7.3.3. Initialize and Load DRBD
With the configuration in place, we can now perform the DRBD initialization
# drbdadm create-md wwwdata
Writing meta data...
initializing activity log
NOT initialized bitmap
New drbd meta data block successfully created.
success
Now load the DRBD kernel module and confirm that everything is sane
# modprobe drbd
# drbdadm up wwwdata
# cat /proc/drbd
version: 8.3.11 (api:88/proto:86-96)
srcversion: 0D2B62DEDB020A425130935
1: cs:Connected ro:Secondary/Secondary ds:Inconsistent/Inconsistent C r-----
ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:1015740
Repeat on the second node
# ssh pcmk-2 -- drbdadm --force create-md wwwdata
Writing meta data...
initializing activity log
NOT initialized bitmap
New drbd meta data block successfully created.
success
# ssh pcmk-2 -- modprobe drbd
WARNING: Deprecated config file /etc/modprobe.conf, all config files belong into /etc/modprobe.d/.
# ssh pcmk-2 -- drbdadm up wwwdata
# ssh pcmk-2 -- cat /proc/drbd
version: 8.3.11 (api:88/proto:86-96)
srcversion: 0D2B62DEDB020A425130935
1: cs:Connected ro:Secondary/Secondary ds:Inconsistent/Inconsistent C r-----
ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:1015740
Now we need to tell DRBD which set of data to use. Since both sides contain garbage, we can run the following on pcmk-1:
# drbdadm -- --overwrite-data-of-peer primary wwwdata
# cat /proc/drbd
version: 8.3.11 (api:88/proto:86-96)
srcversion: 0D2B62DEDB020A425130935
1: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r-----
ns:8064 nr:0 dw:0 dr:8728 al:0 bm:0 lo:0 pe:1 ua:0 ap:0 ep:1 wo:f oos:1007804
[>....................] sync'ed: 0.9% (1007804/1015740)K
finish: 0:12:35 speed: 1,320 (1,320) K/sec
After a while, the sync should finish and you’ll see:
# cat /proc/drbd
version: 8.3.11 (api:88/proto:86-96)
srcversion: 0D2B62DEDB020A425130935
1: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r-----
ns:1015740 nr:0 dw:0 dr:1016404 al:0 bm:62 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:0
pcmk-1 is now in the Primary state which allows it to be written to. Which means it’s a good point at which to create a filesystem and populate it with some data to serve up via our WebSite resource.
