On Mon, Feb 16, 2015 at 12:07 AM, Michael Schumacher <michael.schumacher at pamas.de> wrote: > Btw., are you sure you want to use XFS for a mail server? I made some > tests about a year ago and found that EXT4 is by the factor 10 faster > compared to XFS. The tests I performed were using the "maildir" style > postfix installation that results in many thousands files in the user > directories. 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. -- Chris Murphy