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<DIV><FONT size=2 face=Verdana>Hi,</FONT></DIV>
<DIV> </DIV>
<DIV style="TEXT-INDENT: 2em">We got a problem that the MDS has high load
value and the system CPU is up to 60% when running chown command on client. It's
strange that the load value and system CPU didn't decrease to the normal level
as long as it getted high. Even we can't do anything on clients and OSS.
You can see the information with top command as follows:</DIV>
<DIV style="TEXT-INDENT: 2em">
<DIV></DIV>
<DIV>
<DIV>[root@mainmds ~]# top</DIV>
<DIV>top - 10:19:02 up 1:03, 3 users, load average: 28.73, 27.10, 23.88</DIV>
<DIV>Tasks: 515 total, 44 running, 471 sleeping, 0 stopped, 0 zombie</DIV>
<DIV>Cpu0 : 0.0%us, 84.1%sy, 0.0%ni, 15.9%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Cpu1 : 0.0%us,100.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Cpu2 : 0.0%us, 72.5%sy, 0.0%ni, 27.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Cpu3 : 0.0%us, 83.5%sy, 0.0%ni, 16.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Cpu4 : 0.0%us, 78.4%sy, 0.0%ni, 21.6%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Cpu5 : 0.0%us, 82.9%sy, 0.0%ni, 17.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Cpu6 : 0.0%us, 69.2%sy, 0.0%ni, 30.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Cpu7 : 0.0%us, 79.6%sy, 0.0%ni, 20.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Cpu8 : 0.0%us, 77.2%sy, 0.0%ni, 22.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Cpu9 : 0.0%us, 58.9%sy, 0.0%ni, 41.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Cpu10 : 0.0%us, 84.4%sy, 0.0%ni, 15.6%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Cpu11 : 0.0%us, 97.6%sy, 0.0%ni, 2.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Cpu12 : 0.0%us, 81.4%sy, 0.0%ni, 18.6%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Cpu13 : 0.0%us, 85.0%sy, 0.0%ni, 15.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Cpu14 : 0.0%us, 88.0%sy, 0.0%ni, 12.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Cpu15 : 0.0%us, 36.3%sy, 0.0%ni, 63.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st</DIV>
<DIV>Mem: 24682716k total, 2985412k used, 21697304k free, 268360k buffers</DIV>
<DIV>Swap: 24579440k total, 0k used, 24579440k free, 368904k cached</DIV>
<DIV>
<DIV> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND </DIV>
<DIV> 5449 root 16 0 0 0 0 R 100.2 0.0 52:46.12 ptlrpcd </DIV>
<DIV> 5434 root 16 0 0 0 0 R 89.0 0.0 34:15.77 socknal_sd07 </DIV>
<DIV> 5432 root 16 0 0 0 0 R 88.3 0.0 32:43.12 socknal_sd05 </DIV>
<DIV> 5430 root 16 0 0 0 0 R 79.1 0.0 30:37.78 socknal_sd03 </DIV>
<DIV> 5436 root 16 0 0 0 0 R 61.2 0.0 29:08.47 socknal_sd09 </DIV>
<DIV> 5440 root 16 0 0 0 0 S 59.5 0.0 33:31.32 socknal_sd13 </DIV>
<DIV> 5433 root 16 0 0 0 0 R 49.0 0.0 23:20.61 socknal_sd06 </DIV>
<DIV> 5431 root 15 0 0 0 0 R 45.0 0.0 26:04.43 socknal_sd04 </DIV>
<DIV> 5427 root 15 0 0 0 0 S 44.7 0.0 23:31.11 socknal_sd00 </DIV>
<DIV> 5435 root 15 0 0 0 0 S 44.3 0.0 24:50.30 socknal_sd08 </DIV>
<DIV> 5439 root 15 0 0 0 0 R 43.7 0.0 24:23.79 socknal_sd12 </DIV>
<DIV> 5437 root 15 0 0 0 0 R 39.7 0.0 27:11.58 socknal_sd10 </DIV>
<DIV> 5438 root 16 0 0 0 0 S 37.4 0.0 40:50.69 socknal_sd11 </DIV>
<DIV> 5441 root 15 0 0 0 0 S 35.4 0.0 26:35.59 socknal_sd14 </DIV></DIV>
<DIV> </DIV>
<DIV>According to the top information, we can see the proc ptlrpcd with 100%
CPU, it is not normal for the system, it likes the ptlrpcd become locked. So we
have to reboot the MDS to solve the proble now. We don't know about
the phenomena. Do someone get the problem or have some idea for it? I will be
appreciate for your any help.</DIV>
<DIV>Addition, we use the lustre 1.8.1.1 on MDS and OSS, lustre1.6.5 on clients.
</DIV>
<DIV> </DIV>
<DIV>Thanks advance for you.</DIV>
<DIV> </DIV>
<DIV>
<DIV>Cheers</DIV>
<DIV>Qiulan Huang</DIV>
<DIV>--------------------------------------------------------------
</DIV>
<DIV>Computing Center IHEP
Office: Computing Center,123 </DIV>
<DIV>19B Yuquan Road
Tel: (+86) 10 88236012-607</DIV>
<DIV>P.O. Box 918-7
Fax: (+86) 10 8823 6839</DIV>
<DIV>Beijing 100049,China
Email: <A href="mailto:huangql@ihep.ac.cn">huangql@ihep.ac.cn</A> </DIV>
<DIV>--------------------------------------------------------------
</DIV></DIV></DIV></DIV>
<DIV align=left><FONT color=#c0c0c0 size=2 face=Verdana>2010-03-01
</FONT></DIV><FONT size=2 face=Verdana>
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<DIV><FONT color=#c0c0c0 size=2 face=Verdana><SPAN>huangql</SPAN>
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