Modify/etc/fstab in OracleLinux6.1 to enable tmpfs

Modify etcfstab in OracleLinux6.1 to enable tmpfs

Instructions on how to modify/etc/fstab to make tmpfs take effect in Oracle Linux 6.1

Instructions on how to modify/etc/fstab to make tmpfs take effect in Oracle Linux 6.1

[Date: 2012-03-01] Source: csdn Author: tianlesoftware [Font:]

During Oracle 11g installation, the following two problems are frequently encountered:

Oracle 11gORA-00845: MEMORY_TARGET not supported on this system description

[INS-35172] Target database memory (XXMB) exceeds the systems available shared memory ({0} MB) Solution

The solution is to add parameters in:/etc/fstab to enable the system to automatically load the configuration at startup:

Tmpfs/dev/shm tmpfs ults, size = 3G 0 0

The value of tmpfs is half of the system memory by default. This configuration can be used normally in the RedHat system, but I tested it in Oracle Linux 6.1 and found that this parameter cannot take effect, even if it is set to 3 GB, after the OS is started, check whether the size of tmpfs is half the memory size.

It takes effect after manual mount:

[Root @ rac1 ~] # Df-lh

Filesystem Size Used Avail Use % Mounted on

/Dev/sda3 14 GB 11G 2.4G 83%/

Tmpfs 3.0G 0 3.0G 0%/dev/shm

/Dev/sda1 194 M 46 M 139 M 25%/boot

Tmpfs 3.0G 0 3.0G 0%/dev/shm

[Root @ rac1 ~] # Cat/etc/fstab

#

#/Etc/fstab

# Created by anaconda on Tue Nov 2011

#

# Accessible filesystems, by reference, aremaintained under '/dev/disk'

# See man pages fstab (5), findfs (8), mount (8) and/or blkid (8) for more info

#

UUID = b1d2de8e-de31-4deb-b4e8-755c0ed01616/ext4 ults 1 1

UUID = 4df5aa5f-8ef0-473a-931a-51d11e21aa53/boot ext4 ults 1 2

UUID = 82085104-5021-4aaf-8e85-f213998108b6swap swap ults 0 0

Tmpfs/dev/shm tmpfs ults, size = 3G 0 0

Devpts/dev/pts devpts gid = 5, mode = 620 0 0

Sysfs/sys sysfs defaults 0 0

Proc/proc defaults 0 0

[Root @ rac1 ~] #

Therefore, if we only modify/etc/fstab, it will not be affected in Oracle Linux6.1.

We also need to modify another configuration file to make the modification of tmpfs in fstab take effect:/etc/rc. d/rc. sysinit

Step 1: comment out the following statements:

# Mount-f/dev/shm>/dev/null2> & 1

Step 2:

Find the following content in rc. sysinit:

# Mount all other filesystems (snapshot t forNFS and/proc, which is already

# Mounted). Contrary to standard usage,

# Filesystems are NOT unmounted in singleuser mode.

If ["$ READONLY "! = "Yes"]; then

Action $ "Mounting local filesystems:" mount-a-tnonfs, nfs4, smbfs, ncpfs, cifs, gfs, gfs2-O no_netdev

Else

Action $ "Mounting local filesystems:" mount-a-n-tnonfs, nfs4, smbfs, ncpfs, cifs, gfs, gfs2-O no_netdev

Fi

Add the tmpfs type in the following section:

If ["$ READONLY "! = "Yes"]; then

Action $ "Mounting local filesystems:" mount-a-tTmpfs,Nonfs, nfs4, smbfs, ncpfs, cifs, gfs, gfs2-O no_netdev

Else

Action $ "Mounting local filesystems:" mount-a-n-tTmpfs,Nonfs, nfs4, smbfs, ncpfs, cifs, gfs, gfs2-Ono_netdev

Fi

Then restart the OS:

[Root @ rac1 ~] # Df-lh

Filesystem Size Used Avail Use % Mounted on

/Dev/sda3 14 GB 11G 2.4G 83%/

Tmpfs 3.0G 88 K 3.0G 1%/dev/shm

/Dev/sda1 194 M 46 M 139 M 25%/boot

After the restart, tmpfs will automatically change according to our set value.