On Wednesday 10 August 2011 02:56 AM, Joey McDonald wrote: > Hello all, > > I've configured 4 bricks over a GigE network, however I'm getting very > slow performance for writing to my gluster share. > > Just set this up this week, and here's what I'm seeing: A few questions - 1. Are these baremetal systems or are they Virtual machines ? 2. What is the amount of RAM of each of these systems ? 3. How many CPUs do they have ? 4. Can you also perform the dd on /gluster as opposed to /root to check the backend performance ? 5. What is your disk backend ? Is it direct attached or is it an array ? 6. What is the backend filesystem ? 7. Can you run a simple scp of about 10M between any two of these systems and report the speed ? Pavan > > [root at vm-container-0-0 ~]# gluster --version | head -1 > glusterfs 3.2.2 built on Jul 14 2011 13:34:25 > > [root at vm-container-0-0 pifs]# gluster volume info > > Volume Name: pifs > Type: Distributed-Replicate > Status: Started > Number of Bricks: 2 x 2 = 4 > Transport-type: tcp > Bricks: > Brick1: vm-container-0-0:/gluster > Brick2: vm-container-0-1:/gluster > Brick3: vm-container-0-2:/gluster > Brick4: vm-container-0-3:/gluster > > The 4 systems, are each storage bricks and storage clients, mounting > gluster like so: > > [root at vm-container-0-1 ~]# df -h /pifs/ > Filesystem Size Used Avail Use% Mounted on > glusterfs#127.0.0.1:pifs > 1.8T 848M 1.7T 1% /pifs > > iperf show's network through put looking good: > > [root at vm-container-0-0 pifs]# iperf -c vm-container-0-1 > ------------------------------------------------------------ > Client connecting to vm-container-0-1, TCP port 5001 > TCP window size: 16.0 KByte (default) > ------------------------------------------------------------ > [ 3] local 10.19.127.254 port 53441 connected with 10.19.127.253 port 5001 > [ ID] Interval Transfer Bandwidth > [ 3] 0.0-10.0 sec 1.10 GBytes 941 Mbits/sec > > > Then, writing to the local disk is pretty fast: > > [root at vm-container-0-0 pifs]# dd if=/dev/zero of=/root/dd_test.img bs=1M > count=2000 > 2000+0 records in > 2000+0 records out > 2097152000 bytes (2.1 GB) copied, 4.8066 seconds, 436 MB/s > > However, writes to the gluster share, are abysmally slow: > > [root at vm-container-0-0 pifs]# dd if=/dev/zero of=/pifs/dd_test.img bs=1M > count=2000 > 2000+0 records in > 2000+0 records out > 2097152000 bytes (2.1 GB) copied, 241.866 seconds, 8.7 MB/s > > Other than the fact that it's quite slow, it seems to be very stable. > > iozone testing shows about the same results. > > Any help troubleshooting would be much appreciated. Thanks! > > --joey > > > > > > > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
