Harold Hannelius, 

If you are using the "cp" utility to copy into Gluster then you may be running 
into a problem with use of an extremely small record size coupled with write 
replication overhead, try 
dd if=/dev/zero of=/gluster/test.dd bs=1024k count=256
Which uses a 1-MB write size, and see if that behaves differently.
I'm not a debian expert but in RHEL5.3 the "cp" utility record size was 4 KB 
and in RHEL6.2 the same utility has a 32-KB I/O size, you can check using 
strace utility.
For small-write-size utilities you can also try NFS to Gluster server, since 
NFS client aggregates writes.
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