通过asm来存储数据库文件，在linux下能够通过asmlib的方式来管理块设备，也能够直接使用裸设备来建立asm磁盘。在asmlib方式下，磁盘设备启动顺序和名称的改变不会影响到asm的使用。但假设直接使用裸设备会怎么样那？我们知道asm会在磁盘中存储与asm有关的元数据，通过这些元数据asm能够了解磁盘的相关信息，因此理论上裸设备名称的改变不会影响asm的正常使用。以下，通过实验来验证一下。

首先看下面。裸设备的配置文件

node1

  1. [root@node1 ~]# cat /etc/udev/rules.d/60-raw.rules
  2. # Enter raw device bindings here.
  3. #
  4. # An example would be:
  5. #   ACTION=="add", KERNEL=="sda", RUN+="/bin/raw /dev/raw/raw1 %N"
  6. # to bind /dev/raw/raw1 to /dev/sda, or
  7. #   ACTION=="add", ENV{MAJOR}=="8", ENV{MINOR}=="1", RUN+="/bin/raw /dev/raw/raw2 %M %m"
  8. # to bind /dev/raw/raw2 to the device with major 8, minor 1.
  9.  
  10. ACTION=="add", KERNEL=="sdb1", RUN+="/bin/raw /dev/raw/raw1 %N"
  11. ACTION=="add", KERNEL=="sdb2", RUN+="/bin/raw /dev/raw/raw2 %N"
  12. ACTION=="add", KERNEL=="sdb5", RUN+="/bin/raw /dev/raw/raw3 %N"
  13. ACTION=="add", KERNEL=="sdb6", RUN+="/bin/raw /dev/raw/raw4 %N"
  14. ACTION=="add", KERNEL=="sdb7", RUN+="/bin/raw /dev/raw/raw5 %N"
  15. ACTION=="add", KERNEL=="sdb8", RUN+="/bin/raw /dev/raw/raw6 %N"
  16. ACTION=="add", KERNEL=="sdb9", RUN+="/bin/raw /dev/raw/raw7 %N"

node2:

  1. [root@node2 rules.d]# cat 60-raw.rules
  2. # Enter raw device bindings here.
  3. #
  4. # An example would be:
  5. #   ACTION=="add", KERNEL=="sda", RUN+="/bin/raw /dev/raw/raw1 %N"
  6. # to bind /dev/raw/raw1 to /dev/sda, or
  7. #   ACTION=="add", ENV{MAJOR}=="8", ENV{MINOR}=="1", RUN+="/bin/raw /dev/raw/raw2 %M %m"
  8. # to bind /dev/raw/raw2 to the device with major 8, minor 1.
  9.  
  10. ACTION=="add", KERNEL=="sdb1", RUN+="/bin/raw /dev/raw/raw1 %N"
  11. ACTION=="add", KERNEL=="sdb2", RUN+="/bin/raw /dev/raw/raw2 %N"
  12. ACTION=="add", KERNEL=="sdb5", RUN+="/bin/raw /dev/raw/raw3 %N"
  13. ACTION=="add", KERNEL=="sdb6", RUN+="/bin/raw /dev/raw/raw4 %N"
  14. ACTION=="add", KERNEL=="sdb7", RUN+="/bin/raw /dev/raw/raw5 %N"
  15. ACTION=="add", KERNEL=="sdb8", RUN+="/bin/raw /dev/raw/raw6 %N"
  16. ACTION=="add", KERNEL=="sdb9", RUN+="/bin/raw /dev/raw/raw7 %N"

