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Displaying the rate of change between Snapshot copies

You can use the snap delta command to view the rate of change between two Snapshot copies as well as the rate of change between a Snapshot copy and the active file system. This information can help you determine a suitable Snapshot copy schedule and Snapshot copy reserve.

About this task

Data ONTAP displays the rates of change in two tables. The first table displays rates of change between successive Snapshot copies. The second table displays a summary of the rate of change between the oldest Snapshot copy and the active file system. For details, see the na_snap(1) man page.

Step

  1. To display data change rates on a volume, enter the following command:
    snap delta vol_name

    vol_name is the name of the volume containing the Snapshot copies.

    Note: You can display change rates for all volumes by omitting the volume name.

    Example

    The following command lists the rates of change for the vol0 volume:

    system> snap delta vol0
    Volume vol0 working...
    From Snapshot To                 KB changed Time       Rate (KB/hour)
    ------------- ------------------ ---------- ---------- --------------
    hourly.0      Active File System 149812     0d 03:43   40223.985
    hourly.1      hourly.0           326232     0d 08:00   40779.000
    hourly.2      hourly.1           2336 1d    12:00      64.888
    hourly.3      hourly.2           1536 0d    04:00      384.000
    hourly.4      hourly.3           1420 0d    04:00      355.000
    nightly.0     hourly.4           1568 0d    12:00      130.666
    hourly.5      nightly.0          1400 0d    04:00      350.000
    nightly.1     hourly.5           10800 201d 21:00      2.229
    Summary...
    From Snapshot To                 KB changed Time       Rate (KB/hour)
    ------------- ------------------ ---------- ---------- --------------
    nightly.1     Active File System 495104     204d       20:43 100.697