[Gluster-users] Arbiter performance issue

[Ravishankar N]

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 at 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 at fs134 wtg002]# cd ..
> [root at fs134 home]# cd wtg001
> [root at 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 at 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 at 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 at 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 at fs134 wtg001]#
>
>
>
>
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