今天，在弄linux 下的oracle12c RAC环境时，在调整/dev/shm 大小调整时，遇到一些麻烦，幸好，最后都能解决问题，下面为解决过程：
[root@node01 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_node01-lv_root
36G 759M 33G 3% /
tmpfs 932M 0 932M 0% /dev/shm
/dev/sda1 485M 32M 428M 7% /boot
/dev/shm默认只有932m,也就是差不多1G，担心在ORACLE安装配置过程文件系统大小，不够用，就想着调大一些：
[root@node01 ~]# vi /etc/fstab
dev/mapper/vg_node01-lv_root / ext4 defaults 1 1
UUID=f1c91395-7698-4bf3-954a-adc8862fbe9b /boot ext4 defaults 1 2
tmpfs /dev/shm tdevpts /dev/pts dsysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
tmpfs /dev/shm t[root@node01 ~]# vi /etc/fstab Used Available Use% Mounted on
调整tmpfs /dev/shm 的大小，如下所示：
/dev/mapper/vg_node01-lv_root / ext4 defaults 1 1
UUID=f1c91395-7698-4bf3-954a-adc8862fbe9b /boot ext4 defaults 1 2
/dev/mapper/vg_node01-lv_swap swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults.size=1140850688 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
然后保存退出，并执行如下命令：
[root@node01 ~]# mount -o remount /dev/shm
mount: /dev/shm not mounted already, or bad option
有如上报错：
再尝试：
[root@node01 ~]# mount -o remount,rw /dev/shm
mount: /dev/shm not mounted already, or bad option
仍然有如上报错：
[root@node01 ~]# umount /dev/shm
[root@node01 ~]# mount /dev/shm
mount: wrong fs type, bad option, bad superblock on tmpfs,
missing codepage or helper program, or other error
(for several filesystems (e.g. nfs, cifs) you might
need a /sbin/mount.<type> helper program)
In some cases useful info is found in syslog – try
dmesg | tail or so
[root@node01 ~]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/vg_node01-lv_root
36744792 777004 34101244 3% /
/dev/sda1 495844 32411 437833 7% /boot
[root@node01 ~]# mount -o remount /dev/shm
mount: /dev/shm not mounted already, or bad option
[root@node01 ~]# mount -o remount /dev/shm
mount: /dev/shm not mounted already, or bad option
还是报错，并且，umount /dev/shm后，再mount 还是会报同样的错，
最好，通过以下命令来解决问题：
[root@node01 ~]# mount -o size=1500M -o nr_inodes=1000000 -o noatime,nodiratime -o remount /dev/shm
[root@node01 ~]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/vg_node01-lv_root
36744792 777132 34101116 3% /
tmpfs 1536000 0 1536000 0% /dev/shm
/dev/sda1 495844 32411 437833 7% /boot
最后，终于，将/dev/shm 大小调整到1500M,即是1.5G.
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