On 16/02/2015 10:04, Chris Murphy wrote: > This is a recent benchmarking using Postmark which supposedly > simulates mail servers. XFS stacks up a bit better than ext4. > http://www.phoronix.com/scan.php?page=article&item=linux-3.19-ssd-fs&num=3 > > A neat trick for big busy mail servers that comes up on linux-raid@ > and the XFS list from time to time, is using md linear/concat to put > together the physical drives into a single logical block device, and > then format it XFS. XFS will create multiple AG's across all of those > devices, and do parallel writes across all of them. It's often quite a > bit better performing than raid0 specifically because of the many > thousands of small files in many directories workload. Hey Chris, I am unsure I understand what you wrote. "XFS will create multiple AG's across all of those devices," Are you comparing md linear/concat to md raid0? and that the upper level XFS will run on top them? (Just to make sure I understood what you have written.) Eliezer