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[tips] drbd on OpenSuSE 13.2

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netman:
some tips:

* load module: modprobe drbd
* make a link first: ln -s /sbin/drbdadm /usr/sbin/drbdadm
* there is a warning about drbd-kmp when using Yast, just keep press Ok or Next
* use device name as /dev/drbd_XXX minor XXX (the _ must be presented)
* manually run drbdadm create-md <RES>
* manually run drbdadm up <RES>
* manually run drbdadm -- --overwrite-data-of-peer primay <RES> on 1st node, and drbdadm secondary <RES> on 2nd node
* check status by cat /proc/drbd, to make sure connected and Primary/Secondary on 1st node and Secondary/Primary on 2nd node

Some Errors:
* unknown minor
    - run drbdadm up <RES>

* no resources defined!
   - use Yast to create resource

* ds:Diskless/UpToDate in /proc/drbd
  - drbdadm down <RES>; drbdadm up <RES>

* (104) Can not open backing device
  - delect and re-create partition, ( may needs a reboot)

* staying cs:StandAlone in /proc/drbd on 2nd node
 - drbdadm -- --discard-my-data connect <RES>

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