Dell DX6000G Manuale di installazione e configurazione - Pagina 12
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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.
Copyright © 2011 Caringo, Inc.
All rights reserved
ACL
manpage. To enable ACLs for a CFS mountpoint, you will
9
Version 2.6
February 2011