[DRBD-user] dedicated network connection

Philip Gaw pgaw at darktech.org.uk
Wed Nov 28 21:33:29 CET 2012

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

On 28/11/2012 20:08, Mark Deneen wrote:
> I'd just like to note that we've had some trouble with certain NICs in 
> which the adapter resets itself.  In this situation, funny things can 
> happen with DRBD depending on how you are set up.  A switch in the 
> middle keeps the link active on both nodes and can be used to prevent 
> such a situation.
Have seen this myself on some HP kit (cant remember if it was broadcom 
onboard or intel add-in pci-e cards that displayed the issues though)

I make almost exclusive use of Intel ET2 quad gigabit cards in my new 
SAN (+iSCSI) + network stack and they have proven to be stable, fast and 

know of others using Intel I340-T2 with no issue :-)


> With that being said, which NICs are you guys using in your setups? 
>  Are you happy with them?
> -M
> On Mon, Nov 26, 2012 at 12:04 PM, Lionel Sausin <ls at numerigraphe.com 
> <mailto:ls at numerigraphe.com>> wrote:
>     Direct back-to-back means a dedicated pair of NICs and a single
>     cable between them - this  optimizes latency which DRBD is
>     sensitive to.
>     DRBD is known to work on lesser configurations too, with varying
>     performance impacts.
>     The IP network should not matter as far as I know.
>     Lionel Sausin
>     Le 25/11/2012 20:46, marcus a écrit :
>>     Hello
>>     Thank you for making this product available!
>>     In your documentation you say:
>>     "It is recommended that you run your DRBD replication over a
>>     "dedicated connection", preferably  a "direct, back-to-back,
>>     Gigabit Ethernet connection."
>>     Does this mean a second NIC (in each host) on the same subnet,
>>     a second NIC (in each host) on a different, separate switch and
>>     subnet,
>>     or a second NIC (in each host) and a configured cross-over cable??
>>     I am configuring 2 servers on a small network.  One as primary
>>     and the second as a hot standby.  I want to use DRBD to
>>     replicate  the data partition.
>>     thanks in advance
>>     Marcus
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