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使用udev扩展ASM磁盘组
更新：HHH   时间：2023-1-7

环境：linux6.5 Oracle RAC集群两节点，Oracle版本11.2.0.4

1.1.1   查看相关内容：

（1 ）磁盘情况：

[root@db1 ~]# fdisk -l

Disk /dev/sda: 85.9 GB, 85899345920 bytes
255 heads, 63 sectors/track, 10443 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000d2f26
 
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64       10444    83373056   8e  Linux LVM
 
Disk /dev/sdb: 53.7 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
 
 
Disk /dev/sdd: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
 
 
Disk /dev/sdc: 53.7 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
 
 
Disk /dev/sde: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
 
 
Disk /dev/sdf: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
 
 
Disk /dev/sdg: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
 
 
Disk /dev/sdh: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
 
 
Disk /dev/mapper/vg_db1-lv_root: 53.7 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
 
 
Disk /dev/mapper/vg_db1-lv_swap: 8405 MB, 8405385216 bytes
255 heads, 63 sectors/track, 1021 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
 
 
Disk /dev/mapper/vg_db1-lv_home: 23.3 GB, 23278387200 bytes
255 heads, 63 sectors/track, 2830 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

（2 ）ASM 磁盘情况：

SQL> select GROUP_NUMBER,DISK_NUMBER,MOUNT_STATUS,STATE,TOTAL_MB,PATH,NAME from v$asm_disk order by GROUP_NUMBER,DISK_NUMBER;

GROUP_NUMBER DISK_NUMBER MOUNT_S STATE           TOTAL_MB PATH                 NAME
------------ ----------- ------- -------- ---------- -------------------- --------------------
            1                0 CACHED  NORMAL        51200 /dev/asmdiske       DATA_0000
            1                1 CACHED  NORMAL        51200 /dev/asmdiskf        DATA_0001
            2                0 CACHED  NORMAL        20480 /dev/asmdiskg       ARCH_0000
            3                0 CACHED  NORMAL       1024 /dev/asmdiskb           OCR_0000
            3                1 CACHED  NORMAL       1024 /dev/asmdiskc            OCR_0001
            3                2 CACHED  NORMAL       1024 /dev/asmdiskd           OCR_0002
 
6 rows selected.

结论：ASM 挂了6 块磁盘，通过容量可能看到有一块21.5G 的未挂载进来，也新盘还未使用，查看21.5G 的磁盘，我们发现有 /dev/sdg 和 /dev/sdh 。

（3 ）ASM 磁盘对应物理盘：

[root@db1 rules.d]# pwd

/etc/udev/rules.d

[root@db1 rules.d]# more 99-x-asmdisk_new.rules

KERNEL=="sd?", ENV{ID_SERIAL}=="36000c29c5362298e7a9898225a9f8ed6", SYMLINK+="asmdiskb", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="sd?", ENV{ID_SERIAL}=="36000c2963776a39f75310d2f2bd98287", SYMLINK+="asmdiskc", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="sd?", ENV{ID_SERIAL}=="36000c29dd4c14aa6a5e4f77f40427565", SYMLINK+="asmdiskd", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="sd?", ENV{ID_SERIAL}=="36000c292b56645878eb55e7811673ae2", SYMLINK+="asmdiske", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="sd?", ENV{ID_SERIAL}=="36000c29ec780367d4c1f845c880f7f0e", SYMLINK+="asmdiskf", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="sd?", ENV{ID_SERIAL}=="36000c297777b8958d4d4dd5cd7ddbc47", SYMLINK+="asmdiskg", OWNER="grid", GROUP="asmadmin", MODE="0660"

[root@db1 rules.d]#

（4 ）确认下是哪块磁盘未使用，查看磁盘ID ，与上面99-x-asmdisk_new.rules 内容对比后发现：

[root@db1 rules.d]# /lib/udev/scsi_id -g -u /dev/sdg      --- 该块磁盘是新盘，未使用

36000c293ef0d560ff854306446331b79

[root@db1 rules.d]# /lib/udev/scsi_id -g -u /dev/sdh

36000c297777b8958d4d4dd5cd7ddbc47

1.1.2   将未使用磁盘进行挂载

目标：/dev/sdg 到ASM 磁盘组2 即ARCH 当中

（1 ）首先修改文件99-x-asmdisk_new.rules ，修改完后如下内容：

[root@db1 rules.d]# more 99-x-asmdisk_new.rules

KERNEL=="sd?", ENV{ID_SERIAL}=="36000c29c5362298e7a9898225a9f8ed6", SYMLINK+="asmdiskb", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="sd?", ENV{ID_SERIAL}=="36000c2963776a39f75310d2f2bd98287", SYMLINK+="asmdiskc", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="sd?", ENV{ID_SERIAL}=="36000c29dd4c14aa6a5e4f77f40427565", SYMLINK+="asmdiskd", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="sd?", ENV{ID_SERIAL}=="36000c292b56645878eb55e7811673ae2", SYMLINK+="asmdiske", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="sd?", ENV{ID_SERIAL}=="36000c29ec780367d4c1f845c880f7f0e", SYMLINK+="asmdiskf", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="sd?", ENV{ID_SERIAL}=="36000c297777b8958d4d4dd5cd7ddbc47", SYMLINK+="asmdiskg", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="sd?", ENV{ID_SERIAL}=="36000c293ef0d560ff854306446331b79", SYMLINK+="asmdiskh", OWNER="grid", GROUP="asmadmin", MODE="0660"   ----增加新行

