sles11sp1 system freeze (cpu mem disk all idle)
We have 600 suse servers, and there are system freeze occured some times, just 1 or 2 servers freeze at a time.
When the server freeze, I can not ssh to it , and can not login using monitor(all is freeze) Then, I create a screen session for every server. When I found a server freeze, I opened the screen session, then found some times I can run command in the session. command such as 'vmstat', 'uptime', 'iostat' ,'cat', 'ls' usually can run, but very little time hang. top command may hang some times. if I use pipe, the the session will hang 100%. I have check cpu , mem , disk io, also the file in /proc/sys/fs/ such as file-nr, but they were all idle . So I think there maybe a io lock occured in the kernel, but I can not find it |
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