9.0 crash, ssd or filesystem problem?
Warren Block
wblock at wonkity.com
Sun Nov 18 02:50:05 UTC 2012
On Sat, 17 Nov 2012, Gary Aitken wrote:
>> There was a nice Sun white paper by Peter Snyder on tmpfs. It's linked on the Wikipedia tmpfs page, but Oracle has broken the link. Google has a rendered version of a PostScript copy (long URL):
>> http://webcache.googleusercontent.com/search?q=cache:EXMeqvhFfrsJ:www.sun3arc.org/papers/OS/tmpfs_virtual_memory_filesystem.ps.gz+tmpfs+white+paper&cd=12&hl=en&ct=clnk&gl=us
>
> Thanks.
> Interesting, I would have thought swap space for something in a tmpfs was
> not allocated until it needed to be swapped out. As I read it, used tmpfs
> space reserves space in swap.
It uses VM, so tmpfs is a memory disk until you run low on memory, then
it gets swapped out. But until then, it's a RAM disk, with the added
benefit of not eating a fixed chunk of RAM all the time.
Oh, and unless you have a very recent -STABLE or -HEAD, see
http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/168544
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