The signifanct of /etc/default/fs

The signifanct of /etc/default/fs

The file fs contains the value, what default file system will create if run mkfs or newfs without the option of “-F vxfs”

# cd /etc/default

For example :

abcd-root> more fs

LOCAL=vxfs

/usr/sbin/mkfs /dev/vg02/rlvol1                                 This will create a vxfs file system

Creating a large-files filesystem

Creating a large-files filesystem

Creating a large files filesystem can be done with the mkfs command or the newfs command. The newfs command is a friendly interface to the mkfs command, and they both use the same options to create large-files and no-large-files filesystems. As of this release, the default behavior of these commands is to create a no-large-files filesystem. However, this default could be changed in future release of HP-UX.

Therefore, it is a good idea to explicitly set either the large files or no large files option.

The following examples show how to create a large-files filesystem.

• /usr/sbin/mkfs -F hfs -o largefiles /dev/vg02/rlvol1
• /usr/sbin/newfs -F hfs -o largefiles /dev/vg02/rlvol1
• /usr/sbin/mkfs -F vxfs -o largefiles /dev/vg02/rlvol1
• /usr/sbin/newfs -F vxfs -o largefiles /dev/vg02/rlvol1

The following examples show how to create a filesystem that will not support large files.

• /usr/sbin/mkfs -F hfs -o nolargefiles /dev/vg02/rlvol1
• /usr/sbin/newfs -F hfs -o nolargefiles /dev/vg02/rlvol1
• /usr/sbin/mkfs -F vxfs -o nolargefiles /dev/vg02/rlvol1
• /usr/sbin/newfs -F vxfs -o nolargefiles /dev/vg02/rlvol1

Changing a file system from one to the other

HP-UX also provides the ability to change a filesystem back and forth between large files and no large

files. This is provided by the fsadm command which also provides other filesystem administration capabilities.

It is important to realize that the conversion of these filesystems must be done on an unmounted filesystem, and fsck will be called after a successful conversion.

The following example shows how to convert a no-large-files filesystem to a large-files filesystem.

• /usr/sbin/fsadm -F hfs -o largefiles /dev/vg02/rlvol1

While the conversion of a no-large-files filesystem to a large-files filesystem should always succeed, the same is not true for converting a large-files filesystem to a no-large-files filesystem. The latter will only succeed if there are no large files on the filesystem. If even one large file is detected on the filesystem being converted, then the fsadm command will not convert the filesystem. Therefore, if it is necessary to convert a large-files filesystem that actually has large files on it to a no-large-files filesystem, the large files must be removed before conversion.

The following example shows how to convert a large-files filesystem to a no-large-files filesystem.

• /usr/sbin/fsadm -F hfs -o nolargefiles /dev/vg02/rlvol1

“maxvgs” parameter for Volume Group

Max VGs per system can be changed trhough the kernel tunable parameter “maxvgs”

Minimum Value is 0

Default Value is 16

Maximum Value is 256

This Tunable has been removed in version 11.31