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<TITLE>RE: [DRBD-user] write performance</TITLE>
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<P><FONT SIZE=2>Hi Anselm,<BR>
<BR>
There is one important thing in your setup that can be affecting your performance. You have defined the syncer rate as 20MBytes/second. The maximum theoretician performance that gigabit network can deliver is 125MBytes/second.<BR>
<BR>
you must change this:<BR>
syncer {<BR>
rate 20M;<BR>
al-extents 1024;<BR>
group 1;<BR>
}<BR>
<BR>
to this :<BR>
<BR>
syncer {<BR>
rate 125M;<BR>
al-extents 1024;<BR>
group 1;<BR>
}<BR>
<BR>
see if you have some difference in your speed.<BR>
<BR>
I would like to know more about what you are doing with lustre. are you documentating it ? can tell me more in private ? leonardo.mello at planejamento dot gov dot br<BR>
<BR>
I have some experience in gfs and ocfs2, and want to give lustre one try.<BR>
<BR>
Best Regards<BR>
Leonardo Rodrigues de Mello<BR>
<BR>
-----Original Message-----<BR>
From: drbd-user-bounces@lists.linbit.com on behalf of Anselm Strauss<BR>
Sent: qua 23/8/2006 06:20<BR>
To: drbd-user@lists.linbit.com<BR>
Cc: <BR>
Subject: [DRBD-user] write performance<BR>
<BR>
<BR>
resource lustre1 {<BR>
protocol C;<BR>
disk {<BR>
on-io-error detach;<BR>
}<BR>
net {<BR>
max-buffers 8192;<BR>
sndbuf-size 512k;<BR>
max-epoch-size 8192;<BR>
}<BR>
syncer {<BR>
rate 20M;<BR>
al-extents 1024;<BR>
group 1;<BR>
}<BR>
on tnode1 {<BR>
device /dev/drbd0;<BR>
disk /dev/sda9;<BR>
address 10.0.0.5:7788;<BR>
meta-disk internal;<BR>
}<BR>
on tnode2 {<BR>
device /dev/drbd0;<BR>
disk /dev/sda9;<BR>
address 10.0.0.6:7788;<BR>
meta-disk internal;<BR>
}<BR>
}<BR>
<BR>
It says sndbuf-size should not be set over 1M. Is it a problem if <BR>
sndbuf-size aggregated over multiple sections is above 1M?<BR>
<BR>
Cheers,<BR>
Anselm Strauss<BR>
<BR>
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<BR>
</FONT>
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