On Thu, Jun 2, 2011 at 5:17 PM, Neil Harris <neil(a)tonal.clara.co.uk> wrote:
On 03/06/11 00:44, Mark Wagner wrote:
On Thu, Jun 2, 2011 at 16:11, Neil
Tape is -- still -- your friend here. Flip the
writing, have two sets of off-site tapes, one copy of each in each of
two secure and widely separated off-site locations run by two different
organizations, and you're sorted.
The mechanics of the backup are largely
irrelevant. What matters are
the *policies*: what data do you back up, when do you back it up, how
often do you test your backups, and so on. Once you've got that
sorted out, it doesn't really matter whether you're storing the
backups on tape, remote servers, or magic pixie dust.
You're right about procedures, but you can't begin defining procedures
until you have something concrete to aim at.
Tape is the One True Way for large scale backup, even today (ask
Google), and I thought it might be useful to give an illustration of
just how cheap it would be to use. Tape is a great simplifier, and
eliminates a lot of the fanciness and feature-bloat associated with more
sophisticated systems -- more sophisticated is not necessarily better.
I have done large enterprise scale backup (not Google-scale, but there
really isn't anyone else at Google's scale...) entirely without tape,
just using nearline disk. These days it's in fact not unreasonable to
do it that way. Offsiting the backups via networks versus physical
tape moves are pretty much equivalent here.
That is neither here nor there to the policy question, however.
I think this is an area that I, as a technical domain expert, wish I
knew more about the WMF operations staff detailed implementation and
plans here; but the staff are competent folks and I don't know of any
actual gaps from reasonable industry practice.
If the community is sufficiently concerned that there may be a gap,
then the board should perhaps either request staff to be more open, or
get an independent consultant in to review if operational details are
thought to be sensitive.
-george william herbert