drbd (was nmbd)

Philipp Reisner kde at ist.org
Mon Nov 8 23:54:25 MST 1999

Am Mon, 08 Nov 1999 schriebst Du:
>In article <14373.47175.80544.454768 at dukat.scot.redhat.com>, Stephen C. Tweedie <sct at redhat.com> wrote:
>> On Sat, 6 Nov 1999 12:13:42 +0100, Philipp Reisner <kde at ist.org> said:
>>> If the failed node comes up again, it is a new secondary node and has
>>> to synchronise its content to the primary. This, of course, will happen
>>> whithout interruption of service in the background. 
>> This is the cluster partition problem, and it is one of the hardest
>> parts of HA.
>IBM solves it by letting the secondary site call the primary one via a
>dedicated independent phone line. Seems pretty straightforward, and needs
>to be provided by the HA software, not the network block device.
>I'd be interested how drbd handles the proper packet sequence, though. 

For now drbd uses only one TCP connection, thus the packets arrive
in order.

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