（2 ）重新载入udev 文件内容并启动

[root@db1 rules.d]# udevadm control --reload-rules

[root@db1 rules.d]# start_udev

Starting udev:                                             [  OK  ]

启动完之后可看到新加的磁盘 /dev/asmdiskh -> sdg

[root@db1 rules.d]# ls -l /dev/asm

total 0

[root@db1 rules.d]# ls -l /dev/asm*

lrwxrwxrwx 1 root root       3 May 19 15:13 /dev/asmdiskb -> sdf

lrwxrwxrwx 1 root root       3 May 19 15:13 /dev/asmdiskc -> sde

lrwxrwxrwx 1 root root       3 May 19 15:13 /dev/asmdiskd -> sdd

lrwxrwxrwx 1 root root       3 May 19 15:13 /dev/asmdiske -> sdb

lrwxrwxrwx 1 root root       3 May 19 15:13 /dev/asmdiskf -> sdc

lrwxrwxrwx 1 root root       3 May 19 15:13 /dev/asmdiskg -> sdh

lrwxrwxrwx 1 root root       3 May 19 15:13 /dev/asmdiskh -> sdg

（3 ）另一个节点做同样的处理

[root@db2 rules.d]# vi 99-x-asmdisk_new.rules

[root@db2 rules.d]# udevadm control --reload-rules

[root@db2 rules.d]# start udev

start: Unknown job: udev

[root@db2 rules.d]# start_udev

Starting udev:                                             [  OK  ]

[root@db2 rules.d]# ls -l /dev/asm*

lrwxrwxrwx 1 root root       3 May 19 15:17 /dev/asmdiskb -> sdf

lrwxrwxrwx 1 root root       3 May 19 15:17 /dev/asmdiskc -> sde

lrwxrwxrwx 1 root root       3 May 19 15:17 /dev/asmdiskd -> sdd

lrwxrwxrwx 1 root root       3 May 19 15:17 /dev/asmdiske -> sdb

lrwxrwxrwx 1 root root       3 May 19 15:17 /dev/asmdiskf -> sdc

lrwxrwxrwx 1 root root       3 May 19 15:17 /dev/asmdiskg -> sdh

lrwxrwxrwx 1 root root       3 May 19 15:17 /dev/asmdiskh -> sdg

/dev/asm:

total 0

1.1.3   在ASM 环境中将磁盘加入到磁盘组中：

（1 ）使用GRID 用户进入ASM 实例中，查询ASM 磁盘已经能看到该磁盘情况：

SQL> select GROUP_NUMBER,DISK_NUMBER,MOUNT_STATUS,STATE,TOTAL_MB,PATH,NAME from v$asm_disk order by GROUP_NUMBER,DISK_NUMBER;
 
GROUP_NUMBER DISK_NUMBER MOUNT_S STATE           TOTAL_MB PATH                 NAME
------------ ----------- ------- -------- ---------- -------------------- --------------------
            0                0 CLOSED  NORMAL           0 /dev/asmdiskh
            1                0 CACHED  NORMAL        51200 /dev/asmdiske       DATA_0000
            1                1 CACHED  NORMAL        51200 /dev/asmdiskf        DATA_0001
            2                0 CACHED  NORMAL        20480 /dev/asmdiskg       ARCH_0000
            3                0 CACHED  NORMAL       1024 /dev/asmdiskb           OCR_0000
            3                1 CACHED  NORMAL       1024 /dev/asmdiskc            OCR_0001
            3                2 CACHED  NORMAL       1024 /dev/asmdiskd           OCR_0002
 
7 rows selected.

（2 ）使用命令将磁盘加入到组ARCH 中。

使用 sqlplus ‘/as sysasm’ 登录

SQL> alter diskgroup ARCH ADD DISK '/dev/asmdiskh';

查看磁盘组容量已经增加

SQL> select NAME,FREE_MB,TOTAL_MB FROM V$ASM_DISKGROUP;
 
NAME                                     FREE_MB   TOTAL_MB
------------------------------ ---------- ----------
DATA                                         99315     102400
ARCH                                        39294      40960
OCR                                 2787       3072

确认另一个节点情况：

SQL> select GROUP_NUMBER,DISK_NUMBER,MOUNT_STATUS,STATE,TOTAL_MB,PATH,NAME from v$asm_disk order by GROUP_NUMBER,DISK_NUMBER;
 
GROUP_NUMBER DISK_NUMBER MOUNT_S STATE           TOTAL_MB PATH                 NAME
------------ ----------- ------- -------- ---------- -------------------- --------------------
            1                0 CACHED  NORMAL        51200 /dev/asmdiske       DATA_0000
            1                1 CACHED  NORMAL        51200 /dev/asmdiskf        DATA_0001
            2                0 CACHED  NORMAL        20480 /dev/asmdiskg       ARCH_0000
            2                1 CACHED  NORMAL        20480 /dev/asmdiskh       ARCH_0001
            3                0 CACHED  NORMAL       1024 /dev/asmdiskb           OCR_0000
            3                1 CACHED  NORMAL       1024 /dev/asmdiskc            OCR_0001
            3                2 CACHED  NORMAL       1024 /dev/asmdiskd           OCR_0002
 
7 rows selected.

至此，磁盘ASM 扩展完毕。
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