> > Is it possible, then to use the 1T drives > > combined with a like number of 1.5T to create a number (say, 6 or so) of > > 2.5T LVM volumes and then use mdadm to create a RAID 5 array assembled > from > > the virtual volumes? > > Yes, you could do that, though I think I'd use md to create 6 linear > sets, which are then combined into a RAID 5; I imagine md will perform > better than LVM for this task. I hadn't thought of that. > What I'd be much more inclined to do is create 2 RAID 5 sets, one of 1T > discs, and one of 1.5T discs, then combine the two using LVM. It just > feels more natural to me that way. In addition, while both setups will > tolerate one disc failure, yours will then only tolerate one particular > one of the remaining 11 failing (the companion drive in the LVM/linear > pair), and mine will tolerate a failure of any drive on the other RAID-5. I had thought of this, but then replacing the 1T + 1.5T pairs with 3T drives, which I expect to happen eventually, will be more difficult. I do of course realize it is a bit more frail, but once again, to be devastating it would have to have two drives fail during a period (as now) when the data on the main array is incomplete or the main array has failed. > Hope this is of interest. Oh, you bet! -- 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
