The configuration process for setting up a secondary node is the same as for the primary node, except that you do not have to create the file system on the secondary node device, as this information will automatically be transferred from the primary node.
To set up a secondary node:
/etc/drbd.conf file from your
primary node to your secondary node. It should already
contain all the information and configuration that you need,
since you had to specify the secondary node IP address and
other information for the primary node configuration.
Create the DRBD metadata on the underlying disk device:
root-shell> drbdadm create-md all
root-shell> /etc/init.d/drbd start
Once DRBD has started, it will start the copy the data from the primary node to the secondary node. Even with an empty file system this will take some time, since DRBD is copying the block information from a block device, not simply copying the file system data.
You can monitor the progress of the copy between the primary and
secondary nodes by viewing the output of
root-shell> cat /proc/drbd version: 8.0.4 (api:86/proto:86) SVN Revision: 2947 build by root@drbd-one, 2007-07-30 16:43:05 0: cs:SyncSource st:Primary/Secondary ds:UpToDate/Inconsistent C r--- ns:252284 nr:0 dw:0 dr:257280 al:0 bm:15 lo:0 pe:7 ua:157 ap:0 [==>.................] sync'ed: 12.3% (1845088/2097152)K finish: 0:06:06 speed: 4,972 (4,580) K/sec resync: used:1/31 hits:15901 misses:16 starving:0 dirty:0 changed:16 act_log: used:0/257 hits:0 misses:0 starving:0 dirty:0 changed:0
You can monitor the synchronization process by using the watch command to run the command at specific intervals:
root-shell> watch -n 10 'cat /proc/drbd'