Citējot Humble Devassy Chirammal
<humble.devassy@gmail.com> :

>
>  |
>  | Citējot Vijay Bellur <vbellur@redhat.com> :
>  | >  On 05/11/2014 02:04 AM, Vadims Korsaks wrote:
>  | >  > HI!
>  | >  >
>  | >  > Created 2 node setup with oVirt 3.4 and
>  | CentOS 6.5, for storage created
>  | >  > 2 node replicated gluster (3.5) fs on same
>  | hosts with oVirt.
>  | >  > mount looks like this:
>  | >  > 127.0.0.1:/gluster01 on
>  | >  >
>  |
/rhev/data-center/mnt/glusterSD/127.0.0.1:_gluster01
>  | type fuse.glusterfs
>  | >  >
>  |
(rw,default_permissions,allow_other,max_read=131072)
>  | >  >
>  | >  > when i making gluster test with dd,
something
>  | like
>  | >  > dd if=/dev/zero bs=1M count=20000
>  | >  >
>  |
of=/rhev/data-center/mnt/glusterSD/127.0.0.1\:_gluster01/kaka
>  | >  > i'm gettting speed ~ 110 MB/s, so this is
>  | 1Gbps speed of ethernet adapter
>  | >  >
>  | >  > but with in VM created in oVirt speed is
>  | lower than 20 MB/s
>  | >  >
>  | >  > why there is so huge difference?
>  | >  > how can improve VMs disks speed?
>  | >  >
>  | >
>  | >  What are your gluster volume settings?
Have you
>  | applied the following
>  | >  performance tunables in gluster's virt
profile:
>  | >
>  | >  eager-lock=enable
>  | >  remote-dio=enable
>  | >
>  | >  Regards,
>  | >  Vijay
>  | >
>  | setting were:
>  | [root@centos155 ~]# gluster volume info gluster01
>  |
>  | Volume Name: gluster01
>  | Type: Replicate
>  | Volume ID: 436edaa3-ac8b-421f-aa35-68b5bd7064b6
>  | Status: Started
>  | Number of Bricks: 1 x 2 = 2
>  | Transport-type: tcp
>  | Bricks:
>  | Brick1: 10.2.75.152:/mnt/gluster01/brick
>  | Brick2: 10.2.75.155:/mnt/gluster01/brick
>  | Options Reconfigured:
>  | storage.owner-gid: 36
>  | storage.owner-uid: 36
>  |
>  |
>  | add your settings settings now it looks
>  |
>  | [root@centos155 ~]# gluster volume info gluster01
>  |
>  | Volume Name: gluster01
>  | Type: Replicate
>  | Volume ID: 436edaa3-ac8b-421f-aa35-68b5bd7064b6
>  | Status: Started
>  | Number of Bricks: 1 x 2 = 2
>  | Transport-type: tcp
>  | Bricks:
>  | Brick1: 10.2.75.152:/mnt/gluster01/brick
>  | Brick2: 10.2.75.155:/mnt/gluster01/brick
>  | Options Reconfigured:
>  | network.remote-dio: enable
>  | cluster.eager-lock: enable
>  | storage.owner-gid: 36
>  | storage.owner-uid: 36
>  |
>  |
>  | but this didn't affected performace in any
big way
>  | should hosts to be restarted?
>  |
>
>  glusterfs storage domain configuration GUI got
""Optimize for virt. store" option which have to
be enabled when configuring for virt store.
>
>
Ref#http://www.ovirt.org/Features/GlusterFS_Storage_Domain
>
>  If the configuration is manual,  you need to
set the group to 'virt' as shown below
>
>  #gluster volume set VOLNAME group virt
>
>  This will enable below options on gluster volume :
>
>  quick-read=off
>  read-ahead=off
>  io-cache=off
>  stat-prefetch=off
>  eager-lock=enable
>  remote-dio=on
>
>
>  Can you please make sure group has set properly ?
>
>  Also, invoke  "dd" with oflag=direct option and
check whether it helps ..
>
>
>  --Humble

tnx a lot!! now it's much better - from VM i can
get dd with ~ 60 MB/s
this is still ~ x2 lower than from host, but x3
better than it was before :)

BTW could not found "GUI got ""Optimize for virt.
store" option"  in oVirt 3.5