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• Castor-CFS-FileId: the filesystem id for the file in the CFS name space

• Castor-CFS-Uid: the file's user id at the time it was stored

• Castor-CFS-Gid: the file's group id at the time it was stored

• Castor-CFS-Mode: the file's permission mode in decimal at the time it was stored

The mechanisms to add both custom metadata and life cycle retention policies to files stored in DX

Storage via DX Storage CFS are outlined in the sections below.

3.6.1. Custom Metadata

The 'cfs-admin metadata' utility allows a root user to administer the custom metadata that is

attached to newly created files when they are ready to be stored in DX Storage (last file close plus

5 seconds). Custom metadata applies to all files stored in a particular mountpoint and, like all DX

Storage metadata, is immutable after the file is stored in DX Storage. Thus, changing the custom

metadata for a CFS file system will affect only new or modified files and will not change metadata for

files that were previously written. To add metadata to a mountpoint, execute the following command

as the root user:

$ sudo su -

# cfs-admin metadata --set [--name=NAME] [--value=VALUE] <mount-root>

where <mount-root> is the full path for the CFS mountpoint to which the metadata should be

attached. For example, to add an attribute of 'Department' with a value of 'Legal' to all files in the

legal mountpoint, you would execute the following command:

# cfs-admin metadata --set --name=Department --value=Legal /mnt/legal

Metadata names must be unique within a mountpoint and may contain up to 100 characters. A '--

set' command that uses a pre-existing metadata name with new or different values will overwrite the

previous values. By default, metadata is cached for 60 seconds so attachment of new or updated

metadata to new files written to the mountpoint will be delayed until the cache is refreshed.

To add multiple values for a name, simply append them with a separator. For instance, a mountpoint

that had files that applied to both the legal department and the accounting department might

have a metadata value of '--value=Legal, Accounting'. Metadata values may contain up to 1536

characters. A "no space left on device" error will be returned if the size limit is exceeded. ASCII

control characters are not supported and any preceding or trailing whitespace will be discarded from

both the name and the value.

To view all the existing metadata name/value pairs for a mountpoint, the 'get' action for the cfs-

admin metadata utility can be utilized. For instance, to view all metadata for the legal mountpoint the

following command would be executed:

# cfs-admin metadata --get /mnt/legal

Similarly, if you wanted to see the value for a particular metadata name, you would include the

name in the command. For example:

# cfs-admin metadata --get --name=Department

To delete a metadata attribute for a mountpoint, the 'delete' action for the cfs-admin metadata utility

can be executed. For instance, to delete the Department=Legal attribute example added to the legal

mountpoint above, the following command could be executed:

/mnt/legal

Version 2.6

February 2011