[DRBD-user] drbd stuck in WFbitmaps state in WAN link

Brian R. Hellman brian at linbit.com
Mon Feb 20 17:20:04 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 02/18/2012 06:58 AM, papu bhattacharya wrote:
> Hi All,
> I have successfully setup a DRBD setup between two server in my lan
> setup. The speed is 100 Mbps.  The next staage was to do a DR setup
> with wan link. The WAN link speed is 2Mbps.  In wan link , i see the
> DRBD is stuck in WFBitmaps state. Whenever i change the link , it
> works fine, but in my wan L2 link , it is always stuck in WFBitmaps.
> As i search the different forums , i see that most potential reason
> could be the MTU size of the link. Does MTU size really matters? My
> wan link MTU size is 1500 default and it does not support zumbo frame.
> Is there any option that can make DRBD to work in 1500 MTU size.
> Thanks in advance.

Hi Papu,

Once you apply the use-rle as suggested, you may run into other
performance issues depending on the amount of traffic and latency.  If
you do, you may want to give DRBD Proxy a try since it was designed
specifically for this type of scenario.

Good luck with your setup,

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: Brian Hellman
: LINBIT | "Your Way to High Availability"
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