[OpenAFS] Re: Feature wish: remove partition while fileserver keeps on running

Jason Edgecombe jason@rampaginggeek.com
Mon, 27 Feb 2012 18:18:38 -0500

On 02/27/2012 12:10 PM, Andrew Deason wrote:
> On Mon, 27 Feb 2012 17:00:31 +0100
> Lars Schimmer<l.schimmer@cgv.tugraz.at>  wrote:
>> (IMHO DAFS is only for volumes, not partitions, or?)
> Yes, but as Andy mentions, a restart with DAFS shouldn't be very
> noticeable (whether that is actually true depends on the environment and
> a lot of different factors, but in practice it seems to usually be the
> case). If you can do the work with the partition quickly, you should be
> able to 'bos shutdown -wait ; umount ; mount ; bos restart' without it
> really being noticed.
> It also _might_ be possible to offline all of the volumes on a partition
> without needing to move them, and fiddling with the partition. I'm not
> sure off-hand if we keep any lingering filehandles open in that case,
> but it might work. Of course, doing anything like that is unsupported,
> might break everything, etc etc.
> What I think would be an even more useful feature is the ability to
> detach and reattach a partition on another server (via SAN storage or
> whatever), since there aren't very good workarounds for that. If we
> could do that, we could also just detach a partition and reattach it to
> the same server again.
May I suggest an alternate approach?

In http://rt.central.org/rt/Ticket/Display.html?id=130561
I documented an idea about a "DoNotAttach" flag. While this would not 
allow for hot adds and hot removals, it would allow you to flag a 
/vicepX folder for removal. After that, just schedule a service restart.

Any comments?