bhyve and vfs.zfs.arc_max, and zfs tuning for a hypervisor

[Victor Sudakov]

Dear Colleagues,

I have a FreeBSD 11.2 system with 32G RAM which I'm going to use as a
bhyve host with zvols and sparse zvols, with (almost) no
services/daemons of its own. 

Could you please clarify some points for me?

1. Does ARC actually cache zfs volumes (not files/datasets)?

2. If ARC does cache volumes, does this cache make sense on a hypervisor,
because guest OSes will probably have their own disk cache anyway.

3. Would it make sense to limit vfs.zfs.arc_max to 1/8 or even less of
total RAM, so that most RAM is available to guest machines?

4. What other zfs tuning measures can you suggest for a bhyve
hypervisor?


-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
2:5005/49 at fidonet http://vas.tomsk.ru/
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