7.2. Reducing Storage Capacity
Heketi also supports the reduction of storage capacity. You can reduce storage by deleting devices, nodes, and clusters. These requests can only be performed by using the Heketi CLI or from the command line API. For information on using command link API, see Heketi API https://github.com/heketi/heketi/wiki/API.
7.2.1. Deleting Devices
You can update the topology file by deleting the devices listed in the topolgy file.
For example, in the topology file,
/dev/sde
drive is deleted from the node:
In the file:
{ "node": { "hostnames": { "manage": [ "node4.example.com" ], "storage": [ "192.168.10.100" ] }, "zone": 1 }, "devices": [ "/dev/sdb", "/dev/sdc", "/dev/sdd", ] }
Load the topology file:
# heketi-cli topology load --json=topology-sample.json Found node 192.168.10.100 on cluster d6f2c22f2757bf67b1486d868dcb7794 Found device /dev/sdb Found device /dev/sdc Found device /dev/sdd Found node 192.168.10.101 on cluster d6f2c22f2757bf67b1486d868dcb7794 Found device /dev/sdb Found device /dev/sdc Found device /dev/sdd Found node 192.168.10.102 on cluster d6f2c22f2757bf67b1486d868dcb7794 Found device /dev/sdb Found device /dev/sdc Found device /dev/sdd Found node 192.168.10.103 on cluster d6f2c22f2757bf67b1486d868dcb7794 Found device /dev/sdb Found device /dev/sdc Found device /dev/sdd
7.2.2. Deleting Nodes
You can update the topology file by deleting the node listed in the file.
For example, in the topology file, delete the node and reload the topology file:
# heketi-cli topology load --json=topology-sample.json Found node 192.168.10.100 on cluster d6f2c22f2757bf67b1486d868dcb7794 Found device /dev/sdb Found device /dev/sdc Found device /dev/sdd Found node 192.168.10.101 on cluster d6f2c22f2757bf67b1486d868dcb7794 Found device /dev/sdb Found device /dev/sdc Found device /dev/sdd Found node 192.168.10.102 on cluster d6f2c22f2757bf67b1486d868dcb7794 Found device /dev/sdb Found device /dev/sdc Found device /dev/sdd
In this example, node 192.168.10.103 on cluster d6f2c22f2757bf67b1486d868dcb7794 is deleted.
7.2.3. Deleting Clusters
You can update the topology file by deleting the cluster and reload the topology file.