[PC-BSD Testing] vfs.zfs.arch_max on 9.0 AMD64 (jan.13, 2011 snapshot)

Kris Moore kris at pcbsd.org
Thu Feb 3 07:02:07 PST 2011


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On 02/02/2011 16:25, Lars R. Noldan wrote:
> This afternoon I spent some time playing with the installer, and trying
> to set up my system with a ZFS /
> 
> In doing this one thing I came across was it seems to fail stamping boot
> on ADA0 if I don't set any swap partition.  In talking with a few people
> it came to my attention that ZFS will happily consume all the ram in
> your system if you don't put a limitation on it.
> 
> The default vfs.zfs.arch_max via the install DVD reports as.
> 
> PCBSD# sysctl vfs.zfs.arch_max
> vfs.zfs.arch_max: 9257951232
> 
> This shouldn't cause my system to fail as it has 12 gigs of ram in it. 
> However that seems like a rather high default for the installation
> media.  Wouldn't ~4gb be a much more sane setting, as I suspect most
> AMD64 users are not going to be on a machine with > 4gb of ram?
> 
> Thanks
> Lars

I guess the question would be what is the downside if we drop that max
size? They have it set to that by default already, so there must have
been a reason to pick it originally.


- -- 
Kris Moore
PC-BSD Software
iXsystems
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