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Version: 3.2

Updating Volumes using pxctl

This section will walk you through the commands for updating your Portworx volumes. Run the sudo /opt/pwx/bin/pxctl volume update command with the --help flag to list the available subcommands and flags.

Sharing and unsharing volumes​

You can use the --sharedv4 flag to share or unshare a given volume across multiple namespaces.

Say we've created a volume named clitest. You can see its settings using this command:

pxctl volume inspect clitest
Volume	:  970758537931791410
	Name            	 :  clitest
	Size            	 :  1.0 GiB
	Format          	 :  ext4
	HA              	 :  1
	IO Priority     	 :  LOW
	Shared          	 :  no
	Status          	 :  up
	State           	 :  detached
	Reads           	 :  0
	Reads MS        	 :  0
	Bytes Read      	 :  0
	Writes          	 :  0
	Writes MS       	 :  0
	Bytes Written   	 :  0
	IOs in progress 	 :  0
	Bytes used      	 :  33 MiB
	Replica sets on nodes:
		Set  0
			Node 	 :  10.99.117.133

Note that the shared field is shown as no, indicating that clitest is not a sharedv4 volume.

Before turning on sharing, make sure no applications are actively using the volume. Kubernetes users can scale down their application pods so that the volume is in a detached state.

Next, let's turn on sharing:

pxctl volume update clitest --sharedv4=on

At this point, the volume's sharing settings should have been updated. We can easily check by running pxctl volume inspect on the volume again:

pxctl volume inspect clitest
Volume	:  970758537931791410
	Name            	 :  clitest
	Size            	 :  1.0 GiB
	Format          	 :  ext4
	HA              	 :  1
	IO Priority     	 :  LOW
	Shared          	 :  v4
	Status          	 :  up
	State           	 :  detached
	Reads           	 :  0
	Reads MS        	 :  0
	Bytes Read      	 :  0
	Writes          	 :  0
	Writes MS       	 :  0
	Bytes Written   	 :  0
	IOs in progress 	 :  0
	Bytes used      	 :  33 MiB
	Replica sets on nodes:
		Set  0
			Node 	 :  10.99.117.133

As shown above, the shared field is set to v4 indicating that clitest is now a sharedv4 volume.

  • For more information about creating shared Portworx volumes through Kubernetes, refer to the Create sharedv4 PVCs page.

Changing a volume's sticky option​

For adding the --sticky attribute to a volume, use the following command:

pxctl volume update clitest --sticky=on

Doing a subsequent inspect on the volume shows the attributes field set to sticky:

pxctl volume inspect clitest
Volume	:  970758537931791410
	Name            	 :  clitest
	Size            	 :  1.0 GiB
	Format          	 :  ext4
	HA              	 :  1
	IO Priority     	 :  LOW
	Creation time   	 :  Feb 26 08:17:20 UTC 2017
	Shared          	 :  yes
	Status          	 :  up
	State           	 :  detached
	Attributes      	 :  sticky
	Reads           	 :  0
	Reads MS        	 :  0
	Bytes Read      	 :  0
	Writes          	 :  0
	Writes MS       	 :  0
	Bytes Written   	 :  0
	IOs in progress 	 :  0
	Bytes used      	 :  33 MiB
	Replica sets on nodes:
		Set  0
			Node 	 :  10.99.117.133

Increase volume size​

Here is an example of how to increase the size of an existing volume.

First, let’s create a volume with the default parameters (1 GiB):

pxctl volume create vol_resize_test
Volume successfully created: 485002114762355071

Next, we would want inspect our new volume:

pxctl volume inspect vol_resize_test
Volume	:  485002114762355071
	Name            	 :  vol_resize_test
	Size            	 :  1.0 GiB
	Format          	 :  ext4
	HA              	 :  1
	IO Priority     	 :  LOW
	Creation time   	 :  Apr 10 18:53:11 UTC 2017
	Shared          	 :  no
	Status          	 :  up
	State           	 :  detached
	Reads           	 :  0
	Reads MS        	 :  0
	Bytes Read      	 :  0
	Writes          	 :  0
	Writes MS       	 :  0
	Bytes Written   	 :  0
	IOs in progress 	 :  0
	Bytes used      	 :  32 MiB
	Replica sets on nodes:
		Set  0
			Node 	 :  172.31.55.104

Note the default volume size - 1 GiB.

note

In order to update the size of a given volume, you should first mount it. If it’s a shared volume, then this operation can be done from any of the nodes where the volume is attached.

