[Gluster-users] 2 Nodes Replica, Locks

Erik Schwalbe erik.schwalbe at canoo.com
Sat Oct 29 14:37:01 UTC 2011

Hi Lisandro, 

Yes I have the same problems like you, as you can see here: 


I used Ubuntu 10.04.3 for the performance tests. 
Now I use Ubuntu 11.10 and it's a little bit better than the old Ubuntu. 
With bonnie++ you can see the problem: 


My setup is: 
-AMD Opteron Quad Core 2.2GHz 
-16GB RAM 
-12x WD 2TB HDD @ 7200rpm 
-10Gbit link between the servers 
zfs mount to /data. 
GlusterFS on top of zfs. 
During a dd test to the local glusterfs mount the system is very unresponsive. The CPU load for glusterd process is over 150%. CPU load of glusterfs process is only a little bit lower (120-130%). 
But this isn't a ubuntu problem. I saw the same behaviour during test with glusterfs (debian) and glusterfs (CentOS). 

Perheps the CPU is too slow ;-) 


----- Ursprüngliche Mail -----

Von: "Linux User" <grullonbb at gmail.com> 
An: gluster-users at gluster.org 
Gesendet: Samstag, 29. Oktober 2011 14:25:02 
Betreff: [Gluster-users] 2 Nodes Replica, Locks 

Hi guys, 
Is anyone else having the issues I am experiencing. For some reason, using the ubuntu and glusterfs_3.2.4-1_amd64.deb I get getting locks using glusterfs in top of ZFS, in some cases the machine would become unresponsive to keyboard strokes. Very strange, I mean everything mounts and all but it appears that the filesystem is causing some type of panic. IN another note, I also noticed that when creating a 1TB file using "if=/dev/zero of=LUN0 bs=1 count=0 seek=1T" the filesystem appear to freeze. I did a speed test in my volume and was getting about 1GB per second using 26 drive RAID 6. I am not sure but something is up with glusterfs and was wondering if other people are also having locking issues and additionally the split brain effect when using heartbeat and pacemaker in a 2 node replication. Thank you for any input. Lisandro 

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