[d2n-analysis-talk] Disk Space Requirements

[Brad Sawatzky]

On Mon, 24 Jan 2011, Diana Parno wrote:

> By this rough calculation, the total disk space d2n needs for all of  
> its root files is 2.771 TB. We could halve this requirement by purging  
> replayed root files in favor of skimmed files, but this would require  
> us to re-replay runs (which could take up to a few days) if we  
> discover that we've missed something meaningful in the skim. (In  
> particular, at present the skim process does not save the THaRunInfo  
> information or the EVBBITE tree.) Additional disk space is of course  
> needed for code, analysis databases compiled over time (e.g. databases  
> of beam trips or of cut performance), and figures. If (as seems  
> likely) our runs go through multiple rounds of replays, then we may  
> need additional space if we don't want to delete Round-1-replayed  
> files before starting on replay Round 2.

Thanks for working the numbers Diana -- much appreciated.

I'll see if I can get another TB+ on the work disk for us.  If we hit
the barrier before the slow IT wheels turn, we should move the root
files we want to keep off the work disk onto the d2n.jlab.org RAID.

-- Brad

-- 
Brad Sawatzky, PhD <brads at jlab.org>  -<>-  Jefferson Lab / Hall C / C111
Ph: 757-269-5947  -<>-  Fax: 757-269-5235  -<>- Pager: brads-page at jlab.org
The most exciting phrase to hear in science, the one that heralds new
  discoveries, is not "Eureka!" but "That's funny..."   -- Isaac Asimov