[DRBD-user] Removing DRBD Kernel Module Blocks

[Andrew Martin]

Hello, 


I am using DRBD (8.3.7) on 2 Ubuntu 10.04 amd64 virtual machines. I have configured 2 DRBD devices, /dev/drbd0 and /dev/drbd1 as follows: 

global { usage-count no; } 
common { 
syncer { rate 1000M; } 
} 
resource r0 { 
protocol C; 
startup { 
wfc-timeout 15; 
degr-wfc-timeout 60; 
} 
net { 
after-sb-0pri discard-zero-changes; 
after-sb-1pri discard-secondary; 
after-sb-2pri disconnect; 
cram-hmac-alg md5; 
shared-secret "thesecretpassword"; 
} 
on node1 { 
device /dev/drbd0; 
disk /dev/vdb1; 
address 192.168.1.10:7788; 
meta-disk internal; 
} 
on node2 { 
device /dev/drbd0; 
disk /dev/vdb1; 
address 192.168.1.11:7788; 
meta-disk internal; 
} 
} 
resource r1 { 
protocol C; 
startup { 
wfc-timeout 15; 
degr-wfc-timeout 60; 
} 
net { 
after-sb-0pri discard-zero-changes; 
after-sb-1pri discard-secondary; 
after-sb-2pri disconnect; 
cram-hmac-alg md5; 
shared-secret "thesecretpassword"; 
} 
on node1 { 
device /dev/drbd1; 
disk /dev/vdc1; 
address 192.168.1.10:7789; 
meta-disk internal; 
} 
on node2 { 
device /dev/drbd1; 
disk /dev/vdc1; 
address 192.168.1.11:7789; 
meta-disk internal; 
} 
} 


Shutting these VMs down gracefully takes over 30 minutes as the "rmmod drbd" command in /etc/rc0.d/K08drbd blocks. Moreover, it seems that access to any information related to the kernel modules blocks as well (e.g. "lsmod", accesses to /proc/modules, etc). Do you have any ideas on what is causing the removal of this module to block and how to resolve it? 


Thanks, 


Andrew 
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