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Hi Wahid, thanks. 2. marking a disk read only making sam tests fail. - this is supposed to have been fixed I think - so maybe just my version ; but still happens to me and can be exceedingly irritating. it is indeed exceedingly irritating. cheers alessandra On 16/02/2012 09:27, Wahid Bhimji wrote: > Hi Alessandra > > To get the ball rolling, if it hasn't been rolling off list already... > For DPM my bits of good practise > (which make the most difference but probably are well known by you at least) are: > 1. mysqltuner.pl > 2. blockdev --setra > > My worst experiences are > 1. direct reading of files from servers with rfio not being performant > - this isn't so much a site issue though actually it is a bit of a problem in our shared setup where the local disk situation is not so great (both capacity devoted to scratch and performance) > - of course I am not so attached to rfio - direct reading with another protocol would be fine. > 2. marking a disk read only making sam tests fail. > - this is supposed to have been fixed I think - so maybe just my version ; but still happens to me and can be exceedingly irritating. > > Wahid > > > > > > >