[Gluster-users] What should I do to improve performance ?

[marianna cattani]

Hello Ben ,
whole infrastucture runs on 4 servers with SAS drives 7,200 rpm and a raid
controller LSI.

Probably the network is oversized compared to the disks and controllers .

To verify that libgfapi is operating, is enough that my vm's disks have
named as / dev / vd * ?

I'm not sure that I understand the test which you suggest , if this is my
mount point /var/lib/nova/instances I could run:

bonnie++ -d /var/lib/nova/instances -r 2048

then on the vm that use /var/lib/nova/instances i run the same thing ?

Is it right ?

BR

M.

2015-03-23 19:57 GMT+01:00 Ben Turner <bturner at redhat.com>:

> ----- Original Message -----
> > From: "marianna cattani" <marianna.cattani at gmail.com>
> > To: gluster-users at gluster.org
> > Sent: Monday, March 23, 2015 6:09:41 AM
> > Subject: [Gluster-users] What should I do to improve performance ?
> >
> > Dear all,
> > I followed the tutorial I read at this link :
> > http://www.gluster.org/documentation/use_cases/Virt-store-usecase/
> >
> > I have 4 nodes configured as a linked list , each node also performs
> virtual
> > machines with KVM and mounts on its ip address, like this:
> >
> > 172.16.155.12:/nova /var/lib/nova/instances glusterfs defaults,_netdev
> 0 0
> >
> > Each node has two nic (ten giga) bonded in mode 4.
> >
> > What can I do to further improve the speed ?
>
> What kind of disks are back ending your 10G NICs?  Are you using FUSE or
> libgfapi to connect to gluster from your hypervisor?  What kind of speeds
> are you expecting vs seeing in your environment?  We need to understand
> what your HW can do first then gather some data running on gluster and
> compare the two.  As a rule of thumb with replica 2 you should see about:
>
> throughput = ( NIC line speed / 2 ) - 20% overhead
>
> As long as your disks can service it.  If you are seeing about that on the
> gluster mounts then go inside one of the VMs and run the same test, the VM
> should get something similar.  If you aren't seeing at least 400 MB / sec
> on sequential writes and 500-700 MB /sec on reads then there may be
> something off in your storage stack.
>
> -b
>
> > BR.
> >
> > M.
> >
> > _______________________________________________
> > Gluster-users mailing list
> > Gluster-users at gluster.org
> > http://www.gluster.org/mailman/listinfo/gluster-users
>
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