'ls' hangs FC6

[Mark Haney]

Rick Stevens wrote:
> Paul Johnson wrote:
>> On Wed, Apr 9, 2008 at 1:26 PM, Mark Haney <mhaney at ercbroadband.org> 
>> wrote:
>>> Does anyone have any ideas on why 'ls' would suddenly stop working? 
>>> I've got
>>> a FC6 box that acts as a SAN host and for the last week or so I can't ls
>>> anything.  It sits and does nothing.  Everything else on the box 
>>> works just
>>> fine except for that.
>>>
>>>  I've got no idea how to even go about debugging this.
>>>
>>
>> I have seen this on systems that are using LDAP for authentication.
>> They don't just authenticate at start time, but they look up user
>> information every time.  Every single time any command is run, the
>> system goes off to check user identity on a server.  When there is
>> network slowdown or server slowdown, then ls is slow.  For us, the
>> short term fix was to install the nscd to cache the information so the
>> system does not constantly look on the server.  The long term fix was
>> to stop authenticating users with LDAP.
> 
> Or run "ls -ln" so you don't do user/group lookups and simply display
> the numbers.
> 
It must be something with the user/group lookups then because an ls-ln 
works just fine. I just can't figure out /why/ it's a problem now.



> I think you said this stuff was on a SAN.  Have you verified that the
> SAN isn't causing problems?  We had that issue on a cluster running old
> LSI Logic drivers.  The SAN was getting freaked out because of command
> overruns.
> ----------------------------------------------------------------------
> - Rick Stevens, Systems Engineer                       rps2 at nerd.com -
> - Hosting Consulting, Inc.                                           -
> -                                                                    -
> -             To iterate is human, to recurse, divine.               -
> ----------------------------------------------------------------------
> 


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Mark Haney
Sr. Systems Administrator
ERC Broadband
(828) 350-2415

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