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<DIV><FONT size=2>Run and send here, please:</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>vmstat 5</FONT></DIV>
<DIV><FONT size=2>(5 lines)</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>iostat -x 5</FONT></DIV>
<DIV><FONT size=2>(2 - 3 outputs)</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>top</FONT></DIV>
<DIV><FONT size=2>(1 screen)</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>slabtop (or equivalent, I dont remember)</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=arnold.maderthaner@j4care.com
href="mailto:arnold.maderthaner@j4care.com">Arnold Maderthaner</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=Sunil.Mushran@oracle.com
href="mailto:Sunil.Mushran@oracle.com">Sunil Mushran</A> ; <A
title=ocfs2-users@oss.oracle.com
href="mailto:ocfs2-users@oss.oracle.com">ocfs2-users@oss.oracle.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, August 23, 2007 4:12
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Ocfs2-users] Slow
concurrent actions on the same LVM logicalvolume</DIV>
<DIV><BR></DIV>Hi !<BR><BR>I watched the servers today and noticed that the
server load is very high but not much is working on the
server:<BR>server1:<BR> 16:37:11 up 32 min, 1 user, load
average: 6.45, 7.90, 7.45<BR>server2:<BR> 16:37:19 up 32 min, 4
users, load average: 9.79, 9.76, 8.26<BR>i also tried to do some selects
on the oracle database today.<BR>to do a "select count(*) from xyz" where xyz
has 120 000 rows it took me about 10 sec. <BR>always the process who does the
filesystem access is the first one. <BR>and every command
(ls,du,vgdisplay,lvdisplay,dd,cp,....) which needs access to a ocfs2
filesystem seams like blocking or it seams to me that there is a lock.<BR>Can
anyone please help me ?<BR><BR>yours<BR><BR>Arnold<BR><BR>
<DIV><SPAN class=gmail_quote>On 8/22/07, <B class=gmail_sendername>Arnold
Maderthaner</B> <<A
href="mailto:arnold.maderthaner@j4care.com">arnold.maderthaner@j4care.com</A>>
wrote:</SPAN>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">There
is not really a high server load when writing to the disks but will try it
asap. what do you mean with AST ? <BR>Can I enable some debuging on ocfs2 ?
We have 2 Dell servers with about 4gb of ram each and 2 Dual Core CPUs with
2GHZ each. <BR>Can you please describe which tests todo again ? <BR><BR>Thx
for your help<BR><BR>Arnold
<DIV><SPAN class=e id=q_1148eae43fbcfbe1_1><BR><BR>
<DIV><SPAN class=gmail_quote>On 8/22/07, <B class=gmail_sendername>Sunil
Mushran </B><<A onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:Sunil.Mushran@oracle.com" target=_blank>
Sunil.Mushran@oracle.com</A>> wrote:</SPAN>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">Repeat
the first test. This time run top on the first server. Which <BR>process
is eating the cpu? From the time it appears that the second<BR>server is
waiting for the AST that the first server is slow to send. And<BR>it could
be slow because it may be busy flushing the data to disk.<BR>How much
memory/cpu do these servers have?<BR><BR>As far as the second test goes,
what is the concurrent write performance<BR>directly to the LV (minus
fs).<BR><BR>On Wed, Aug 22, 2007 at 01:14:02PM +0530, Arnold Maderthaner
wrote: <BR>> Hi 2 all !<BR>><BR>> I have problems with concurrent
filesystem actions on a ocfs2<BR>> filesystem which is mounted by 2
nodes. OS=RH5ES and OCFS2=1.2.6<BR>> F.e.: If I have a LV called testlv
which is mounted on /mnt on both <BR>> servers and I do a "dd
if=/dev/zero of=/mnt/test.a bs=1024<BR>> count=1000000" on server 1 and
do at the same time a du -hs<BR>> /mnt/test.a it takes about 5 seconds
for du -hs to execute:<BR>> 270M
test.a<BR>><BR>> real 0m3.627s<BR>>
user 0m0.000s<BR>> sys
0m0.002s<BR>><BR>> or even longer. If i do a du -hs ond a file which
is not written by<BR>> another server its fast:<BR>>
977M test.b<BR>><BR>>
real 0m0.001s<BR>>
user 0m0.001s<BR>> sys
0m0.000s<BR>><BR>> If I write 2 different files from both servers to
the same LV I get<BR>> only 2.8mb/sec.<BR>> If I write 2 different
files from both servers to a different LV <BR>> (testlv,test2lv) then I
get about 30mb/sec on each write (so 60mb/sec<BR>> combined which is
very good).<BR>> does anyone has an idea what could be wrong. Are there
any mount<BR>> options for ocfs2 which could help me? is this a lvm2 or
ocfs2 problem <BR>> (locking,blocking,.... issue) ?<BR>><BR>> Any
help will be appriciated.<BR>><BR>> yours<BR>><BR>>
Arnold<BR>> --<BR>> Arnold Maderthaner<BR>> J4Care
Inc.<BR>><BR>> _______________________________________________
<BR>> Ocfs2-users mailing list<BR>> <A
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:Ocfs2-users@oss.oracle.com"
target=_blank>Ocfs2-users@oss.oracle.com</A><BR>> <A
onclick="return top.js.OpenExtLink(window,event,this)"
href="http://oss.oracle.com/mailman/listinfo/ocfs2-users"
target=_blank>http://oss.oracle.com/mailman/listinfo/ocfs2-users
</A><BR></BLOCKQUOTE></DIV><BR><BR clear=all><BR></SPAN></DIV><SPAN
class=sg>-- <BR>Arnold Maderthaner<BR>J4Care Inc.
</SPAN></BLOCKQUOTE></DIV><BR><BR clear=all><BR>-- <BR>Arnold
Maderthaner<BR>J4Care Inc.
<P>
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