> > [...] What puzzles me > > (among other things) is why do 5 of the drives show zero reads while 5 > of > > them show very low levels of read activity, and always the same 5 > drives? > > Can you identify how these drives are connected? If I recall correctly, > you're using port multipliers (because you have to); is there anything > like a pattern between the activity of drives and the PMPs or PMP > channels they're connected to? 'First think of which I thought, of course. I can't see one. 'Three different PMPs, with both symptoms present on all 3. 'Both Hitachi and WD drives with both symptoms. > To borrow your expression, PMPs have left me with a bad taste in my > mouth. 'Definitely not my favorite solution, either. If nothing else, the loss of a single PMP will at a minimum take the array offline. At worst, it may corrupt the drives unrecoverably. I think this less likely with a multi-lane controller. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
