oracle 裸设备 ocr,裸设备建立RAC的OCR设备不一致的问题
如果使用裸設備建立RAC環境，各個節點的OCR設置對應的物理設備名稱可能是不一致的。
對于ASM磁盤組而言，三個節點上裸設備的物理名稱不一致沒有問題。比如在這個RAC環境中：
bash-2.03$ sqlplus / as sysdba
SQL*Plus: Release 10.2.0.3.0 - Production on星期四11月26 17:22:16 2009
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
連接到:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP and Data Mining options
SQL> set pages 100 lines 120
SQL> select inst_id, instance_name, host_name
2 from gv$instance;
INST_ID INSTANCE_NAME HOST_NAME
---------- ---------------- ----------------------------------------------------------------
1 testrac1 racnode1
3 testrac3 racnode3
2 testrac2 racnode2
SQL> exit從Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP and Data Mining options斷開
其中ASM1實例對應的磁盤信息為：
bash-2.03$ hostname
racnode1
bash-2.03$ export ORACLE_SID=+ASM1
bash-2.03$ sqlplus / as sysdba
SQL*Plus: Release 10.2.0.3.0 - Production on星期四11月26 17:24:03 2009
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
連接到:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP and Data Mining options
SQL> set pages 100 lines 120
SQL> col name format a10
SQL> col path format a40
SQL> select group_number, name, state, total_mb
2 from v$asm_diskgroup;
GROUP_NUMBER NAME STATE TOTAL_MB
------------ ------------------------------ ---------------------- ----------
1 DISK MOUNTED 385186
SQL> select disk_number, name, path, total_mb
2 from v$asm_disk
3 where group_number = 1
4 order by 1;
DISK_NUMBER NAME PATH TOTAL_MB
----------- ---------- ---------------------------------------- ----------
0 DISK_0000 /dev/rdsk/c2t1d0s1 128
1 DISK_0001 /dev/rdsk/c2t1d0s6 24318
2 DISK_0002 /dev/rdsk/c2t1d1s1 4096
3 DISK_0003 /dev/rdsk/c2t1d1s3 4096
4 DISK_0004 /dev/rdsk/c2t1d1s4 4096
5 DISK_0005 /dev/rdsk/c2t1d1s5 4096
6 DISK_0006 /dev/rdsk/c2t1d1s6 4092
7 DISK_0007 /dev/rdsk/c2t1d2s4 1024
8 DISK_0008 /dev/rdsk/c2t1d2s5 1024
9 DISK_0009 /dev/rdsk/c2t1d2s6 1023
10 DISK_0010 /dev/rdsk/c2t1d3s1 1024
11 DISK_0011 /dev/rdsk/c2t1d3s3 1024
12 DISK_0012 /dev/rdsk/c2t1d3s4 1024
13 DISK_0013 /dev/rdsk/c2t1d3s5 1024
14 DISK_0014 /dev/rdsk/c2t1d3s6 989
15 DISK_0015 /dev/rdsk/c2t1d4s1 1024
16 DISK_0016 /dev/rdsk/c2t1d4s3 1024
17 DISK_0017 /dev/rdsk/c2t1d4s4 1024
18 DISK_0018 /dev/rdsk/c2t1d4s5 1024
19 DISK_0019 /dev/rdsk/c2t1d4s6 1023
20 DISK_0020 /dev/rdsk/c2t1d5s1 100
21 DISK_0021 /dev/rdsk/c2t1d5s3 100
22 DISK_0022 /dev/rdsk/c2t1d5s4 100
23 DISK_0023 /dev/rdsk/c2t1d5s5 100
24 DISK_0024 /dev/rdsk/c2t1d5s6 100
25 DISK_0025 /dev/rdsk/c2t1d5s7 99
26 DISK_0026 /dev/rdsk/c2t1d6s1 100
