atime synchronization example

Content Platform Tenant Management Help

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The following example shows how to use the atime attribute to trigger retention for the existing wind.jpg object after atime synchronization has been enabled for the namespace; the example uses the NFS protocol:

  1. (Optional) Check the current retention setting for the wind.jpg object:
    cat /metadatamount/images/wind.jpg/retention.txt
    Deletion Allowed
  2. (Optional) Check the current permissions for the wind.jpg object:
    ls -l /datamount/images/wind.jpg
    -r--r--r-- 1 root root 23221 Mar 19 09:45 /datamount/images/wind.jpg

    Notice that the object has no write permissions.

  3. Set the atime attribute for the wind.jpg object:
    touch -a -t 201512310000 /datamount/images/wind.jpg
    Note: To set the value of the atime attribute, you can use the Windows SetFileTime library call, the Unix utime library call, or the Unix touch command.
  4. (Optional) Verify step 3:
    stat /datamount/images/wind.jpg
    File: "/datamount/images/wind.jpg"
    Size: 23221 Blocks: 112 IO Block: 32768 regular file
    Device: 15h/21d Inode: 18 Links: 1
    Access: (0444/-r--r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
    Access: 2015-12-31 00:00:00.000000000 -0500
    Modify: 2012-03-19 09:45:18.000000000 -0400
    Change: 2012-03-23 13:10:17.000000000 -0400
  5. Add write permissions to the wind.jpg object:
    chmod a+w /datamount/images/wind.jpg
  6. Remove all write permissions from the wind.jpg object:
    chmod a-w /datamount/images/wind.jpg
  7. (Optional) Verify that the retention setting has changed to match the atime value:
    cat /metadatamount/images/wind.jpg/retention.txt