On Fri, May 30, 2014 at 09:55:29AM -0400, Mike Snitzer wrote: > So unless you have misaligned IO you _should_ be able to avoid reading > from the origin. But XFS is in play here.. I'm wondering if it is The filesystem is ext4. > If you set read_promote_adjustment to 0 it should pull the associated > blocks into the cache. What makes you think it isn't? The fio test is about twice as fast as when I ran the fio test directly on the hard disk array. This test runs about 5 times slower than when I ran it directly on the SSD. I'm not measuring the speed of the md5sum operation. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://people.redhat.com/~rjones/virt-top _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