27 DISK_0027 /dev/rdsk/c2t1d6s3 100
28 DISK_0028 /dev/rdsk/c2t1d6s4 100
29 DISK_0029 /dev/rdsk/c2t1d6s5 100
30 DISK_0030 /dev/rdsk/c2t1d6s6 100
31 DISK_0031 /dev/rdsk/c2t1d6s7 99
32 DISK_0032 /dev/rdsk/c2t1d7s1 100
33 DISK_0033 /dev/rdsk/c2t1d7s3 100
34 DISK_0034 /dev/rdsk/c2t1d7s4 100
35 DISK_0035 /dev/rdsk/c2t1d7s5 100
36 DISK_0036 /dev/rdsk/c2t1d7s6 100
37 DISK_0037 /dev/rdsk/c2t1d7s7 99
38 DISK_0038 /dev/rdsk/c2t1d8s6 50940
39 DISK_0039 /dev/rdsk/c2t1d13s6 274252
已選擇40行。
而ASM2實例對應的磁盤信息為：
bash-2.03$ hostname
racnode2
bash-2.03$ export ORACLE_SID=+ASM2
bash-2.03$ sqlplus / as sysdba
SQL*Plus: Release 10.2.0.3.0 - Production on星期四11月26 17:18:59 2009
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
連接到:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP and Data Mining options
SQL> set pages 100 lines 120
SQL> col name format a10
SQL> col path format a40
SQL> select group_number, name, state, total_mb
2 from v$asm_diskgroup;
GROUP_NUMBER NAME STATE TOTAL_MB
------------ ---------- ---------------------- ----------
1 DISK MOUNTED 385186
SQL> select disk_number, name, path, total_mb
2 from v$asm_disk
3 where group_number = 1
4 order by 1;
DISK_NUMBER NAME PATH TOTAL_MB
----------- ---------- ---------------------------------------- ----------
0 DISK_0000 /dev/rdsk/c2t500601603022E66Ad0s1 128
1 DISK_0001 /dev/rdsk/c2t500601603022E66Ad0s6 24318
2 DISK_0002 /dev/rdsk/c2t500601603022E66Ad1s1 4096
3 DISK_0003 /dev/rdsk/c2t500601603022E66Ad1s3 4096
4 DISK_0004 /dev/rdsk/c2t500601603022E66Ad1s4 4096
5 DISK_0005 /dev/rdsk/c2t500601603022E66Ad1s5 4096
6 DISK_0006 /dev/rdsk/c2t500601603022E66Ad1s6 4092
7 DISK_0007 /dev/rdsk/c2t500601603022E66Ad2s4 1024
8 DISK_0008 /dev/rdsk/c2t500601603022E66Ad2s5 1024
9 DISK_0009 /dev/rdsk/c2t500601603022E66Ad2s6 1023
10 DISK_0010 /dev/rdsk/c2t500601603022E66Ad3s1 1024
11 DISK_0011 /dev/rdsk/c2t500601603022E66Ad3s3 1024
12 DISK_0012 /dev/rdsk/c2t500601603022E66Ad3s4 1024
13 DISK_0013 /dev/rdsk/c2t500601603022E66Ad3s5 1024
14 DISK_0014 /dev/rdsk/c2t500601603022E66Ad3s6 989
15 DISK_0015 /dev/rdsk/c2t500601603022E66Ad4s1 1024
16 DISK_0016 /dev/rdsk/c2t500601603022E66Ad4s3 1024
17 DISK_0017 /dev/rdsk/c2t500601603022E66Ad4s4 1024
18 DISK_0018 /dev/rdsk/c2t500601603022E66Ad4s5 1024
19 DISK_0019 /dev/rdsk/c2t500601603022E66Ad4s6 1023
20 DISK_0020 /dev/rdsk/c2t500601603022E66Ad5s1 100
21 DISK_0021 /dev/rdsk/c2t500601603022E66Ad5s3 100
22 DISK_0022 /dev/rdsk/c2t500601603022E66Ad5s4 100
23 DISK_0023 /dev/rdsk/c2t500601603022E66Ad5s5 100
