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Re: Snapshots in tmpfs
On Thu, Feb 23, 2012 at 07:58:11AM +0000, David Holland wrote:
> On Wed, Feb 22, 2012 at 08:17:15AM -0600, David Young wrote:
> > On Wed, Feb 22, 2012 at 01:42:45PM +0100, Manuel Wiesinger wrote:
> > > *)
> > > What is it good for? The only practical use I can imagine are
> > > backups on thin clients, which operate without a hard disk. But this
> > > is clearly far-fetched, in my eyes.
> > It's good for writing checkpoints of a tmpfs to non-volatile (NV)
> > storage in an embedded system where writing to the NV storage is costly
> > (it wears out, or it is slow, or both). When you have a snapshot, you
> > can stream it to NV storage using pax(1). This is the best practical
> > way that I can think of in NetBSD at this time.
> other than, say, chfs or lfs?
Is CHFS really suitable for CompactFlash? Is LFS even usable?
> That sounds like a horrible hack, anyhow, and prone to dying horribly
> if you crash or lose power in the middle of a writeback. (plus you'd
> want to use rsync to transfer, or so I'd think, or rewriting
> unmodified blocks will burn write cycles faster than not bothering to
> do anything special.)
I agree that whatever you have in mind sounds like a horrible hack. :-)
dyoung%pobox.com@localhost Urbana, IL (217) 721-9981
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