asm下的磁盘信息例如以下：

  1. [oracle@node1 ~]$ export ORACLE_SID=+ASM1
  2. [oracle@node1 ~]$ sqlplus / as sysdba
  3.  
  4. SQL*Plus: Release 10.2.0.5.0 - Production on Sun Aug 31 12:55:25 2014
  5.  
  6. Copyright (c) 1982, 2010, Oracle.  All Rights Reserved.
  7.  
  8. Connected to:
  9. Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
  10. With the Partitioning, Real Application Clusters, OLAP, Data Mining
  11. and Real Application Testing options
  12.  
  13. SQL> col name for a30
  14. SQL> col label for a30
  15. SQL> col path for a30
  16. SQL> set linesize 200
  17. SQL> /
  18.  
  19. NAME			       LABEL			      PATH
  20. ------------------------------ ------------------------------ ------------------------------
  21. DG1_0000						      /dev/raw/raw3
  22. DG2_0000						      /dev/raw/raw4
  23. DG3_0000						      /dev/raw/raw5
  24. DG3_0001						      /dev/raw/raw6
  25. DG4_0000						      /dev/raw/raw7
  26. 							      /dev/raw/raw2
  27. 							      /dev/raw/raw1
  28.  
  29. 7 rows selected.
  30.  
  31. SQL> ho ssh node2
  32. Last login: Sat Aug 30 17:56:54 2014 from node1
  33. [oracle@node2 ~]$ export ORACLE_SID=+ASM2
  34. [oracle@node2 ~]$ sqlplus / as sysdba
  35.  
  36. SQL*Plus: Release 10.2.0.5.0 - Production on Sun Aug 31 12:56:38 2014
  37.  
  38. Copyright (c) 1982, 2010, Oracle.  All Rights Reserved.
  39.  
  40. Connected to:
  41. Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
  42. With the Partitioning, Real Application Clusters, OLAP, Data Mining
  43. and Real Application Testing options
  44.  
  45. SQL> col name for a30
  46. SQL> col label for a30
  47. SQL> col path for a30
  48. SQL> set linesize 200
  49. SQL> select name,label,path from v$asm_disk order by 1;
  50.  
  51. NAME			       LABEL			      PATH
  52. ------------------------------ ------------------------------ ------------------------------
  53. DG1_0000						      /dev/raw/raw3
  54. DG2_0000						      /dev/raw/raw4
  55. DG3_0000						      /dev/raw/raw5
  56. DG3_0001						      /dev/raw/raw6
  57. DG4_0000						      /dev/raw/raw7
  58. 							      /dev/raw/raw2
  59. 							      /dev/raw/raw1
  60.  
  61. 7 rows selected.

创建測试表：

  1. SQL> select file_name,tablespace_name from dba_data_files;
  2.  
  3. FILE_NAME				     TABLESPACE_NAME
  4. -------------------------------------------- ------------------------------
  5. +DG4/easy/datafile/system.272.856543875      SYSTEM
  6. +DG4/easy/datafile/undotbs1.273.856543885    UNDOTBS1
  7. +DG4/easy/datafile/sysaux.274.856543891      SYSAUX
  8. +DG4/easy/datafile/undotbs2.276.856543901    UNDOTBS2
  9. +DG4/easy/datafile/users.277.856543905	     USERS
  10.  
  11. SQL> create table t1 (id number,name varchar2(20)) tablespace users;
  12.  
  13. Table created.
  14.  
  15. SQL> insert into t1 values(1,111);
  16.  
  17. 1 row created.
  18.  
  19. SQL> insert into t1 select * from t1;
  20.  
  21. 1 row created.
  22.  
  23. SQL> /
  24.  
  25. 2 rows created.
  26.  
  27. SQL> /
  28.  
  29. 4 rows created.
  30.  
  31. SQL> /
  32.  
  33. 8 rows created.
  34.  
  35. SQL> /
  36.  
  37. 16 rows created.
  38.  
  39. SQL> /
  40.  
  41. 32 rows created.
  42.  
  43. SQL> /
  44.  
  45. 64 rows created.
  46.  
  47. SQL> commit;
  48.  
  49. Commit complete.
  50.  
  51. SQL> select count(*) from t1;
  52.  
  53.   COUNT(*)
  54. ----------
  55.        128
  56.  
  57. SQL> update t1 set id=rownum,name=rownum;
  58.  
  59. 128 rows updated.
  60.  
  61. SQL> commit;
  62.  
  63. Commit complete.

