[DRBD-user] Inconsistent filesystem if mounting drbd-Partition on the backup heartbeat-system

Volker Dose vpdose at kirchenweg.de
Thu Jan 4 16:05:29 CET 2007


Hi all,

i have a very strange problem with my linux-cluster. I have two dell servers
with a shared drbd-partition for the data. The connection state on both
systems seems to be fine,  if you can  trust /proc/drbd:

default:~ # cat /proc/drbd
version: 0.7.14 (api:77/proto:74)
SVN Revision: 1990 build by root at girgendwas, 2006-05-18 03:03:57
 0: cs:Connected st:Primary/Secondary ld:Consistent
    ns:928491536 nr:148 dw:907947060 dr:35596009 al:42515 bm:2803 lo:0 pe:0
ua:0 ap:0
default:~ #

and on the other side:

backup:~ # cat /proc/drbd
version: 0.7.14 (api:77/proto:74)
SVN Revision: 1990 build by root at girgendwas, 2006-05-18 03:03:57
 0: cs:Connected st:Secondary/Primary ld:Consistent
    ns:148 nr:928498956 dw:939440840 dr:80299 al:29 bm:7584 lo:0 pe:0 ua:0
ap:0
backup:~ #

When I force the system to change roles and the backup-system is mounting
the datadisk-partition, at first everythings seems to be okay, no error
messages.

But if I take a look at the files on that partition, there are very strange
effects. Filenames aren't correct and I get I/O-error if I try to access
directories

backup:~ # ls /datadisk/ 
.  
..  
a2chive  
i.coming  
quarantine  
spama3sassin

Can you see the dot in "incoming"? I get errors while trying to access that
directory:

backup:~ # l /datadisk/
/bin/ls: /datadisk/MailScanner/i.coming: Input/output error
/bin/ls: /datadisk/MailScanner/quarantine: Input/output error total 16
drwxr-xr-x   6 root    root    4096 Dec  6  2005 ./
drwxr-xr-x  22 root    root    4096 Sep 25 18:49 ../
?rwxrwx---   2 postfix www     4096 Jan 27  2006 a2chive
drwxr-xr-x   2 postfix postfix 4096 Oct 24  2005 spama3sassin/
backup:~ #


Has anybody seen such an effect before? I have several other clusters with
the same hardware and this never happened before. 

With kind regards,

Volker Dose 





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