On Sun, 09 Oct 2011 13:32:16 +0200 Alexander Kühn <alexander.kuehn@xxxxxxxxxx> wrote: > > Zitat von NeilBrown <neilb@xxxxxxx>: > > > http://neil.brown.name/blog/20110216044002#5 > > Using one bit per stripe looks like the natural choice to me, no? It might seem natural, but that doesn't mean it is good. My rule-of-thumb is that each bit should correspond to about one second of resync time. So that is probably 50-100MB these days. So a 4TB drive would have 40,000-80,000 bits or be 5KB to 10KB in size. I would probably rather a 4KB bitmap, so each bit could correspond to 2-3 seconds which is probably fine. That might line up with the stripe size, or it might not. And whether is does or not is largely irrelevant to the code. NeilBrown
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