Retrieving data about resources by using a REST API command line utility

You can connect to the REST API for IBM Spectrum Control and retrieve data by using a REST command line utility.

You can use any REST command line utility, for example, GNU Wget. To access information about the GNU Wget utility, go to https://www.gnu.org/software/wget/.

The IBM Spectrum Control REST API is hosted here: https://<hostname>:9569/srm/REST/api/v1/.

You can enter a command to authenticate with the REST API and store a security token in a file to use in your later queries, for example, cookies.txt.

You can use the utility, by entering the following command:

wget --post-data "j_username=<user name>&j_password=<password>" 
--no-check-certificate --keep-session-cookies --save-cookies cookies.txt
 https://<hostname>:9569/srm/j_security_check

You can use the security token in all subsequent commands that are issued against the REST API, by entering the following command:

wget --no-check-certificate --load-cookies cookies.txt 
https://<hostname>:9569/srm/REST/api/v1/

Example (partial listing)

},
   {
      "Description": "Provides a list of ports belonging to a parent storage system. 
Format: \/StorageSystems\/<id>\/Ports For a list of ports associated with a 
port owner, specify the owner type and id in the URL.

To see a list of all storage systems, you can append the URL:

https://<hostname>:9569/srm/REST/api/v1/StorageSystems

To see more information about a resource type, you can further append the URL (where <Name> is the resource type, such as StorageSystems, Switches, Servers, etc.)

https://<hostname>:9569/srm/REST/api/v1/<Name>

To see more information about a specific resource, add the ID to the URL (where <id> is available from https://<hostname>:9569/srm/REST/api/v1/<Name>) :

https://<hostname>:9569/srm/REST/api/v1/<Name>/<id>

To query for volumes that belong to a specific storage system, enter:

 https://<hostname>:9569/srm/REST/api/v1/StorageSystems/57909/Volumes

Example (partial listing)

[
   {
      "Acknowledged": "No",
      "Allocated Space": "1.00",
      "Capacity": "1.00",
      "Controller": "Node 0",
      "Copy Relationship": "",
      "Easy Tier": "Tiered Pools\/No",
      "Encryption": "",
      "Enterprise HDD Capacity": "1.00",
      "Format": "FB",
      "Hosts": "18",
      "LSS or LCU": "00",
      "Last Data Collection": "Apr 10, 2016, 15:03:57",
      "Name": "CET_RA_vol",
      "Nearline HDD Capacity": "",
      "Physical Allocation": "Fully Allocated",
      "Pool": "General_Use_1",
      "RAID Level": "RAID 5",
      "SSD Capacity": "",
      "Service Class": "",
      "Shortfall": "",
      "Status": "Normal",
      "Storage System": "DS8000-2107-75BLG91-IBM",
      "Storage Virtualizer": "None",
      "Thin Provisioned": "No",
      "Ticket": "",
      "Tier Distribution": "0",
      "Unallocated Space": "0.00",
      "Unused Space": "",
      "Used Allocated Space": "",
      "Used Space": "1.00",
      "Virtualizer Disk": "None",
      "Volume ID": "0000",
      "Volume Number": "0",
      "Volume Unique ID": "75blg91\/0000",
      "id": "79852"
   },

The information that is provided in the Format: field in the example shows what combinations are possible. For example,

https://<hostname>:9569/srm/REST/api/v1/StorageSystems/<id>/Ports

Tips:

If the Format: field is omitted, you can add the ID of one resource to the URL.
The name elements in the URL are case-sensitive.
The names of resource types are plural.

If the URL is not used correctly, you might receive the following error message:

{"result":{"type":"E","msgId":"BPCUI0099E","time":"Apr 4, 2016 16:25:07","text":
"The storage resource is not available."}}

If the URL returns a blank page, it means that no data is available for the resource. For example, if you query an application for file shares and there are no file shares in the application, the resulting page is blank.

Table 1. IBM Spectrum Control REST API URL examples
IBM Spectrum® Control REST API	Description
`https://<hostname>:9569/srm/REST/api/v1/StorageSystems`	A list of all monitored storage systems.
`https://<hostname>:9569/srm/REST/api/v1/StorageSystems/2002`	Specific information for one storage system (ID is available from this URL: `https://<hostname>:9569/srm/REST/api/v1/StorageSystems`) .
`https://<hostname>:9569/srm/REST/api/v1/StorageSystems/2002/Volumes`	A list of all volumes for one storage system.
`https://<hostname>:9569/srm/REST/api/v1/StorageSystems/2002/Volumes/2465/Performance`	The available performance metrics for a volume.
`https://<hostname>:9569/srm/REST/api/v1/StorageSystems/2002/RemoteReplication`	The remote mirror replication relationships for storage systems.
`https://<hostname>:9569/srm/REST/api/v1/StorageSystems/2002/Volumes/2465/Performance/824?granularity=sample&startTime=1455818400000&endTime=1455904800000`	Sample performance granularity information and a start and end time for the performance data.

Note: IBM® Storage is changing the capacity terminology that is used in IBM Storage products to make it more consistent. The new capacity terminology is used in IBM Spectrum Control 5.3.6 or later. The new terminology is used in the GUI, but the names used in the REST API have not changed. The output from the REST API continues to use Allocated Space instead of Used Capacity, Physical Allocation instead of Used Capacity %, and so on.