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2.2.4.1. ACLs

The cfs-admin mkfs utility does not by default enable Access Control Lists or ACLs. ACLs provide

more fine-grained file and directory access control than the basic user, group, owner permissions

and can be very useful in complex permission scenarios. For more information on ACLs functionality

and syntax, please refer to the

need to edit as root the /etc/fstab file and add 'acl' to the mount options as shown in the following

example:

testMount1 /mnt/testMount1 fuse.cfs config=testMount1.conf,noatime,acl

2.2.4.2. Access Time Updates

The cfs-admin mkfs utility by default disables updates to the last access time for both a file and

a directory by adding the 'noatime' options to the fstab entry for each mountpoint. Access time or

atime can have a significant impact on file system performance and is often not needed. This setting

does not impact update times when a file or directory is modified. If this information is required

for a particular mountpoint, the options can be modified to reenable access time by removing the

'noatime' value since access time updates are enabled by default. An updated fstab entry for the

'testMount1' mountpoint above would appear as:

testMount1 /mnt/testMount1 fuse.cfs config=testMount1.conf

2.3. Deleting a Mountpoint

In the event that you need to delete a mountpoint, the 'cfs-admin mkfs' utility can also be used to

specify the mountpoint and issue the delete. Prior to deleting the mountpoint, you should delete all

contents from the mountpoint and then unmount it to be sure there are no in process activities (see

Section 3.2). As a root user, type the following command (where 'testMount1' equals the name of

the mountpoint to be deleted):

# cfs-admin mkfs --delete --cfs-id=testMount1

The delete command should be used only when the mountpoint is no longer needed both currently

and historically. It may take some time to delete all the files and resources associated with a

mountpoint. This will not remove the name space nor will it remove the files' streams from the DX

Storage cluster.

2.4. Upgrading CFS

2.4.1. Upgrading from Versions 1.x

The 2.6 release now supports data migration from the previous 1.x versions of CFS that utilized a

MySQL database. Please contact your support resource for migration instructions.

2.4.2. Upgrading from Version 2.0

2.0 Ubuntu-based installations can migrate to 2.6 by installing a new Red Hat server with

configuration data and shares that exactly mirror the current installation and then switching out the

newly created CNS rootID with the previous Ubuntu-based one. The same DX Storage cluster must

be used for both the old and the new installation. Please reference the 'Restoring CFS' section of

the Setup and Configuration Guide for complete details.

ACL

manpage. To enable ACLs for a CFS mountpoint, you will

Version 2.6

February 2011