Date: Wed, 10 Aug 2011 08:16:16 -0700 From: perryh@pluto.rain.com To: cswiger@mac.com Cc: freebsd-stable@freebsd.org, daniel@digsys.bg Subject: Re: 32GB limit per swap device? Message-ID: <4e42a0c0.e2t/9MF98O3HFjb1%perryh@pluto.rain.com> In-Reply-To: <935F8EC2-88E0-45A3-BE8B-7210BE223BC5@mac.com> References: <4E4143A6.6030307@digsys.bg> <935F8EC2-88E0-45A3-BE8B-7210BE223BC5@mac.com>
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Chuck Swiger <cswiger@mac.com> wrote:
> On Aug 9, 2011, at 7:26 AM, Daniel Kalchev wrote:
> > I am trying to set up 64GB partitions for swap for a system that
> > has 64GB of RAM (with the idea to dump kernel core etc). But, on
> > 8-stable as of today I get:
> >
> > WARNING: reducing size to maximum of 67108864 blocks per swap unit
> >
> > Is there workaround for this limitation?
>
> Apparently, the 32GB swapspace limit is per swap area; you can add
> up to 4 swap areas so create two or three 32GB swap partitions.
Will that enable a 64GB dump? In 8.1, dumpon(8) says:
The dumpon utility is used to specify a device where the kernel
can save a crash dump in the case of a panic.
...
For most systems the size of the specified dump device must be
at least the size of physical memory.
...
The dumpon utility will refuse to enable a dump device which is
smaller than the total amount of physical memory as reported by
the hw.physmem sysctl(8) variable.
Note the use of the singluar: "a device" and "the specified device".
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