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FSTAB DEFAULTS UPDATE
FSTAB DEFAULTS MANUAL

You need not reboot your system for the change to take effect, just make the Linux system aware about the modification you have made to the /etc/fstab file. dev/sda7 /chroot ext2 defaults,noatime 1 2 In our example below, we will set the noatime option to our /chroot file system.Įdit the fstab file vi /etc/fstab and add in the line that refer to /chrootfile system the noatime option after the

Note that the write time information to a file will continue to be updatedĪnytime the file is written to. Since writes can be somewhat expensive, this can result in measurable performance gains. The importance of the noatime setting is that it eliminates the need by the system to make writes to the file system for files which are simplyīeing read.

FSTAB DEFAULTS UPDATE

IfĪ file system has been mounted with this option, reading accesses to the file system will no longer result in an update to the atime information associated with the file like Linux has a special mount option for file systems called noatime that can be added to each line that addresses one file system in the /etc/fstab file.

should have no services depending on non-critial disks.īelow an example from my own SE 6.4 server using only the nofail option, because mounting with the nobootwait option present gives an error.For a news and mail For a proxy caches For a web pages.

FSTAB DEFAULTS MANUAL

should test this with a manual umount followed by a mount.

So, if you want to be on the safe side, you The bug reporters argue that both mountall and fsck should make use of the nofail option, and I agree with them. That makes sense, as mountall has not implemented nofail. Ubuntu has a bug listed: “mountall ignores nofail mount option”. fsck also skips non-existing devices that have the special file system type auto The /etc/fstab mount option nofail may be used to have fsck skip non-existing devices. Therefore non-existing devices may cause the system to enter file system repair mode during boot if the filesystem specific checker returns a fatal error. For example, using Scientific Linux (RHEL) 6.4, I cannot mount a partition that has the nobootwait set in fstab.Īccording to the fsck man page, this is what nofail does:įsck normally does not check whether the device actually exists before calling a file system specific checker. external drives, but if other services depend on the drive, then those services can fail.Īnother disadvantage of nobootwait is the fact that it is not supported by all Linux distributions.

Re: /etc/fstab defaults means also acl Post by TrevorH » Thu 5:17 pm It depends on the filesystem but acl has been default on ext3/4 filesystems for some time. TrevorH Forum Moderator Posts: 32156 Joined: Thu 10:40 am Location: Brighton, UK. The mtab file is the list of currently mounted file systems. If only there was a neat way to get the settings you need, in the order you need to enter them into the fstab file. Default file system mount attributes can be overridden in /etc/fstab. Some file systems such as XFS enable ACLs by default. Modern Red Hat based systems set ACL support as default on the root file system but not on user-created ext3 filesystems. You can add or remove further options if some fine-tuning is required. The normal default for ext3 file systems is equivalent to rw,suid,dev,exec,auto,nouser,async. That might be exactly what you want for e.g. /etc/fstab << here defaults to put a fs means also acl Top. The defaults option is a good opening gambit. It will halt the boot process if such filesystems cannot be checked, except when the mount option nofail is given.Ī possible disadvantage of nobootwait is that, if the disk is actually present, it will do the filecheck in the background and continue booting. Non-critical drives typically have this field set to 2.

fsck tries to do a filesystem check on all entries from fstab that have the sixth field set to 1 or 2.

device-specification mountpoint fs-type options/parameters dump pass.

This file uses the following format template. Both real and virtual filesystems are listed (like the swap space).

It will halt the boot process if such entries cannot be mounted, except when the mount option nobootwait is given. On many Unix systems, the /etc/fstab file (commonly called the 'Filesystem Table') lists filesystems that will be mounted on boot-up.

mountall tries to automount all entries from fstab that have the defaults or auto mount options.

The boot process can halt or exit to rescue mode when an external disk is unavailable or when an internal but non-critical disk is out of order. Problem description: You (re)boot your computer, e.g. door Evert Mouw External Drive icon, from the Wooden Drives Icons set by Teijo Räty.