On Tue, Aug 18, 2009 at 3:05 AM, Hiren Joshi<josh at moonfruit.com> wrote: > Hi, > > Ok, the basic setup is 6 bricks per server, 2 servers. Mirror the six > bricks and DHT them. > > I'm running three tests, dd 1G of zeros to the gluster mount, dd 1000 > 100k files and dd 1000 1M files. > > With 3M write-behind I get: > 0m35.460s for 1G file > 0m52.427s for 100k files > 1m37.209s for 1M files > > Then I added a 400M external journal to all the bricks, the twist being > the journals were made on a ram drive.... > > Running the same tests: > 0m33.614s for 1G file > 0m52.851s for 100k files > 1m31.693s for 1M files > > > So why is it that adding an external journal (in the ram!) seems to make > no difference at all? I would imagine that most of your bottle neck is with the network and not the disks. Modern raid disk storage systems are much quicker than gigabit ethernet. liam
