Linux下多个盘符乱的问题处理
参考文档：
linux下man fstab命令查看帮助，有一段说明，可以使用UUID，或者LABEL= 来绑定盘。这里使用UUID来绑定
Instead of giving the device explicitly, one may indicate the filesystem that is to be mounted by its UUID or
LABEL (cf. e2label(8) or xfs_admin(8)), writing LABEL=<label> or UUID=<uuid>, e.g., `LABEL=Boot' or
`UUID=3e6be9de-8139-11d1-9106-a43f08d823a6'.
man mkfs.xfs 命令查看，设置label
-L label
Set the filesystem label. XFS filesystem labels can be at most 12 characters long; if label is longer than 12
characters, mkfs.xfs will not proceed with creating the filesystem. Refer to the mount(8) and xfs_admin(8)
manual entries for additional information.
-- 问题，在启动数据库的时候，报错，某一些文件或者目标不存在
SYS@test SQL> startup
ORA-01261: Parameter db_recovery_file_dest destination string cannot be translated
ORA-01262: Stat failed on a file destination directory
Linux-x86_64 Error: 2: No such file or directory
SYS@test SQL>-- 查看了下/etc/fstab下面的盘，有sdb、sdc、sdd、sde四个盘。查看四个盘对应的挂载点，发现里面的文件乱了，原来是启动后盘符乱了
/dev/mapper/ol_19cdg01-root / xfs defaults 0 0
UUID=357c1a07-7c12-48e6-a1b2-d9b7e2c608de /boot xfs defaults 0 0
/dev/mapper/ol_19cdg01-swap swap swap defaults 0 0/dev/sdb1 /u01 xfs defaults 0 0
/dev/sdc1 /oradata xfs defaults 0 0
/dev/sdd1 /arch xfs defaults 0 0
/dev/sde1 /mysql xfs defaults 0 0-- 可以看到，两次启动后，盘符是不一样的。比如两次sdd盘的大小就不一样
[root@19ctest mysql]# fdisk -l | grep sd
Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 41943039 19921920 8e Linux LVM
Disk /dev/sdb: 42.9 GB, 42949672960 bytes, 83886080 sectors
/dev/sdb1 2048 83886079 41942016 83 Linux
Disk /dev/sdc: 128.8 GB, 128849018880 bytes, 251658240 sectors
/dev/sdc1 2048 251658239 125828096 83 Linux
Disk /dev/sdd: 107.4 GB, 107374182400 bytes, 209715200 sectors
/dev/sdd1 2048 209715199 104856576 83 Linux
Disk /dev/sde: 128.8 GB, 128849018880 bytes, 251658240 sectors
/dev/sde1 2048 251658239 125828096 83 Linux
[root@19ctest mysql]#[root@19ctest ~]# fdisk -l | grep sd
Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 41943039 19921920 8e Linux LVM
Disk /dev/sdb: 42.9 GB, 42949672960 bytes, 83886080 sectors
/dev/sdb1 2048 83886079 41942016 83 Linux
Disk /dev/sdc: 128.8 GB, 128849018880 bytes, 251658240 sectors
/dev/sdc1 2048 251658239 125828096 83 Linux
Disk /dev/sdd: 128.8 GB, 128849018880 bytes, 251658240 sectors
/dev/sdd1 2048 251658239 125828096 83 Linux
Disk /dev/sde: 107.4 GB, 107374182400 bytes, 209715200 sectors
/dev/sde1 2048 209715199 104856576 83 Linux
[root@19ctest ~]#-- 找到盘和挂载点的对应关系后，打算使用uuid在/etc/fstab中绑定
scsi_id -g -u -d /dev/sdbsdb -- /u01 36000c2960d16839a1c4cd1fc74bfd28b
sde -- /mysql 36000c29cd2ab754f9d1f8d819b5ddf73
sdc -- /oradata 36000c29a0c36c71b884a788f3e52ae3a
sdd -- /arch 36000c29e5e90b68f2dbae8eba081503f-- 修改/etc/fstab，绑定如下，但是mount的时候，报错，找不到UUID
/dev/sdb1 /u01 xfs defaults 0 0
/dev/sdc1 /oradata xfs defaults 0 0
/dev/sdd1 /arch xfs defaults 0 0
/dev/sde1 /mysql xfs defaults 0 0uuid=36000c2960d16839a1c4cd1fc74bfd28b /u01 xfs defaults 0 0
uuid=36000c29a0c36c71b884a788f3e52ae3a /oradata xfs defaults 0 0
uuid=36000c29e5e90b68f2dbae8eba081503f /arch xfs defaults 0 0
uuid=36000c29cd2ab754f9d1f8d819b5ddf73 /mysql xfs defaults 0 0[root@19ctest ~]# mount -a
mount: can't find UUID=36000c2960d16839a1c4cd1fc74bfd28b
mount: can't find UUID=36000c29a0c36c71b884a788f3e52ae3a
mount: can't find UUID=36000c29e5e90b68f2dbae8eba081503f
mount: can't find UUID=36000c29cd2ab754f9d1f8d819b5ddf73
[root@19ctest ~]#
-- 仔细查看/etc/fstab中的内容，发现UUID=357c1a07-7c12-48e6-a1b2-d9b7e2c608de 这个UUID，和SICI_ID出来的结果不一样，原来这个UUID是使用blkid命令得出的
[root@19ctest ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdd 8:48 0 120G 0 disk
└─sdd1 8:49 0 120G 0 part
sdb 8:16 0 40G 0 disk
└─sdb1 8:17 0 40G 0 part
sr0 11:0 1 4.5G 0 rom
sde 8:64 0 100G 0 disk
└─sde1 8:65 0 100G 0 part
sdc 8:32 0 120G 0 disk
└─sdc1 8:33 0 120G 0 part
sda 8:0 0 20G 0 disk
├─sda2 8:2 0 19G 0 part
│ ├─ol_19cdg01-swap 252:1 0 2G 0 lvm [SWAP]
│ └─ol_19cdg01-root 252:0 0 17G 0 lvm /
└─sda1 8:1 0 1G 0 part /boot
[root@19ctest ~]# blkid /dev/sdd1
/dev/sdd1: UUID="7c8f7ccc-5ca5-4447-aeb4-edcc810fbfce" TYPE="xfs"
[root@19ctest ~]# blkid /dev/sdc1
/dev/sdc1: UUID="adb83729-7a67-4416-b4ad-97ec1d61b704" TYPE="xfs"
[root@19ctest ~]# blkid /dev/sdb1
/dev/sdb1: UUID="a716c33d-5e7c-422f-aa1e-7b09f1c5d568" TYPE="xfs"
[root@19ctest ~]# blkid /dev/sde1
/dev/sde1: UUID="dc153057-bd51-463a-84d1-90e5a38522d7" TYPE="xfs"
[root@19ctest ~]#UUID=a716c33d-5e7c-422f-aa1e-7b09f1c5d568 /u01 xfs defaults 0 0
UUID=adb83729-7a67-4416-b4ad-97ec1d61b704 /oradata xfs defaults 0 0
UUID=7c8f7ccc-5ca5-4447-aeb4-edcc810fbfce /arch xfs defaults 0 0
UUID=dc153057-bd51-463a-84d1-90e5a38522d7 /mysql xfs defaults 0 0-- 修改/etc/fstab,使用lsblk获取的uuid来绑定，问题解决。
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