[Gluster-users] Gluster for Vmware

Peter Auyeung pauyeung at shopzilla.com
Tue Aug 26 06:18:06 UTC 2014 

You can use ctdb for nfs failover

But I do want to know if we can use native glusterfs client for vmware

Peter

On Aug 25, 2014, at 9:28 PM, "Chandrahasa S" <chandrahasa.s at tcs.com<mailto:chandrahasa.s at tcs.com>> wrote:

I am thinking to User Gluster Volume for creation of Data store in Vmware.

I can use NFS but I wont get  HA and Load balancing like glusterfs.

Chandra



From:        "John G. Heim" <jheim at math.wisc.edu<mailto:jheim at math.wisc.edu>>
To:        Chandrahasa S <chandrahasa.s at tcs.com<mailto:chandrahasa.s at tcs.com>>, gluster-users at gluster.org<mailto:gluster-users at gluster.org>
Date:        08/25/2014 06:49 PM
Subject:        Re: [Gluster-users] Gluster for Vmware
________________________________



Do you mean you want to mount a gluster volume on a virtual machine? You can do that the same way you'd do it on a real machine.  You can probably even create a brick on a virtual machine but I don't see much point in that.

But we regularly mount our gluster volume on virtual machines.  We use debian so it's as simple as this:

1. service glusterfs-server start
2. mount -t glusterfs localhost:/volumename /mountpoint



On 08/25/2014 12:06 AM, Chandrahasa S wrote:
Dear All,

Is there any way to use Glusterfs volume for Vmware environment.


Chandra.



From:        Ben Turner <bturner at redhat.com><mailto:bturner at redhat.com>
To:        Juan José Pavlik Salles <jjpavlik at gmail.com><mailto:jjpavlik at gmail.com>
Cc:        gluster-users at gluster.org<mailto:gluster-users at gluster.org>
Date:        08/22/2014 08:57 PM
Subject:        Re: [Gluster-users] Gluster 3.5.2 gluster, how does cache work?
Sent by:        gluster-users-bounces at gluster.org<mailto:gluster-users-bounces at gluster.org>
________________________________



----- Original Message -----
> From: "Juan José Pavlik Salles" <jjpavlik at gmail.com><mailto:jjpavlik at gmail.com>
> To: gluster-users at gluster.org<mailto:gluster-users at gluster.org>
> Sent: Thursday, August 21, 2014 4:07:28 PM
> Subject: [Gluster-users] Gluster 3.5.2 gluster, how does cache work?
>
> Hi guys, I've been reading a bit about caching in gluster volumes, but I
> still don't get a few things. I set up a gluster replica 2 volume like this:
>
> [root at gluster-test-1 ~]# gluster vol info vol_rep
> Volume Name: vol_rep
> Type: Replicate
> Volume ID: b77db06d-2686-46c7-951f-e43bde21d8ec
> Status: Started
> Number of Bricks: 1 x 2 = 2
> Transport-type: tcp
> Bricks:
> Brick1: gluster-test-1:/ladrillos/l1/l
> Brick2: gluster-test-2:/ladrillos/l1/l
> Options Reconfigured:
> performance.cache-min-file-size: 90MB
> performance.cache-max-file-size: 256MB
> performance.cache-refresh-timeout: 60
> performance.cache-size: 256MB
> [root at gluster-test-1 ~]#
>
> Then I mounted the volume with gluster client on another machine. I created
> an 80Mbytes file called 80, and here you have the reading test:
>
> [root at gluster-client-1 gluster_vol]# dd if=/mnt/gluster_vol/80 of=/dev/null
> bs=1M
> 80+0 records in
> 80+0 records out
> 83886080 bytes (84 MB) copied, 1,34145 s, 62,5 MB/s
> [root at gluster-client-1 gluster_vol]# dd if=/mnt/gluster_vol/80 of=/dev/null
> bs=1M
> 80+0 records in
> 80+0 records out
> 83886080 bytes (84 MB) copied, 0,0246918 s, 3,4 GB/s
> [root at gluster-client-1 gluster_vol]# dd if=/mnt/gluster_vol/80 of=/dev/null
> bs=1M
> 80+0 records in
> 80+0 records out
> 83886080 bytes (84 MB) copied, 0,0195678 s, 4,3 GB/s
> [root at gluster-client-1 gluster_vol]#

You are seeing the effect of client side kernel caching.  If you want to see the actual throughput for reads run:

sync; echo 3 > /proc/sys/vm/drop_caches; dd blah

Kernel caching happens on both the client and server side, when I want to see uncached performance I drop caches on both clients and servers:

run_drop_cache()
{
  for host in $MASTERNODE $NODE $CLIENT
  do
      ssh -i /root/.ssh/my_id root@${host} echo "Dropping cache on $host"
      ssh -i /root/.ssh/my_id root@${host} sync
      ssh -i /root/.ssh/my_id root@${host} "echo 3 > /proc/sys/vm/drop_caches"
  done
}

HTH!

-b

> Cache is working flawlessly, (even though that 80 Mbytes is smaller than the
> min-file-size value, but I don't care about it right now) what I don't get
> is where cache is being stored. Is it stored on the client side or on the
> server side? According to documentation, the io-cache translator could be
> loaded on both sides (client and server), how can I know where it is being
> loeaded? It looks like as it was being stored locally because of the speed,
> but I'd like to be sure.
>
> Thanks!
>
> --
> Pavlik Salles Juan José
> Blog - http://viviendolared.blogspot.com<http://viviendolared.blogspot.com/>
>
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org<mailto:Gluster-users at gluster.org>
> http://supercolony.gluster.org/mailman/listinfo/gluster-users
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