Displaying data change rate between Snapshot copies

What is displayed

You can display the rate of change stored between two Snapshot copies as well as the rate of change between a Snapshot copy and the active file system. 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. See the na_snap(1) man page for details.

Displaying rates of change on a volume

To display data change rates on a volume, complete the following step.

Step	Action
1	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

Displaying rates of change between Snapshot copies

To display data change rates between two Snapshot copies, complete the following step.

Step	Action
1	Enter the following command: snap delta vol_name snap1 snap2 vol_name is the name of the volume containing the Snapshot copies. snap1 and snap2 are the names of the two Snapshot copies.

Example

The following command lists the rate of change between nightly.0 and hourly.1 of the vol0 volume:

system> snap delta vol0 nightly.0 hourly.1

Volume vol0 working...

From Snapshot To                 KB changed Time       Rate (KB/hour)

------------- ------------------ ---------- ---------- --------------

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

Summary...

From Snapshot To                 KB changed Time       Rate (KB/hour)

------------- ------------------ ---------- ---------- --------------

nightly.0     hourly.1           6860         2d 08:00 122.500