On Sun, 2013-07-07 at 11:45 -0500, Stan Hoeppner wrote: > Maybe an example will help. Is a 12 drive array faster than a 10 drive > array? Yes, of course. If your chassis holds 12 drives and you assign > two as spares, then you have 10 drives in your array. That's 20% > slower. If you keep spares on a shelf and hot swap them in after > failure, you can have all 12 drives in your array and not lose that 20% > performance. Ah... okay I see what you were talking about ... sure... but it's not the hot swap that will (directly) degrade performance... ist because you don't use all your slots and thereby not getting out the maxmimum performance gain possible due to the striping... > Well of course. By designing your storage with dissimilar drives to > avoid a rare, show stopping, firmware bug that may or may not be present > in a specific drive model, you're simultaneously exposing yourself to > other issues because the firmware doesn't match. Performance will be > suboptimal as your drives will have difference response times. Sure, but as said performance isn't the main goal... > Additionally, timeout and error handling will likely be different, > causing the same. Interpreting S.M.A.R.T. data will be difficult > because each of the drives will report various metrics differently, etc, > etc. So instead of only being required to become intimately familiar > with one drive model, you must do so for 4 or 5 drive models. Sure.. Thanks for your comments. Cheers, Chris.
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