改动裸设备的路径名称并重起集群

  1. [root@node1 ~]# cat /etc/udev/rules.d/60-raw.rules
  2. # Enter raw device bindings here.
  3. #
  4. # An example would be:
  5. #   ACTION=="add", KERNEL=="sda", RUN+="/bin/raw /dev/raw/raw1 %N"
  6. # to bind /dev/raw/raw1 to /dev/sda, or
  7. #   ACTION=="add", ENV{MAJOR}=="8", ENV{MINOR}=="1", RUN+="/bin/raw /dev/raw/raw2 %M %m"
  8. # to bind /dev/raw/raw2 to the device with major 8, minor 1.
  9.  
  10. ACTION=="add", KERNEL=="sdb1", RUN+="/bin/raw /dev/raw/raw1 %N"
  11. ACTION=="add", KERNEL=="sdb2", RUN+="/bin/raw /dev/raw/raw2 %N"
  12. ACTION=="add", KERNEL=="sdb5", RUN+="/bin/raw /dev/raw/raw7 %N"
  13. ACTION=="add", KERNEL=="sdb6", RUN+="/bin/raw /dev/raw/raw6 %N"
  14. ACTION=="add", KERNEL=="sdb7", RUN+="/bin/raw /dev/raw/raw5 %N"
  15. ACTION=="add", KERNEL=="sdb8", RUN+="/bin/raw /dev/raw/raw4 %N"
  16. ACTION=="add", KERNEL=="sdb9", RUN+="/bin/raw /dev/raw/raw3 %N"
  1. [oracle@node1 ~]$ export ORACLE_SID=+ASM1
  2. [oracle@node1 ~]$ sqlplus / as sysdba
  3.  
  4. SQL*Plus: Release 10.2.0.5.0 - Production on Sun Aug 31 13:13:01 2014
  5.  
  6. Copyright (c) 1982, 2010, Oracle.  All Rights Reserved.
  7.  
  8. Connected to:
  9. Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
  10. With the Partitioning, Real Application Clusters, OLAP, Data Mining
  11. and Real Application Testing options
  12.  
  13. SQL> col name for a30
  14. SQL> col lable for a33
  15. SQL> col path for a33
  16. SQL> set linesize 222
  17. SQL> col label for a31
  18. SQL> /
  19.  
  20. NAME			       LABEL			       PATH
  21. ------------------------------ ------------------------------- ---------------------------------
  22. DG1_0000						       /dev/raw/raw7
  23. DG2_0000						       /dev/raw/raw6
  24. DG3_0000						       /dev/raw/raw5
  25. DG3_0001						       /dev/raw/raw4
  26. DG4_0000						       /dev/raw/raw3
  27. 							       /dev/raw/raw1
  28. 							       /dev/raw/raw2
  29.  
  30. 7 rows selected.
  31.  
  32. SQL> ho ssh oracle@node2
  33. Last login: Sun Aug 31 12:56:27 2014 from node1
  34. [oracle@node2 ~]$ export ORACLE_SID=+ASM2
  35. [oracle@node2 ~]$ sqlplus / as sysdba
  36.  
  37. SQL*Plus: Release 10.2.0.5.0 - Production on Sun Aug 31 13:14:31 2014
  38.  
  39. Copyright (c) 1982, 2010, Oracle.  All Rights Reserved.
  40.  
  41. Connected to:
  42. Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
  43. With the Partitioning, Real Application Clusters, OLAP, Data Mining
  44. and Real Application Testing options
  45.  
  46. SQL> col name for a31
  47. SQL> col label for a31
  48. SQL> col path for a31
  49. SQL> set linesize 211
  50. SQL> select name,label,path from v$asm_disk order by 1;
  51.  
  52. NAME				LABEL				PATH
  53. ------------------------------- ------------------------------- -------------------------------
  54. DG1_0000							/dev/raw/raw3
  55. DG2_0000							/dev/raw/raw4
  56. DG3_0000							/dev/raw/raw5
  57. DG3_0001							/dev/raw/raw6
  58. DG4_0000							/dev/raw/raw7
  59. 								/dev/raw/raw2
  60. 								/dev/raw/raw1
  61.  
  62. 7 rows selected.
  63.  
  64. SQL> exit
  65. Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
  66. With the Partitioning, Real Application Clusters, OLAP, Data Mining
  67. and Real Application Testing options
  68. [oracle@node2 ~]$ export ORACLE_SID=easy2
  69. [oracle@node2 ~]$ sqlplus / as sysdba
  70.  
  71. SQL*Plus: Release 10.2.0.5.0 - Production on Sun Aug 31 13:15:31 2014
  72.  
  73. Copyright (c) 1982, 2010, Oracle.  All Rights Reserved.
  74.  
  75. Connected to:
  76. Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
  77. With the Partitioning, Real Application Clusters, OLAP, Data Mining
  78. and Real Application Testing options
  79.  
  80. SQL> select count(*) from t1;
  81.  
  82.   COUNT(*)
  83. ----------
  84.        128
  85.  
  86. SQL> select min(id),max(id) from t1;
  87.  
  88.    MIN(ID)    MAX(ID)
  89. ---------- ----------
  90. 	 1	  128

由此可见，裸设备路径和名称的改变不会影响asm的使用。可是，我们依旧建议保持路径名称的稳定性，方便管理。

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