Expanding Storage

filesys expand?

A couple of things:

1.  You can type "disk show state" from a putty screen to see the available drives

2. If you have available drives, you can use the "storage add tier active ...." command to add the appropriate drives

3. Then once you've added the drives to the tier, you can use 'filesys expand' to expand the filesystem.

disk show state

Enclosure   Disk

            1  2  3  4  5  6  7  8  9  10 11 12

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

1           .  .  .  .  .  .  .  .  .  .  .  s

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

Legend   State          Count

------   ------------   -----

.        In Use Disks   11

s        Spare Disks    1

------   ------------   -----

Total 12 disks

admin@dd160# filesys expand

**** There is no storage available for expansion.

admin@dd160# storage show all

Active tier details:

Disk      Disks      Count   Disk         Additional

Group                        Size         Information

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

dg0       1.1-1.6    6       465.7 GiB

dg1       1.7-1.11   5       465.7 GiB

(spare)   1.12       1       465.7 GiB

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

Current active tier size: 4.0 TiB

Active tier maximum capacity: 4.1 TiB

Hi,

I suspect what you are seeing is correct and that all of the disks are in fact being used. To describe this further:

- The total amount of physical disk added to the system is ~5Tb

- The current active tier size is shown as ~4Tb

- The total post-comp size of DDFS, however, is only ~2.6Tb in size

As this is a DD160 some of the disk added to the system is used for the operating system/logs and so on - from above we can see that approximately 1Tb of disk is used for this purpose leaving ~4Tb.

This ~4Tb is added to the 'active tier' so that it is made available for DDFS to use as it seems fit. Note that DDFS carves the active tier up for a variety of different uses, for example:

- Container set - where backup data goes

- On disk indices

- Reserved blocks and so on

Some of these objects (such as on disk indices) can be extremely large and use a significant amount of space within the active tier which obviously reduces the maximum amount of space available for the container set (and therefore backup data).

The post-comp size of DDFS is actually reporting the maximum possible size of the container set (minus a small amount of space for metadata) at the current time. As a result we can see that objects except for the container set (i.e. on disk indices, reserved blocks and so on) consume approximately 1.4Tb disk space.

This is all as expected and entirely normal. Basically you should expect that the maximum file system size on a DDR will be significantly smaller than the amount of disk added to the system.

If you would like this look into and explained in more detail (so you can tell exactly where all of the disk is being used) I would recommend opening a case with Data Domain support. They will need to collect some further data from the DDR but will be able to tell you exactly where all of your disk space is being used.

Thanks, James