Hi Ray,
thank for your answer.
We are using GFS1 on a Red Hat 5.4 cluster. GFS filesystem is mounted on
/mnt/gfs, and when we created such filesystem we used parameter "-p
lock_dlm". Anyway, look at this output :
[root@parmenides ~]# gfs_tool getsb /mnt/gfs
.........................
no_addr = 26
sb_lockproto = lock_dlm
sb_locktable = hr-pm:gfs01
no_formal_ino = 24
no_addr = 24
...............
For you information my cluster.conf file is:
-------------------------------------------------------------------------------------------------------------------------------
<?xml version="1.0"?>
<cluster config_version="4" name="hr-pm">
<fence_daemon post_fail_delay="0" post_join_delay="3"/>
<clusternodes>
<clusternode name="zipi" nodeid="1" votes="1">
<fence>
<method name="1">
<device modulename="" name="DRAC_heraclito"/>
</method>
</fence>
</clusternode>
<clusternode name="zape" nodeid="2" votes="1">
<fence>
<method name="1">
<device modulename="" name="DRAC_parmenides"/>
</method>
</fence>
</clusternode>
</clusternodes>
<cman expected_votes="1" two_node="1"/>
<fencedevices>
<fencedevice agent="fence_drac" ipaddr="10.0.0.207" login="root"
name="DRAC_heraclito" passwd="*****"/>
<fencedevice agent="fence_drac" ipaddr="10.0.0.208" login="root"
name="DRAC_parmenides" passwd="******"/>
<fencedevice agent="fence_ipmilan" auth="md5" ipaddr="10.0.0.207"
login="root" name="IPMILan_heraclito" passwd="*"/>
<fencedevice agent="fence_ipmilan" auth="md5" ipaddr="10.0.0.208"
login="root" name="IPMILan_parmenides" passwd="*"/>
</fencedevices>
<rm>
<failoverdomains/>
<resources/>
</rm>
</cluster>
-------------------------------------------------------------------------------------------------------------
Shared disk is a LUN on a fibber channel SAN.
The most surprising thing is that we have another similar cluster, and
there we get "98 locks/sec" always, starting the ping_pong in one or in
both nodes. Buf! I'm lost! What is happening?
Frank
Date: Wed, 2 Dec 2009 06:58:43 -0800 From: Ray Van Dolson
<rvandolson@xxxxxxxx> Subject: Re: GFS performance
test To: linux-cluster@xxxxxxxxxx Message-ID:
<20091202145842.GA16292@xxxxxxxx> Content-Type: text/plain;
charset=us-ascii On Wed, Dec 02, 2009 at 03:53:46AM -0800, frank wrote:
> Hi,
> after seeing some posts related to GFS performance, we have decided to
> test our two-node GFS filesystem with ping_pong program.
> We are worried about the results.
>
> Running the program in only one node, without parameters, we get between
> 800000 locks/sec and 900000 locks/sec
> Running the program in both nodes over the same file on the shared
> filesystem, the lock rate did not drop and it is the same in both nodes!
> What does this mean? Is there any problem with locks ?
>
> Just for you info, GFS filesystem is /mnt/gfs and what I run in both
> nodes is:
>
> ./ping_pong /mnt/gfs/tmp/test.dat 3
>
> Thanks for your help.
>
Wow, that doesn't sound right at all (or at least not consistent with
results I've gotten:)
Can you provide details of your setup, and perhaps your cluster.conf
file? Have you done any other GFS tuning? Are we talking GFS1 or
GFS2?
I get in the 3000-5000 locks/sec range with my GFS2 filesystem (using
nodiratime,noatime and reducing the lock limit to 0 from 100 in my
cluster.conf file).
The numbers you provide I'd expect to see on a local filesystem.
Ray
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