On Sat, May 07, 2011 at 07:07:26PM +0300, Asiye Yigit wrote: > Hello all; > > ?t is recommended to add raid-5 log device to the volume to recover the > correct data in any case including system crash. > > However, I am trying to understand how the data and parity changes are logged > here? Do you know the structure of this area?
Not the specifics. I believe it is basically an intent log for the R5 volume. > Data and parity itself couldn't write here, if it is like that those area > should be big enough. Correct. It is just temporary. Once all writes are committed, then the data is not needed. So the log area can be quite small. > As far as i know, it is small area. > > What kind of information for each data and parity changes is holdin > here to re-paly the log? Presumably it is the full set of changes that will be made to the parity stripe. I suppose it could be just the subset of changes on a less-than-full-stripe write as well, but that gets into the nitty-gritty details which I don't know about. What level of information are you hoping for? -- Darren _______________________________________________ Veritas-vx maillist - Veritas-vx@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-vx
