On 10/22/2013 2:24 AM, David Brown wrote: > On 22/10/13 02:36, Steve Bergman wrote: > > <snip> > >> But hey, this is going to be a very nice opportunity for observing XFS's >> savvy with parallel i/o. > > You mentioned using a 6-drive RAID10 in your first email, with XFS on > top of that. Stan is the expert here, but my understanding is that you > should go for three 2-drive RAID1 pairs, and then use an md linear > "raid" for these pairs and put XFS on top of that in order to get the > full benefits of XFS parallelism. XFS on a concatenation, which is what you described above, is a very workload specific storage architecture. It is not a general use architecture, and almost never good for database workloads. Here most of the data is stored in a single file or a small set of files, in a single directory. With such a DB workload and 3 concatenated mirrors, only 1/3rd of the spindles would see the vast majority of the IO. -- Stan -- 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
