[OpenAFS] Busy call channel when communicating with server ...

Michael Richter m.richter@tu-berlin.de
Wed, 5 Sep 2012 08:28:05 +0200

We tried several versions of 1.7 till 1.7.8 and had some issues 
(printing of smilie pages, Acrobat crashes, hang on shutdown/logout). So 
we went back to 1.6.1 for our XP machines. Actually we use 1.7.15 on our 
Vista/7 machines only (less than 20 PCs and notebooks).

So you mean we should try again?

schrieb Jeffrey Altman:
> An rx peer such as an AFS file service will return a RX_PACKET_TYPE_BUSY
> response to an RPC if the RPC was issued on a call channel which the
> file server believes is still in use.  The most frequent cause of this
> condition is when the client's idle dead timeout processing triggers
> because the file service accepted an RPC request and has replied with
> nothing but keep alive messages for the configured period of time.  It
> specific time depends on whether the volume the request was sent to is
> replicated or not.  In all cases, the idle dead timeout period will be
> longer than 60 seconds.
> As the event log message indicates, the client will automatically retry
> the request when this situation occurs.  However, the 1.6.1 client on
> Windows relies upon the SMB redirector and the SMB protocol has an RPC
> request timeout period of a bit more than 45 seconds.  If the SMB
> timeout period is reached without a response from the SMB server, (aka
> the AFS cache manager \\AFS), then the SMB client will terminate the
> connection and it too will begin its own process of attempting retries
> and finally reporting errors to the application.
> If client side idle dead timeouts are being triggered, it means that the
> file service is not responding to clients in a timely fashion and an
> effort should be expended to determine why.
> The OpenAFS 1.7.17 client does not rely on the SMB redirector.  It
> should be used on all Windows platforms as the AFS redirector does not
> impose an arbitrary 45 timeout period on file operations.
> Jeffrey Altman
> On 9/4/2012 2:45 AM, Michael Richter wrote:
>> Hi,
>> since a month we have infrequent problem on our workstations. The PCs
>> are getting unresponsive, programs are crashing, it's not usable. While
>> this happens OpenAFS posts messages like this in 5s-interval:
>> Type:    Warning
>> Source:    AFS Client
>> Event-ID:    4145
>> Eventtime:    03.09.2012 16:06:24
>> User:    n/z
>> Computer:    UBWSTMAPC185
>> Description:
>> Busy call channel when communicating with server,
>> retrying ...
>> This does not happen on all PCs. But all PCs use the same software:
>> Windows XP Prof SP3, OpenAFS 1.6.1
>> I asked our AFS server administrators but it seems that they don't know
>> what's wrong.
>> Does someone know what I can do to fix it?
>> Michael
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