首先我们必须知道ASM实例的alert日志位置，ASM实例的alert日志默认路径为：/u01/app/grid/diag/asm/+asm/+ASM1/trace/alert_+ASM1.log，在该日志里面告诉了我们非常重要的信息，以下几个实际应用场景。

1、ASM的alert日志作为ASM实例的晴雨表，向我们展示了ASM实例的“健康状态”。

2、ASM的alert日志告诉了我们创建磁盘组时候的操作系统块设备和ASM 磁盘的对应关系。例如：/dev/sdb1  和ASMDISK1对应。

以下为ASM实例的alert日志实际输出：

Tue Jun 16 19:27:14 2015

SQL> CREATE DISKGROUP DATA NORMAL REDUNDANCY  DISK 'ORCL:ASMDISK1',

'ORCL:ASMDISK2',

'ORCL:ASMDISK3',

'ORCL:ASMDISK4' ATTRIBUTE 'compatible.asm'='11.2.0.0.0','au_size'='1M' /* ASMCA */

NOTE: Assigning number (1,0) to disk (ORCL:ASMDISK1)

NOTE: Assigning number (1,1) to disk (ORCL:ASMDISK2)

NOTE: Assigning number (1,2) to disk (ORCL:ASMDISK3)

NOTE: Assigning number (1,3) to disk (ORCL:ASMDISK4)

NOTE: initializing header on grp 1 disk ASMDISK1

NOTE: initializing header on grp 1 disk ASMDISK2

NOTE: initializing header on grp 1 disk ASMDISK3

NOTE: initializing header on grp 1 disk ASMDISK4

GMON updating for reconfiguration, group 1 at 3 for pid 23, osid 1888

NOTE: group 1 PST updated.

NOTE: initiating PST update: grp = 1

GMON updating group 1 at 4 for pid 23, osid 1888

NOTE: group DATA: initial PST location: disk 0000 (PST copy 0)

NOTE: group DATA: initial PST location: disk 0001 (PST copy 1)

NOTE: group DATA: initial PST location: disk 0002 (PST copy 2)

NOTE: PST update grp = 1 completed successfully

NOTE: cache registered group DATA number=1 incarn=0x15f22f86

NOTE: cache began mount (first) of group DATA number=1 incarn=0x15f22f86

NOTE: cache opening disk 0 of grp 1: ASMDISK1 label:ASMDISK1

NOTE: cache opening disk 1 of grp 1: ASMDISK2 label:ASMDISK2

NOTE: cache opening disk 2 of grp 1: ASMDISK3 label:ASMDISK3

NOTE: cache opening disk 3 of grp 1: ASMDISK4 label:ASMDISK4

* allocate domain 1, invalid = TRUE

NOTE: attached to recovery domain 1

NOTE: cache creating group 1/0x15F22F86 (DATA)

NOTE: cache mounting group 1/0x15F22F86 (DATA) succeeded

NOTE: allocating F1X0 on grp 1 disk ASMDISK1

NOTE: allocating F1X0 on grp 1 disk ASMDISK2

NOTE: allocating F1X0 on grp 1 disk ASMDISK3

NOTE: Created Used Space Directory for 1 threads

NOTE: diskgroup must now be re-mounted prior to first use

NOTE: cache dismounting (clean) group 1/0x15F22F86 (DATA)

NOTE: messaging CKPT to quiesce pins Unix process pid: 1888, image: oracle@racdb1 (TNS V1-V3)

NOTE: lgwr not being msg'd to dismount

freeing rdom 1

NOTE: detached from domain 1

NOTE: cache dismounted group 1/0x15F22F86 (DATA)

GMON dismounting group 1 at 5 for pid 23, osid 1888

GMON dismounting group 1 at 6 for pid 23, osid 1888

NOTE: Disk ASMDISK1 in mode 0x7f marked for de-assignment

NOTE: Disk ASMDISK2 in mode 0x7f marked for de-assignment

NOTE: Disk ASMDISK3 in mode 0x7f marked for de-assignment

NOTE: Disk ASMDISK4 in mode 0x7f marked for de-assignment

SUCCESS: diskgroup DATA was created

3、ASM的alert日志告诉了我们ASM实例使用的参数文件spfile路径和文件名。

以下为ASM实例的alert日志实际输出：

NOTE: Advanced to new COD format for group DATA

NOTE: updated gpnp profile ASM diskstring:

NOTE: updated gpnp profile ASM SPFILE to +DATA/db-cluster/asmparameterfile/registry.253.882559645

Tue Jun 16 19:27:26 2015

4、ASM的alert日志告诉了我们RAC下心跳网络的网卡和IP地址信息、MAC地址等。

以下为ASM实例的alert日志实际输出：

Private Interface 'em3:1' configured from GPnP for use as a private interconnect.

[name='em3:1', type=1, ip=169.254.31.158, mac=b8-2a-72-e0-18-3b, net=169.254.0.0/17, mask=255.255.128.0, use=haip:cluster_interconnect/62]

Private Interface 'em4:1' configured from GPnP for use as a private interconnect.

[name='em4:1', type=1, ip=169.254.167.137, mac=b8-2a-72-e0-18-3c, net=169.254.128.0/17, mask=255.255.128.0, use=haip:cluster_interconnect/62]

Public Interface 'em1' configured from GPnP for use as a public interface.

[name='em1', type=1, ip=172.28.254.31, mac=b8-2a-72-e0-18-39, net=172.28.254.0/24, mask=255.255.255.0, use=public/1]

CELL communication is configured to use 0 interface(s):

CELL IP affinity details:

NUMA status: NUMA system w/ 2 process groups

cellaffinity.ora status: cannot find affinity map at '/etc/oracle/cell/network-config/cellaffinity.ora' (see trace file for details)

CELL communication will use 1 IP group(s):

Grp 0:

Picked latch-free SCN scheme 3

Using LOG_ARCHIVE_DEST_1 parameter default value as /u01/app/11.2.0/grid/dbs/arch

5、ASM的alert日志告诉了我们voting文件在具体位置

以下为ASM实例的alert日志实际输出：

NOTE: Attempting voting file refresh on diskgroup DATA

NOTE: Refresh completed on diskgroup DATA

. Found 3 voting file(s).

NOTE: Voting file relocation is required in diskgroup DATA

NOTE: Attempting voting file relocation on diskgroup DATA

NOTE: Successful voting file relocation on diskgroup DATA

NOTE: Attempting voting file refresh on diskgroup DATA

NOTE: Refresh completed on diskgroup DATA

. Found 3 voting file(s).

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