Re: Arbiter performance issue

Ravishankar N <ravishankar@xxxxxxxxxx> · Wed, 30 Mar 2016 06:36:52 +0530



    On 03/30/2016 01:03 AM, Russell
      Purinton wrote:

    
      Hi all, sorry for 2 threads today, but I felt like this deserved a
      separate thread…
      

      I was trying to replace my replica 2 volumes with
        replica 3 arbiter 1 volumes…  The new volumes though are 10x
        slower on direct writes than their replica 2 counterparts.  Im
        wondering if this is to be expected or if I might have done
        something wrong?   I confirmed that no data is being written
        into the arbiter bricks, just meta data.
      

    It does look like a bug Russel. Another user had reported the same
    behavior. I'll take a look and update.

    Thanks,

    Ravi

    
         Here’s the tests I ran.   I did the dd tests
        multiple times with different file names, and they all had the
        same speeds ….
      

        [root@fs134 wtg002]# dd if=/dev/zero of=test
          bs=1M count=100 oflag=direct
        100+0 records in
        100+0 records out
        104857600 bytes (105 MB) copied, 9.49974 s,
          11.0 MB/s
        [root@fs134 wtg002]# cd ..
        [root@fs134 home]# cd wtg001
        [root@fs134 wtg001]# dd if=/dev/zero of=test
          bs=1M count=100 oflag=direct
        100+0 records in
        100+0 records out
        104857600 bytes (105 MB) copied, 0.888929 s,
          118 MB/s
        [root@fs134 wtg001]# gluster volume info wtg001
        

        Volume Name: wtg001
        Type: Distributed-Replicate
        Volume ID: 53179cfe-9896-4c94-9f1d-01dd474e027e
        Status: Started
        Number of Bricks: 2 x 2 = 4
        Transport-type: tcp
        Bricks:
        Brick1: xs141:/brick1/wtg001p0r0
        Brick2: xs138:/brick1/wtg001p0r1
        Brick3: xs139:/brick1/wtg001p1r0
        Brick4: xs140:/brick1/wtg001p1r1
        Options Reconfigured:
        nfs.disable: on
        performance.readdir-ahead: on
        [root@fs134 wtg001]# gluster volume info wtg002
        

        Volume Name: wtg002
        Type: Distributed-Replicate
        Volume ID: 410b67ad-bc1e-473b-b98f-ad431d7c9831
        Status: Started
        Number of Bricks: 2 x 3 = 6
        Transport-type: tcp
        Bricks:
        Brick1: xs141:/brick1/wtg001d2r0
        Brick2: xs138:/brick1/wtg001d2r1
        Brick3: xs139:/brick1/wtg001d2ra
        Brick4: xs139:/brick1/wtg001d3r0
        Brick5: xs140:/brick1/wtg001d3r1
        Brick6: xs141:/brick1/wtg001d3ra
        Options Reconfigured:
        nfs.disable: on
        performance.readdir-ahead: on
        [root@fs134 wtg001]# mount | grep wtg
        0:/wtg001 on /home/wtg001 type fuse.glusterfs
          (rw,default_permissions,allow_other,max_read=131072)
        0:/wtg002 on /home/wtg002 type fuse.glusterfs
          (rw,default_permissions,allow_other,max_read=131072)
        [root@fs134 wtg001]#
      
      
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