mkextpool

The mkextpool command creates a fixed block or count key data (CKD) storage type extent pool.


>>-mkextpool--+-------------------------+-- -rankgrp--+-0-+----->
              '- -dev--storage_image_ID-'             '-1-'   

>-- -stgtype--+-fb--+--+-----------------------------+---------->
              '-ckd-'  '- -extentlimit--+-enabled--+-'   
                                        '-disabled-'     

>--+----------------------------------+------------------------->
   '- -limit--extent_limit_percentage-'   

>--+------------------------------------------+----------------->
   '- -threshold--extent_threshold_percentage-'   

>----extent_pool_name--"-"-------------------------------------><

Parameters

Notes:

An extent pool object is assigned to either rank group 0 or 1, which allows the extent pool to be managed by storage unit server 0 or 1 respectively.
Create extent pool objects before creating array and rank objects.
Create extent pools of a given type for both rank groups 0 and 1 so that volumes that are assigned to a volume group can be spread across both rank groups 0 and 1.

-dev storage_image_ID: (Optional) Specifies the storage image ID, which includes manufacturer, type, and serial number.
-rankgrp 0 | 1: (Required) Assigns the extent pool to either rank group 0 or 1. Rank group 0 is managed by server 0, and rank group 1 is managed by server 1.
Note: If an extent pool does not exist, you can issue the chrank command after an extent pool is created in order to assign the rank to the extent pool. In addition, you can create extent pools of a given type for both rank groups 0 and 1 so that volumes that are assigned to a volume group might be spread across both rank groups 0 and 1.
-stgtype fb | ckd: (Required) Specifies the volume storage type that is contained by this extent pool.
-extentlimit enabled | disabled: (Optional) Specifies that the extent limit function be enabled or disabled. Disabled is the default.
-limit extent_limit_percentage: (Optional) Specifies the maximum value of the percentage of allocated real extents that are allowed in this extent pool. This value defaults to 100 if not specified.
-threshold extent_threshold_percentage: (Optional) Specifies threshold as a percentage of the available real extents that is compared to the actual percentage of available real extents.
extent_pool_name | –: (Required) Specifies your extent pool name, which is limited to 16 characters.; If you specify the dash (-), this parameter information is automatically supplied.

Example (1750)

Invoking the mkextpool command

dscli>mkextpool -dev IBM.1750-68FA120 -rankgrp 0 -stgtype fb my_extpool

The resulting output

Sun Aug 11 02:23:49 PST 2004 IBM DS CLI Version: 5.0.0.0 DS: IBM.1750-68FA120

Extent pool P2 successfully created.