[CentOS] RAID level and killing a job
Scott R. Ehrlich
scott at MIT.EDU
Tue Jan 13 19:22:30 UTC 2009
On Tue, 13 Jan 2009, William L. Maltby wrote:
> On Tue, 2009-01-13 at 10:04 -0800, nate wrote:
>>> Second question - A newly installed server consisting of CentOS 5.2,
>>> off the DVD, I invoke a command by hand, realize I want to kill it soon
>>> (logged in as root). I issue ps auwx|grep name_of_command, get the PID, and
>>> issue kill -9 PID. ps auwx|grep name_of_command is still running.
>>> The command is NOT part of any scheduled job. Why won't the process die?
>> Is the process state "D" or "Z" ? Frequently either of these states
>> can trigger an unkillable process. Sometimes "Z" (zombies) can be
>> killed but often times they can't be directly killed. And if the
>> process is in "D" then it is stuck waiting for I/O(most often) and
>> you have to wait for it to complete, or reboot, sometimes going to
>> single user mode and back again works as well, and sometimes killing
>> other processes that the stuck one depends on can sometimes free it
>> up so it can die.
I discovered, by chance, the Xen kernel was getting in the way. I booted
to the non-Xen kernel and all is well.
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