24 DISK_0024 /dev/rdsk/c2t500601603022E66Ad5s6 100
25 DISK_0025 /dev/rdsk/c2t500601603022E66Ad5s7 99
26 DISK_0026 /dev/rdsk/c2t500601603022E66Ad6s1 100
27 DISK_0027 /dev/rdsk/c2t500601603022E66Ad6s3 100
28 DISK_0028 /dev/rdsk/c2t500601603022E66Ad6s4 100
29 DISK_0029 /dev/rdsk/c2t500601603022E66Ad6s5 100
30 DISK_0030 /dev/rdsk/c2t500601603022E66Ad6s6 100
31 DISK_0031 /dev/rdsk/c2t500601603022E66Ad6s7 99
32 DISK_0032 /dev/rdsk/c2t500601603022E66Ad7s1 100
33 DISK_0033 /dev/rdsk/c2t500601603022E66Ad7s3 100
34 DISK_0034 /dev/rdsk/c2t500601603022E66Ad7s4 100
35 DISK_0035 /dev/rdsk/c2t500601603022E66Ad7s5 100
36 DISK_0036 /dev/rdsk/c2t500601603022E66Ad7s6 100
37 DISK_0037 /dev/rdsk/c2t500601603022E66Ad7s7 99
38 DISK_0038 /dev/rdsk/c2t500601603022E66Ad8s6 50940
39 DISK_0039 /dev/rdsk/c2t500601603022E66Ad13s6 274252
已選擇40行。
ASM3磁盤組對應的裸設備也是不同的：
bash-3.00$ hostname
racnode3
bash-3.00$ export ORACLE_SID=+ASM3
bash-3.00$ sqlplus / as sysdba
SQL*Plus: Release 10.2.0.3.0 - Production on星期四11月26 18:03:01 2009
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
連接到:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP and Data Mining options
SQL> set pages 100 lines 120
SQL> col name format a10
SQL> col path format a40
SQL> select group_number, name, state, total_mb
2 from v$asm_diskgroup;
GROUP_NUMBER NAME STATE TOTAL_MB
------------ ---------- ---------------------- ----------
1 DISK MOUNTED 385186
SQL> select disk_number, name, path, total_mb
2 from v$asm_disk
3 where group_number = 1
4 order by 1;
DISK_NUMBER NAME PATH TOTAL_MB
----------- ---------- ---------------------------------------- ----------
0 DISK_0000 /dev/rdsk/c1t500601603022E66Ad0s1 128
1 DISK_0001 /dev/rdsk/c1t500601603022E66Ad0s6 24318
2 DISK_0002 /dev/rdsk/c1t500601603022E66Ad1s1 4096
3 DISK_0003 /dev/rdsk/c1t500601603022E66Ad1s3 4096
4 DISK_0004 /dev/rdsk/c1t500601603022E66Ad1s4 4096
5 DISK_0005 /dev/rdsk/c1t500601603022E66Ad1s5 4096
6 DISK_0006 /dev/rdsk/c1t500601603022E66Ad1s6 4092
7 DISK_0007 /dev/rdsk/c1t500601603022E66Ad2s4 1024
8 DISK_0008 /dev/rdsk/c1t500601603022E66Ad2s5 1024
9 DISK_0009 /dev/rdsk/c1t500601603022E66Ad2s6 1023
10 DISK_0010 /dev/rdsk/c1t500601603022E66Ad3s1 1024
11 DISK_0011 /dev/rdsk/c1t500601603022E66Ad3s3 1024
12 DISK_0012 /dev/rdsk/c1t500601603022E66Ad3s4 1024
13 DISK_0013 /dev/rdsk/c1t500601603022E66Ad3s5 1024
14 DISK_0014 /dev/rdsk/c1t500601603022E66Ad3s6 989
15 DISK_0015 /dev/rdsk/c1t500601603022E66Ad4s1 1024
16 DISK_0016 /dev/rdsk/c1t500601603022E66Ad4s3 1024
