[DRBD-user] Identifying High iowait on DRBD Computers

Matt Graham danceswithcrows at usa.net
Fri Feb 18 17:57:03 CET 2011

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


From: yvette hirth <yvette at dbtgroup.com>
> Matt Graham wrote:
>> Under Linux, a process in state D (waiting for a syscall to return)
>> *cannot* be killed, even with SIGKILL.  The kernel programmers found
>> a number of circumstances where terminating a process in state D
>> could lead to Undefined Behavior
> perhaps the kernel and/or filesystem drivers should be upgraded to 
> recognize when the userspace is abending / no longer present and cancel 
> all pending i/o for that userspace.

http://crow202.org/17 , look at the more detailed description in that
comp.os.linux.misc message, and figure out how to address all the concerns
there before continuing.

> this is what z/OS does.

Good for it.  Does z/OS do DRBD?  No?  Then this has gone a tiny bit
offtopic....

-- 
Matt G / Dances With Crows
The Crow202 Blog:  http://crow202.org/wordpress/
There is no Darkness in Eternity/But only Light too dim for us to see




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