On Mon, Mar 23, 2009 at 4:12 PM, Emmanuel Florac <eflorac@xxxxxxxxxxxxxx> wrote: > Le Mon, 23 Mar 2009 15:59:47 +0200 > Raz <raziebe@xxxxxxxxx> écrivait: > >> 1. redundancy. fair. less likely three disks will break in a single >> raid 2. performance. bad. >> 3. modularity. yes. grows >> 4. Size 24TB > > I don't understand why you'd have a bad performance here. I usually > notice a very slight difference between LVM and linux-raid raid0 in all > practical benchmarks. Did you use LVM striping capability? You may > have to adjust readahead (using blockdev --setra) on each > device /dev/dm-X and /dev/md-X) to achieve optimal performance. Problem i have with performance is that once you *add* to a active volume a new PE, you lose striping in the sense that you cannot tell where the IO is directed to ( which disk). My implementation relies on this fact. If you know I am wrong please correct me. > > -- > ---------------------------------------- > Emmanuel Florac | Intellique > ---------------------------------------- > > -- 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
