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In Manchester we have been reinstalling data servers without drining since 2006. It was a must with dcache on the WNs. Originally the OS and data were on two different disks, but in the past couple of years, to support VOs other than atlas, we have converted a number of WNs to small data servers with raid0 on the two disks and we are reinstalling the OS without draining in this configuration too. cheers alessandra On 13/07/2010 21:28, Owen Mcshane wrote: > Quoting Ewan MacMahon <[log in to unmask]>: > >> Hi all, >> >> It strikes me that is should be possible in principle to >> upgrade the OS on a DPM disk server without draining it by >> simply installing the new OS over the old one and setting >> up a fresh install of the DPM pool node. All the file >> metadata is stored on the head node, and the files' physical >> paths won't change. >> >> However, I'm not aware of anyone doing this. Does this >> sound like it should work and has anyone actually tried? >> >> Or indeed does everyone do this routinely and I've just >> never noticed..... >> >> Ewan >> > > I've been doing this over the past day or so. > > Didn't "install the OS over the new one" though, kickstarted from > scratch to SL5, leaving the storage array intact. > > Owen