Definitely do a 3 device raid with 2 always on devices and a 3rd swappable.
As far as an automated script to sync the drives, I say DONT DO IT! your
best bet is to make a script that adds the drive to the mirror set, waits
for it to sync completely, and then removes it from the set. then you can
fire that off manually.
*ALTERNATIVE*
if you get an external drive with a button on it that is used to launch a
quick backup or something, you should be able to get to that button as it
would be a usb device on the system and you could write a script that
watches that device for a certain code(the one for the button being pressed)
as well as makes sure it is the only copy of the script running and have the
run on the hotplug of the drive, and killed on unplug. you could also do
the same thing with a button on a serial port or on usb or something or even
a keyboard combination on the console(Ctrl+Alt+Meta+B)
On Fri, Jul 18, 2008 at 8:52 AM, Holger Parplies <[EMAIL PROTECTED]> wrote:
> Hi,
>
> Adam Goryachev wrote on 2008-07-16 12:00:23 +1000 [Re: [BackupPC-users]
> Howto backup BackupPC running on a RAID1 with mdadm for offline-storage]:
> > [...]
> > Holger Parplies wrote:
> > > Are you sure you want that Windoze-type-oh-no-feeling when you plug a
> USB
> > > stick with valuable data into the computer and it automatically fills
> it
> > > with the first few GBs of your BackupPC pool? :) Not sure if sfdisk
> will
> > > allow the partition table to exceed the device size though ...
> >
> > You should be able to recognise the UUID or similar of the drive, to
> > ensure that it is the drive you want to deal with (or one of the
> > multiple drives you want to deal with).
>
> yes, and I appreciate the simplicity of simply plugging in the drive and
> everything happening automatically. *But* we are speaking of administrative
> operations here, not a fancy end-user interface. There's always the chance
> you want to plug in the (correct, recognized) drive for a different reason,
> such as checking its SMART status, copying the image, accessing a previous
> version of your BackupPC pool, reading the serial number or because you got
> drives confused and think it's your transportable photo collection. Chances
> are, you shouldn't be doing that on the BackupPC server. Chances are, you
> should be aware of what will happen. But still: extensive, potentially
> destructive operations happening automatically without a chance of user
> interaction is something that belongs in the world of Windoze. Linux is
> becoming more like that fast enough already, so I won't let this chance
> pass
> to argument against it :-).
>
> Of course there's also the chance of you simply plugging the drive in at an
> inappropriate moment, when you wouldn't want the sync to happen. You might
> notice it when logging in to call the script to start the sync, but you
> won't
> log in just to check, if you went to the trouble of automating the sync in
> the
> first place, will you?
>
> Just because you *can* automate something, that doesn't necessarily mean
> it's
> a good idea to do it. Then again, under some circumstances it may well be.
>
> Regards,
> Holger
>
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