17 DISK_0017 /dev/rdsk/c1t500601603022E66Ad4s4 1024
18 DISK_0018 /dev/rdsk/c1t500601603022E66Ad4s5 1024
19 DISK_0019 /dev/rdsk/c1t500601603022E66Ad4s6 1023
20 DISK_0020 /dev/rdsk/c1t500601603022E66Ad5s1 100
21 DISK_0021 /dev/rdsk/c1t500601603022E66Ad5s3 100
22 DISK_0022 /dev/rdsk/c1t500601603022E66Ad5s4 100
23 DISK_0023 /dev/rdsk/c1t500601603022E66Ad5s5 100
24 DISK_0024 /dev/rdsk/c1t500601603022E66Ad5s6 100
25 DISK_0025 /dev/rdsk/c1t500601603022E66Ad5s7 99
26 DISK_0026 /dev/rdsk/c1t500601603022E66Ad6s1 100
27 DISK_0027 /dev/rdsk/c1t500601603022E66Ad6s3 100
28 DISK_0028 /dev/rdsk/c1t500601603022E66Ad6s4 100
29 DISK_0029 /dev/rdsk/c1t500601603022E66Ad6s5 100
30 DISK_0030 /dev/rdsk/c1t500601603022E66Ad6s6 100
31 DISK_0031 /dev/rdsk/c1t500601603022E66Ad6s7 99
32 DISK_0032 /dev/rdsk/c1t500601603022E66Ad7s1 100
33 DISK_0033 /dev/rdsk/c1t500601603022E66Ad7s3 100
34 DISK_0034 /dev/rdsk/c1t500601603022E66Ad7s4 100
35 DISK_0035 /dev/rdsk/c1t500601603022E66Ad7s5 100
36 DISK_0036 /dev/rdsk/c1t500601603022E66Ad7s6 100
37 DISK_0037 /dev/rdsk/c1t500601603022E66Ad7s7 99
38 DISK_0038 /dev/rdsk/c1t500601603022E66Ad8s6 50940
39 DISK_0039 /dev/rdsk/c1t500601603022E66Ad13s6 274252
已選擇40行。
顯然實例ASM1中DISK磁盤組中的磁盤/dev/rdsk/c2t1d0s1，對應的就是實例ASM2中DISK磁盤組中的磁盤/dev/rdsk/c2t500601603022E66Ad0s1，也就是實例ASM3中DISK磁盤組中的/dev/rdsk/c1t500601603022E66Ad0s1磁盤。雖然在三個服務器上三者的名稱都不相同，但是它們對應的是同一個裸設備。
雖然ASM有能力識別同一個磁盤在不同服務器上的不同的名稱，但是對于OCR和VOT盤來說，兩個節點上的名稱不同是會報錯的。在安裝時指定的安裝節點上的名稱，Oracle并不會檢查兩個節點上的名稱是否不一致，也不會報錯。但是安裝結束后，在非安裝節點上執行$ORA_CLS_HOME/root.sh腳本時，Oracle會根據安裝節點上的磁盤名稱尋找裸設備，如果找不到對應的設備，或者發現兩個節點對應的裸設備不一致就會報錯。
最簡單的辦法是通過操作系統上的鏈接來解決這個問題。
比如當前的三個節點的RAC環境，由于不同服務器使用的網卡不同，導致掛載的裸設備的名稱也是不相同的，為了解決這個問題，通過在各個節點上建立相同的鏈接名稱/dev/rac/ocr和/dev/rac/vot，在不同的節點上指向相同的裸設備，而在CLUSTER的安裝過程中，統一指向這個相同的鏈接的名稱。
在節點1上：
bash-2.03$ hostname
racnode1
bash-2.03$ ls -l /dev/rac
total 4
lrwxrwxrwx 1 root other 18 Nov 26 16:52 ocr -> /dev/rdsk/c2t1d2s1
lrwxrwxrwx 1 root other 18 Nov 26 16:52 vot -> /dev/rdsk/c2t1d2s3
在節點2上：
bash-2.03$ hostname
racnode2
bash-2.03$ ls -l /dev/rac
total 4
lrwxrwxrwx 1 root other 33 Mar 14 2007 ocr -> /dev/rdsk/c2t500601603022E66Ad2s1
lrwxrwxrwx 1 root other 33 Mar 14 2007 vot -> /dev/rdsk/c2t500601603022E66Ad2s3
在節點3上：
bash-3.00$ hostname
racnode3
bash-3.00$ ls -l /dev/rac
total 4
lrwxrwxrwx 1 root root 33 Jul 1 16:44 ocr -> /dev/rdsk/c1t500601603022E66Ad2s1
lrwxrwxrwx 1 root root 33 Jul 1 16:44 vot -> /dev/rdsk/c1t500601603022E66Ad2s3
通過這種設置后，CLUSTER就可以順利的安裝了。
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