On 05/13/2014 07:27 PM, Vadims Korsaks wrote:
Citējot Humble Devassy Chirammal
<humble.deva...@gmail.com> :
|
| Citējot Vijay Bellur <vbel...@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
The option "Optimize for Virt store" is available when you select a
volume in Ovirt - both as a right click menu option as well as a button
in the top sub navigation bar.
You also can check this option while creating a gluster volume using the
oVirt GUI
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