Theoretically, the most recent versions Bacula (the Bacula Enterprise
versions) disables any Windows suspend during a backup, but I have never
actually tried it, and I am not sure if it disables the power saving
modes though.
If you figure out how to shut off such Bacula unfriendly stuff on a Mac
please let me know.
Best regards,
Kern
On 07/02/2016 01:13 PM, Josh Fisher wrote:
> 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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