[DRBD-user] Problem with stacked resource failing

Kaloyan Kovachev kkovachev at varna.net
Sat Mar 3 12:37:16 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 Fri, 2 Mar 2012 18:55:22 -0800 (PST), envisionrx
<ron.wells at envision-rx.com> wrote:
> Brian R. Hellman wrote:
>> This may be a situation where DRBD Proxy would help, however we'd need
>> bit more information to determine that.  
>> Do the logs on the DR side say anything with regards to DRBD at all?  
>> The logs have normal drbd info, but i don't see anything on the DR side
>> indicating an error condition.
>> What is the latency between the sites? 
>> The ping time between sites is typically around 60 ms, is that what
>> asking, or is there some other measurement you're looking for?
>> Are you able to trigger this, or do you see a pattern of when it
>> Well, interestingly, we decided to try to configure an ipsec tunnel
>> between the sites, we've been using an openvpn tunnel.  We're having
>> trouble getting the ipsec tunnel to work.  When we are working with the
>> ipsec tunnel we have a very strange situation where the tunnel shows as
>> being up, we can ping through the tunnel, ssh through the tunnel, but
>> we try to pass any significant amount of traffic through the tunnel it
>> flakes out.  For example if we try to scp through the tunnel it starts
>> and
>> then stalls.  If we try to sync drbd through the tunnel we see this
>> sock_sendmsg time expired failure situation all the time.  So at this
>> point if we use the ipsec tunnel we can duplicate it consistently.

This looks like MTU problem. Try to ping with different packet sizes to
determine the link MTU and adjust accordingly.

>> -- 
>> : Brian Hellman
>> : LINBIT | "Your Way to High Availability"
>> : 1-877-4-LINBIT
>> : Web: http://www.linbit.com
>> :
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