[DRBD-user] drbd write performance across WAN

Luciano Miguel Ferreira Rocha strange at nsk.no-ip.org
Wed Aug 16 17:53:04 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.

On Wed, Aug 16, 2006 at 08:20:46AM -0700, khaja mohideen wrote:
> Hi,
>    I am using drbd 0.7.20 in debian 3.1.  I have setup
> drbd in such that Primary Server(host A) is located in
> our office.  Secondary Server(host B) i.e., that the
> backup is located in remote office.  It's connected
> via VPN.  
>    The write performance is heavily degraded.  I have
> used Protocol A  & sndbuf-size 512k . Still the same
> results. am I missing anything.  Pls advice/guide me
> to tweak the write performance.

Write performance will always be limited by network performance.
Protocol A will only give an advantage if you have short write bursts.
Otherwise, your system's memory will get full very fast.

>    Also can drbd support a single backup/mirror server
> for multiple primary servers.  i.e.,  Multiple
> Partitions from multiple servers(host1, host2) need to
> replicate to mulitiple paritions on a single secondary
> server(Host B).

Yes, the peers are defined for each resource. You're not limited to the
same one.


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