On 05/14/2014 02:55 PM, Vadims Korsaks wrote:
Citējot "Sahina Bose" <[email protected]>:
On 05/14/2014 02:36 PM, Vadims Korsaks wrote:
Citējot Sahina Bose <[email protected]> :
On 05/13/2014 07:27 PM, Vadims Korsaks wrote:
Citējot Humble Devassy Chirammal
<[email protected]> :
Citējot Vijay Bellur <[email protected]> :
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
i have glusterfs as my master storage, but there
is nothing in volumes, empty. And i can't create
gluster volume, there is no choise in Data Center
and Volume Cluster.
To be able to manage gluster (i.e create volume,
add bricks and peer
probe hosts) from Ovirt UI, the cluster should
have the "Enable gluster
service" option checked. I think you may not
have enabled this when you
created the cluster. To use gluster volume as
storage domain, this
option is not required.
Hope this helps.
Ok, i see, tnx a lot.
any chances to change this for Default Cluster,
because i have self hosted engine and just 2 hosts?
You can edit the cluster and change this option. Please make sure that
vdsm-gluster is installed on the hosts in the cluster and a gluster peer
probe has been done if there are more than one hosts in the cluster.
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