配置drbd過程出現Primary/Unknown 故障，最後通過如下方式解決。
1， 節點狀態查看
(1) 主節點狀態
[root@app1 drbd.d]# cat /proc/drbd
version: 8.4.3 (api:1/proto:86-101)
GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by gardner@, 2013-11-29 12:28:00
0: cs:StandAlone ro:Primary/Unknown ds:UpToDate/DUnknown r-----
ns:0 nr:0 dw:0 dr:672 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:d oos:604
[root@app1 drbd.d]#
(2) 從節點狀態
[root@app2 ~]# cat /proc/drbd
version: 8.4.3 (api:1/proto:86-101)
GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by gardner@, 2013-11-29 12:28:00
0: cs:StandAlone ro:Secondary/Unknown ds:UpToDate/DUnknown r-----
ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:d oos:548
[root@app2 ~]#
2. 這裏確認以主節點的數據爲準，重新同步到從節點
(1) 停止app2 drbd服務
[root@app2 ~]# service drbd stop
Stopping all DRBD resources: .
[root@app2 ~]#
(2) 重新初始化元數據
[root@app2 ~]# drbdadm create-md data #create-md後面的是drbd資源的名稱
You want me to create a v08 style flexible-size internal meta data block.
There appears to be a v08 flexible-size internal meta data block
already in place on /dev/sdb1 at byte offset 5364318208
Do you really want to overwrite the existing v08 meta-data?
[need to type 'yes' to confirm] yes
Writing meta data...
md_offset 5364318208
al_offset 5364285440
bm_offset 5364121600
Found ext3 filesystem
5238400 kB data area apparently used
5238400 kB left usable by current configuration
Even though it looks like this would place the new meta data intounused space, you still need to confirm, as this is only a guess.
Do you want to proceed?[need to type 'yes' to confirm] yes
initializing activity log
NOT initializing bitmap
lk_bdev_save(/var/lib/drbd/drbd-minor-0.lkbd) failed: No such file or directory
New drbd meta data block successfully created.
lk_bdev_save(/var/lib/drbd/drbd-minor-0.lkbd) failed: No such file or directory
(3) 啓動drbd服務
[root@app2 ~]# service drbd start
Starting DRBD resources: [
create res: data
prepare disk: data
adjust disk: data
adjust net: data
]
..........
***************************************************************
DRBD's startup script waits for the peer node(s) to appear.
- In case this node was already a degraded cluster before the
reboot the timeout is 0 seconds. [degr-wfc-timeout]
- If the peer was available before the reboot the timeout will
expire after 0 seconds. [wfc-timeout]
(These values are for resource 'data'; 0 sec -> wait forever)
To abort waiting enter 'yes' [ 15]:yes
.
[root@app2 ~]# cat /proc/drbd
version: 8.4.3 (api:1/proto:86-101)
GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by gardner@, 2013-11-29 12:28:00
0: cs:Connected ro:Secondary/Primary ds:UpToDate/UpToDate C r-----
ns:0 nr:5238400 dw:5238400 dr:0 al:0 bm:320 lo:0 pe:0 ua:0 ap:0 ep:1 wo:d oos:0
[root@app2 ~]#
3. app1主節點下
(1) 主節點狀態正常了
[root@app1 ~]# cat /proc/drbd
version: 8.4.3 (api:1/proto:86-101)
GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by gardner@, 2013-11-29 12:28:00
0: cs:StandAlone ro:Primary/Unknown ds:UpToDate/DUnknown r-----
ns:0 nr:0 dw:0 dr:672 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:d oos:604
(2) 重啓drbd之後，數據重新同步到從節點
[root@app1 ~]# service drbd reload
Reloading DRBD configuration: .
[root@app1 ~]# cat /proc/drbd
version: 8.4.3 (api:1/proto:86-101)
GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by gardner@, 2013-11-29 12:28:00
0: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r---n-
ns:176816 nr:0 dw:0 dr:180896 al:0 bm:10 lo:4 pe:2 ua:8 ap:0 ep:1 wo:d oos:5063296
[>....................] sync'ed: 3.4% (4944/5112)M
finish: 0:00:57 speed: 87,552 (87,552) K/sec
[root@app1 ~]# cat /proc/drbd
version: 8.4.3 (api:1/proto:86-101)
GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by gardner@, 2013-11-29 12:28:00
0: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r---n-
ns:3541004 nr:0 dw:0 dr:3545760 al:0 bm:215 lo:2 pe:4 ua:6 ap:0 ep:1 wo:d oos:1700480
[============>.......] sync'ed: 67.6% (1660/5112)M
finish: 0:00:23 speed: 71,780 (69,368) K/sec
[root@app1 ~]# cat /proc/drbd
version: 8.4.3 (api:1/proto:86-101)
GIT-hash: 89a294209144b68adb3ee85a73221f964d3ee515 build by gardner@, 2013-11-29 12:28:00
0: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r-----
ns:5238400 nr:0 dw:0 dr:5239072 al:0 bm:320 lo:0 pe:0 ua:0 ap:0 ep:1 wo:d oos:0
再看一下節點狀態就同步了！這樣就解決了腦裂情況。且保證數據都還在。
學習DRBD+Heartbeat+NFS高可用的可以點擊此鏈接：http://blog.csdn.net/kjsayn/article/details/52871835