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RE: [Off-topic] Battery Backed NVRAM for journals ...



> Finally, however, we have to do journal replay --- looking for the
> most uptodate copies of each block in the journal and writing them
> back to disk.  This is again a sequential scan through the journal,
> but the writebacks are NOT sequential and can cause a lot of seeking.
> I suspect that that is where the bulk of the time is spent.

What about sorting those writebacks before commiting them to disk? Or
should the disksubsystem take care of that trough that elevator-alg.?


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