From: John D. <dre...@gm...> - 2011-01-27 16:08:20
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On Thu, Jan 27, 2011 at 10:48 AM, Graham Keeling <gr...@eq...> wrote: > On Thu, Jan 27, 2011 at 09:45:29AM -0500, Phil Stracchino wrote: >> On 01/27/11 09:28, Graham Keeling wrote: >> > I shall summarise what I thought I had already said, because it is quite clear >> > to me. >> > >> > You have a terabyte disk that you want to use for backups. >> > >> > You split it into 100 Volumes, set 10GB max volume size each, and 1 job >> > per volume. >> > >> > All your backup jobs are 5KB. >> > You can then only use 500KB of disk space before you run out of volumes. >> >> Assuming that you've also set max volumes = 100. >> >> However, I believe in this case the problem is summarized by PEBCAK. If >> all of your backup jobs are 5KB, this would be a completely >> brain-damaged way to set up your storage. > > Please don't be deliberately obtuse. > The point of the example is to use an extreme to easily demonstrate real > problems. > I used the specific figure of 5KB to provide continuity with your own example > in which you used the same figure. > > > The same problems exist in more realistic situations. > > Assuming that I somehow know that all my backups will range from 100MB to 10GB, > then what should I set? > > a) 10000 volumes, 100MB max size? > b) 100 volumes, 10GB max size? > How about c) 200 volumes of 5GB max size. I use this for my disk based backups at home. At work I am 99.9% tape. John |