On 7/1/2016 4:30 PM, Kern Sibbald wrote:
> Hello,
>
> In general, the TCP/IP protocol that Bacula uses is extremely tolerant,
> and should retry sending packets quite a number of times before finally
> giving up. It is designed to tolerate a significant number of dropped
> packets. However, then there are two things that enter to screw this
> up: 1. network switches which do not follow internet rules at all (i.e.
> they are very fast to drop idle connections, even if you have explicitly
> set the network to survive idle periods as Bacula does); 2. Windows
> which does not seem to follow quite a few Internet rules. The two put
> together mean that especially with on Windows machines, network
> disruptions are annoyingly frequent.
In particular, the 802.3az standard (Energy Efficient Ethernet), or
rather the various implementation of it in both switches and NICs, is
what I believe to be a major cause of these dropped connections. One
thing to try on Windows machines is to disable 802.3az support by
setting "Network and Sharing Center > Change adapter settings >
Properties.> Power Management > Allow the computer to turn off this
device to save power" to disabled.
I have also had issues with Macbook Air and Macbook Pro laptops dropping
active TCP connections when changing to low power states, in that case I
think turning off their wireless transmitter even though bacula-fd has
an active TCP connection to bacula-sd. Anyone know how to disable the
overly aggressive power management for Macs?
> Bacula was designed with the concept that the Internet never loses
> packets and that it is highly tolerant -- given the above two problems,
> maybe this was a bad choice. However, the result of that decision is
> that if the line drops, Bacula has no idea what reached and what did not
> reach the other side, and so it is not currently possible for it to
> reconnect and resume where it left off.
>
> Best regards,
> Kern
>
> On 07/01/2016 03:43 PM, Josh Fisher wrote:
>> On 7/1/2016 1:26 AM, Craig Shiroma wrote:
>>> Hello All,
>>>
>>> Is there a way in Bacula to prevent something like a 1 or 2 second
>>> network glitch from cancelling Window Server backups? RHEL backups
>>> seem to survive these episodes with no problems.
>>>
>> Bacula expects DIR-to-FD and FD-to-SD TCP connections to persist for the
>> duration of a job. If either is dropped it will cause the job to cancel.
>> As a result, Bacula is not very tolerant of network problems. Since it
>> appears to be the Windows Server machines dropping the connection due to
>> the glitch, if there is a solution it will be in the Windows networking
>> config, possibly in the NIC's driver settings. Perhaps RHEL is more
>> tolerant of the glitch or perhaps it is a hardware difference in the
>> NICs. Nevertheless, in general such network glitches cause problems for
>> Bacula regardless of OS.
>>
>>
>>
>>> Respectfully,
>>> Craig
>>>
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>
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