Dell DX6000G Manuale di installazione e configurazione - Pagina 17
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start without these directories. You will also be asked if you would like to mount the configured
mountpoint immediately.
Once mounted, you will be able to view the specified CFS share at the time in the past specified by
your configured Timescape time. All timescape mounts are read-only but you may copy a deleted
file from a timescape mount to an active, current mount to recreate the file in the present.
Timescape mounts log to the same configured logging facility as the CFS share they are based on.
By default, timescape shares are configured to require less RAM, as a read-only file system requires
less resources than a current file system.
3.3.1. Deleting a Timescape Mount
Similar to an active mount, the 'cfs-admin mktimescape' utility can also be used to specify a
mountpoint to be deleted. As a root user, type the following command (where 'ttestMount1' equals
the name of the timescape mountpoint to be deleted):
# cfs-admin mktimescape --delete --tcfs-id=ttestMount1
Removing the timescape mount will not remove the name space nor will it remove the files' streams
from the DX Storage cluster.
3.3.2. Mounting a Timescape at an Alternate Time
Administrators needing to quickly mount a different time period for the same CFS share may do so
by manually mounting the timescape share with the time overridden by a timescape mount option
similar to the following:
mount -o remount,timescape=2010-09-15T12:34:20 /mnt/ttestMount1/
where the timescape value is an ISO 8601 time. This time is not persisted into the timescape share
configuration file, but prevents creation of a multiple timescape shares with different time periods for
the same CFS share. This mount option only applies to timescape mounts and cannot be used for
active, current mounts.
3.4. File Revisions and DX Storage Deletion
Each modification to a file stored in CFS creates a new object in DX Storage, with CNS keeping
track of the modification revision that is current for each file. Old revisions are deleted from DX
Storage via a background garbage collection process based on the configured time horizon.
Files that are explicitly deleted from the CFS mount are removed from DX Storage via the same
background process. After the time horizon, deleted files are no longer accessible via a timescape
mount.
3.5. Support and Management Utilities
3.5.1. cns-reporter
The cns-reporter utility provides basic capacity and content information for the Cluster Name Space.
It takes the following arguments:
Argument
-a ADDRESS or --address=ADDRESS
Copyright © 2011 Caringo, Inc.
All rights reserved
Definition and usage
Address of a DX Storage node used by the
CFS share
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Version 2.6
February 2011