[OpenAFS] File creation delays

John W. Sopko Jr. sopko@cs.unc.edu
Wed, 17 Mar 2010 09:12:35 -0400

I caught this during a "rmdir filename" delay, doesn't look like
much help:

% cmdebug lark.cs.unc.edu
** Cache entry @ 0x8dbb3140 for 205.536884167.1.1 [cs.unc.edu]
     locks: (none_waiting, write_locked(pid:12024 at:154))
            43008 bytes  DV       334718  refcnt     2
     callback a2162540   expires 1268845260
     0 opens     0 writers
     volume root
     states (0x1), stat'd

John W. Sopko Jr. wrote, On 3/17/2010 8:32 AM:
> Derrick Brashear wrote, On 3/17/2010 8:06 AM:
>> On Wed, Mar 17, 2010 at 8:03 AM, John W. Sopko Jr.<sopko@cs.unc.edu>
>> wrote:
>>> We are having intermittent file creation delays. For example if you make
>>> a directory or vim a file and close the file, it takes 15 seconds or so
>>> to create the file. The problems seems to be getting worse. The problem
>>> goes away and then come back, I have seen this problem on and off
>>> over the
>>> last year or so.
>> cmdebug the client in question and see where it's blocking.
> Never used cmdebug before, read the man page, tried all the options
> and they seem to work and do not hang. Do not know what I
> am looking for.
>> Anything at the syscall level probably tells us nothing.

John W. Sopko Jr.               University of North Carolina
email: sopko AT cs.unc.edu      Computer Science Dept., CB 3175
Phone: 919-962-1844             Fred Brooks Building; Room 140
Fax:   919-962-1799             Chapel Hill, NC 27599-3175