I just upgraded the RAM in a
ZFS-equipped system and attempted to devote 4GB to the ARC cache by
placing the following in loader.conf:
vfs.zfs.arc_max="4096M"
However, after rebooting, querying the sysctl gives me this:
$ sysctl vfs.zfs.arc_max
vfs.zfs.arc_max: 1726489600
or about 1.7GB, an odd number that I can't find any references to. For
reference, I'm running 8-STABLE (as of Jan 19th) on an amd64 system with
8GB of RAM. The system was previously very stable with 4GB of RAM and a
512MB arc_max. I have not modified vm.kmem_size_max (defaults to ~330GB
on amd64) or any other ZFS tunables. I'd also like to avoid syncing up
to the current 8-STABLE if at all possible.
Thanks,
Steve Polyack
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