Bob Friesenhahn <[EMAIL PROTECTED]> wrote:
> On Mon, 21 Apr 2008, Dana H. Myers wrote:
>
> > Bob Friesenhahn wrote:
> >> Are there any plans to support ZFS for write-only media such as optical
> >> storage? It seems that if mirroring or even zraid is used that ZFS would
> >> be a good basis for long term archival storage.
> > I'm just going to assume that "write-only" here means "write-once,
> > read-many", since it's far too late for an April Fool's joke.
>
> Yes, of course. Such as to CD-R, DVD-RW, or more exotic technologies
> such as holographic drives (300GB drives are on the market). For
> example, with two CD-R drives it should be possible to build a ZFS
> mirror on two CDs, but the I/O to these devices may need to be done in
> a linear sequential fashion at a rate sufficient to keep the writer
> happy, so temporary files (or memory-based buffering) likely need to
> be used.
CD-R media is not really WORM (write once read many) as CD-R does not allow
to write _every_ sector exactly once. Due to the way scrambeled error correction
is implemented, there is always unusable 7 sectors between two areas on the
medium that have been written independently.
Jörg
--
EMail:[EMAIL PROTECTED] (home) Jörg Schilling D-13353 Berlin
[EMAIL PROTECTED] (uni)
[EMAIL PROTECTED] (work) Blog: http://schily.blogspot.com/
URL: http://cdrecord.berlios.de/old/private/ ftp://ftp.berlios.de/pub/schily
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