On 3/3/2011 9:56 AM, Josh Fisher wrote:
>
> On 3/3/2011 4:16 AM, Matthew Ife wrote:
>>> From my experience this is almost entirely a Windows FD problem. Windows
>>> networking seems to be more influenced by external pressure more. It is
>>> particularly acute when the network is congested or unreliable (say a
>>> switch dropping packets) when the backplane gets full.
>>
>> So it wouldn't surprise me you get this over wireless.
>>
>> I've never been able to make a reliable test-case for it to ever properly
>> diagnose the issue.
>
> I'm convinced many of the Windows connectivity problems are due to
> aggressive power management, particularly for laptops. Windows seems to
> want to shut down wireless NICs every chance it gets. That's
> understandable, given that it does save considerable power. Most
> protocols, such as HTTP, SMTP, etc., generally are short lived and used
> by interactive aps where keyboard/mouse activity is preventing pm
> shutdown. So, as an apparent design choice, NIC activity does not reset
> pm timers. Also understandable. As a result, Microsoft provided the
> SetThreadExecutionState() system function so that a daemon can tell pm
> that it is indeed actively using pm controlled resources and that pm
> should not shut them down just yet. I believe there is work underway to
> add the necessary calls to the Windows fd, and that may well alleviate
> much of the Windows connectivity problems.
>
Speaking of this windows-fd work, if somebody official would kindly build
the current windows-fd beta I'd be happy to test it on up to 100 computers
I have here at my disposal...
Bob
>> -----Original Message-----
>> From: Kern Sibbald [mailto:k...@sibbald.com]
>> Sent: 03 March 2011 06:07
>> To: bacula-devel@lists.sourceforge.net
>> Cc: Dan Langille
>> Subject: Re: [Bacula-devel] overly sensitive FD->SD comms
>>
>> On Thursday 03 March 2011 03:05:21 Dan Langille wrote:
>>> Tonight I was doing a backup of my laptop over its wireless connection.
>>> The connection blipped. The backup failed. My ssh session continued.
>>> Mind you, there was no traffic going over the ssh session at the time.
>>> FYI: my laptop has a static IP.
>>>
>>> Why is Bacula comms more sensitive than SSH comms?
>> Bacula was transmitting data in one direction or the other and ssh was not.
>> That is the only explanation.
>>
>>> I know this comes up
>>> from time to time amongst users, but I had no idea it was so sensitive.
>>> Is this something difficult to achieve? I know I don't have the
>>> expertise in comms.
>> If the comm line breaks while during a transmission whether it is ssh or
>> Bacula, the connection will be dropped -- unless ssh has special code to
>> either ignore errors or re-establish a connect, which from what I have seen
>> of ssh code is not the case.
>>
>> Regards,
>>
>> Kern
>>
>>> Here are some lines from the job output
>>>
>>> 03-Mar 01:55 laptop-fd JobId 54312: Error:
>>> /home/kern/bacula/k/bacula/src/lib/bsock.c:393 Write error sending 65536
>>> bytes to Storage daemon:kraken.example.org:9103: ERR=Input/output error
>>>
>>> 03-Mar 01:55 laptop-fd JobId 54312: Fatal error:
>>> /home/kern/bacula/k/bacula/src/filed/backup.c:1024 Network send error to
>>> SD. ERR=Input/output error
>>>
>>> 03-Mar 01:56 laptop-fd JobId 54312: Error:
>>> /home/kern/bacula/k/bacula/src/lib/bsock.c:339 Socket has errors=1 on
>>> call to Storage daemon:kraken.example.org:9103
>>
>>
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