Thomas E. Spanjaard wrote:
Bill Hacker wrote:
Thomas E. Spanjaard wrote:
Stilyan Tsenov wrote:
I can't uderstand whether snapshots are filesystems or files ?...or
just both possible ?
A snapshot of a filesystem needs support from the filesystem to be
snapshottable, e.g. temporary suspension of all activities on that
filesystem while the snapshot-taking is in-progress.
.. except for Plan 9, where the 'snapshot' was basically a byproduct
of the way updates were done - i.e. change (and date) only what HAD
changed, preserve all else - even if no longer 'valid'.
That sounds like a transactional filesystem with versioning :).
Cheers,
In a way, yes.
Definitely worth a read, [1] as it is surprisingly efficient of storage over
long-term (previous citation), given the level of snapshot granularity provided.
I have installed a Plan 9 variant - 'Inferno' [2] under OS X. Works OK, but I
have not done much with it - least of all with the 'native' fs'en. It supposedly
plays pretty well with other OS'en.
I'd like to set up a couple of spare servers to use with various *BSD 'flavors'
- OS X included as a long-lived 'universal' remote storage test [3].
Can share those (have a rack in a data center with decent b/w) if anyone wants
to make a sub-project out of it.
The 1U units, save one in need of rebuild, are modest Via C3 for low-power
cosumption, so no great shakes at a make world cycle. That said, they are 'due'
for migration from 4.11 FreeBSD to DFLY, as I don't see FreeBSD 6.X being as
efficient on 'austere' uni processor servers.
For myself, trying to finish renovating a house in Virginia, sell out and move
to Asturias, so I have more spare server capacity than time this year.
Sort of a 'side issue' to DFLY, so an OFF LIST reply would probably be more
appropriate until I/we have something to contribute back to the main line.
Bill
[1]
http://plan9.bell-labs.com/wiki/plan9/documentation/index.html
http://plan9.bell-labs.com/wiki/plan9/Setting_up_Venti/index.html
http://plan9.bell-labs.com/wiki/plan9/Setting_up_Fossil/index.html
http://plan9.bell-labs.com/wiki/plan9/Mirroring_with_Fossil_and_Venti/index.html
[2]
http://www.vitanuova.com/inferno/index.html
[3]
How soon we forget how many times we have had to 'migrate' files we wished to
keep, and how much of a hassle it often was. CP/M -> DRDOS > OS/2 -> the *BSD's
here. Life is *slightly* simpler since I always install OS X with ufs-only fs,
not hfs, so at least naming is common with other *BSD's.
