[DRBD-user] Drbd hang on write

Claude Pelletier CPelletier at serti.com
Mon Jul 31 16:20:06 CEST 2006

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Hi All,

We had a few discussion about this issu.

With all the exchange on the subject.
I think I can say I understand how drbd work on a high latency network.

Just to make sure I really understand.

So since I'm working with a high latency network
I have decided to use protocol A

Now this protocol work with 2 must.
1) the data have to be written on the primary machine disk
2) the data must be write in the tcp/ip buffer.

So the problem I get is when I copy large file (350MB and more) on the 
machine the drbd partition seems to stop accepting writing on his primary 
until the network start emptying the tcp/ip buffer. Cause with this large 
file copy
over the 10mb line just seems to be to slow to avoid drbd to stop 
the writing on the primary partition.

So with this said my question is :

I went on to the drbd web page from linbit to read about DRBD+

I was wondering if I would work with this version(intead of the free 
version) if I would get some improvment.
I see on the webpage a few of the features that are optimize to get better 

So if I would go with the not free version of drbd (DRBD+) could I expect 
to improve my situation or
it's not worth

Thanks !

Claude Pelletier
Serti Informatique Inc.
Courriel/Email : cpelletier at serti.com
Téléphone/Phone : (514) 493-1909
Télécopieur/Fax : (514) 493-3575
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