[Gluster-users] slow write perf for disperse volume

[Ingard Mevåg]

Hi
I've been playing with disperse volumes the past week, and so far i can not
get more than 12MB/s when i do a write test. I've tried a distributed
volume on the same bricks and gotten close to gigabit speeds. iperf
confirms gigabit speeds to all three servers in the storage pool.

The three storage servers have 10gig nics (connected to the same switch).
The client is for a now a docker container in a 2nd DC (latency roughly 8-9
ms).

dpkg -l|grep -i gluster
ii  glusterfs-client               3.10.1-ubuntu1~xenial1          amd64
     clustered file-system (client package)
ii  glusterfs-common               3.10.1-ubuntu1~xenial1          amd64
     GlusterFS common libraries and translator modules
ii  glusterfs-server               3.10.1-ubuntu1~xenial1          amd64
     clustered file-system (server package)

$ gluster volume info

Volume Name: DFS-ARCHIVE-001
Type: Disperse
Volume ID: 1497bc85-cb47-4123-8f91-a07f55c11dcc
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x (4 + 2) = 6
Transport-type: tcp
Bricks:
Brick1: dna-001:/mnt/data01/brick
Brick2: dna-001:/mnt/data02/brick
Brick3: dna-002:/mnt/data01/brick
Brick4: dna-002:/mnt/data02/brick
Brick5: dna-003:/mnt/data01/brick
Brick6: dna-003:/mnt/data02/brick
Options Reconfigured:
transport.address-family: inet
nfs.disable: on

Anyone know the reason for the slow speeds on disperse vs distribute?

kind regards
ingard
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