On 11/30/2011 12:31 PM, Hans Christian Riksheim wrote:
I have 1 node where I want collocation, the rest not. [...] I think I just go for collocate=no.
Unless you have pretty specific reasons to mush the rest of them together, I'd call this a poor configuration. How many tapes do you have? Now envision _all_ of them being mounted for any restore, even a relatively small one. That's the end state of colloc=no: to a first approximation, every node, every filespace, every directory, is smeared across a maximum number of tapes, with no tendency to re-group data which is predictably related. Collocation is about paying, in unused tape space, for efficient restores; I'd suggest you view that as a bargain, not a burden. I recommend you leave colloc on, and rather than worry about rejiggering collocgroups every time you make a new node, rejigger them when your scratch count gets "low", whatever that means in your environment. Several folks here (including me) have posted the scripts they use to do their analysis and modifications, so it need not be a major time sink. - Allen S. Rout
