<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=gb2312">
<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta name=Generator content="Microsoft Word 14 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:"Arial Unicode MS";
panose-1:2 11 6 4 2 2 2 2 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:"\@Arial Unicode MS";
panose-1:2 11 6 4 2 2 2 2 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Balloon Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I¡¯m running BIND on CentOS 5.3 on 12 Cache only DNS Servers (recursive), its BIND 9.3 its bit outdated yes, planning to upgrade to latest bind on Ubuntu server along with the hardware.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>These DNS Server sometime is serving around 17Mbps of DNS queries on peak hour, 16 Cores, only around 12% utilization on each cores, 16GB RAM. <o:p></o:p></p><p class=MsoNormal>Now the problem is sometimes (not quite often, just seldomly) Named on one of this server is just plain not responding, the process is still there but just not responding to any queries, when this happened the only way to revive it is to kill the PID and restart the named service, plain service named restart not working. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>and nothing on logs. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>What seems to be the problem, is it because the bind version is too outdated?<o:p></o:p></p><p class=MsoNormal>PS: sometimes this happens when our upstream is down, many unanswered DNS request sometimes trigger named not responding. <o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><i><span style='color:#1F497D'>Best Regards,</span></i><i><span style='font-size:12.0pt;color:#1F497D'><o:p></o:p></span></i></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Arie Lendra Putra </span><span style='font-size:12.0pt;color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial Unicode MS","sans-serif";color:#1F497D'>³ÂάÎÄ</span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><img width=58 height=58 id="Picture_x0020_1" src="cid:image001.png@01CE77D0.68A80DB0" alt="Description: Calligraphy"><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;color:#7F7F7F'>----------------------<o:p></o:p></span></p><p class=MsoNormal><i><u><span style='font-size:8.0pt;color:#1F497D'>Together</span></u></i><i><span style='font-size:8.0pt;color:#1F497D'> is a beautiful word,<o:p></o:p></span></i></p><p class=MsoNormal><i><span style='font-size:8.0pt;color:#1F497D'>Coming together is the Beginning, Keeping together is Progress<o:p></o:p></span></i></p><p class=MsoNormal><i><span style='font-size:8.0pt;color:#1F497D'>Thinking together is Unity, Working together is Success</span></i><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>