Now that we've created a new volume, let's attach it to resize it.

pxctl host attach vol_resize_test
Volume successfully attached at: /dev/pxd/pxd485002114762355071

With vol_resize_test attached, the next steps are to create a new directory:

sudo mkdir /var/lib/osd/mounts/voldir

and then mount the volume:

pxctl host mount --path /var/lib/osd/mounts/voldir vol_resize_test
Volume vol_resize_test successfully mounted at /var/lib/osd/mounts/voldir

Lastly, to update the size of this volume to 5 GB do:

pxctl volume update vol_resize_test --size=5
Update Volume: Volume update successful for volume vol_resize_test

Let's verify the size with the following command:

pxctl volume inspect vol_resize_test
Volume	:  485002114762355071
	Name            	 :  vol_resize_test
	Size            	 :  5.0 GiB
	Format          	 :  ext4
	HA              	 :  1
	IO Priority     	 :  LOW
	Creation time   	 :  Apr 10 18:53:11 UTC 2017
	Shared          	 :  no
	Status          	 :  up
	State           	 :  Attached: xxxxxxxx-xxxx-xxxx-xxxx-293128e2d78b
	Device Path     	 :  /dev/pxd/pxd485002114762355071
	Reads           	 :  138
	Reads MS        	 :  108
	Bytes Read      	 :  974848
	Writes          	 :  161
	Writes MS       	 :  1667
	Bytes Written   	 :  68653056
	IOs in progress 	 :  0
	Bytes used      	 :  97 MiB
	Replica sets on nodes:
		Set  0
			Node 	 :  172.31.55.104

For more information about dynamically resizing a volume (PVC) using Kubernetes and Portworx, refer to the Resize a Portworx PVC page.

Update a volume's replication factor​

You can use the pxctl volume ha-update command to increase or decrease the replication factor for a given Portworx volume.

note

The maximum replication factor is 3.

Increase the replication factor​

Follow the instructions below to increase a volume's replication factor and create replicas on a node or storage pool:

  1. Identify a node or pool you want to create a replica on. The following example uses a node ID found using the cluster list command:

    pxctl cluster list
    Cluster ID: MY_CLUSTER_ID
    Status: OK

    Nodes in the cluster:
    ID					DATA IP		CPU		MEM TOTAL	MEM FREE	CONTAINERS	VERSION		STATUS
    xxxxxxxx-xxxx-xxxx-xxxx-d816357f634b	10.99.117.133	0.5		8.4 GB	7.9 GB		N/A		1.1.6-a879596	Online
    xxxxxxxx-xxxx-xxxx-xxxx-0dc1c09781d8	10.99.117.137	0.250313	8.4 GB	7.9 GB		N/A		1.1.6-a879596	Online
    xxxxxxxx-xxxx-xxxx-xxxx-55c967d1a963	10.99.117.135	0.625782	8.4 GB	7.9 GB		N/A		1.1.6-a879596	Online

  2. Begin replicating your volume to your target node or storage pool by entering the following pxctl volume ha-update command, specifying:

    • --repl= with the new number of replicas you want to create. This must be equal to your volume's current replication factor plus one.
    • --node with the node ID, node IP address, or pool UUID you want to create the replica(s) on.
    • The volume you want to increase the replication factor for.
    pxctl volume ha-update \
    --repl=2 \
    --node <node-ID|pool-uuid|node-IP>
    <volume-name>

  3. Monitor the replication operation by entering the following pxctl alerts show command:

    pxctl alerts show --type volume
    AlertID	VolumeID		Timestamp			Severity	AlertType			Description
    25	970758537931791410	Feb 26 22:02:04 UTC 2017	NOTIFY		Volume operation success	Volume (Id: 970758537931791410 Name: exampleVolume) HA updated from 1 to 2

  4. Once the replication completes and the new node is added to the replication set, enter the pxctl volume inspect command to verify the new replica exists:

    pxctl volume inspect <volume-name>
    Volume	:  970758537931791410
    	Name            	 :  exampleVolume
    	Size            	 :  1.0 GiB
    	Format          	 :  ext4
    	HA              	 :  2
    	IO Priority     	 :  LOW
    	Creation time   	 :  Feb 26 08:17:20 UTC 2017
    	Shared          	 :  yes
    	Status          	 :  up
    	State           	 :  detached
    	Attributes      	 :  sticky
    	Reads           	 :  0
    	Reads MS        	 :  0
    	Bytes Read      	 :  0
    	Writes          	 :  0
    	Writes MS       	 :  0
    	Bytes Written   	 :  0
    	IOs in progress 	 :  0
    	Bytes used      	 :  33 MiB
    	Replica sets on nodes:
    		Set  0
    			Node 	 :  10.99.117.133
    			Node 	 :  10.99.117.137

Decreasing the replication factor​

The ha-update command can be used to reduce the replication factor as well. Follow the instructions below to decrease a volume's replication factor and remove replicas from a node or storage pool:

  1. Begin removal of your volume's replica from your target node or storage pool by entering the following pxctl volume ha-update command, specifying:

    • --repl= with the new number of replicas. This must be equal to your volume's current replication factor minus one.
    • --node with the node ID, node IP address, or pool UUID you want to remove a replica from.
    • The volume you want to decrease the replication factor for.
    pxctl volume ha-update  \
    --repl=1 \
    --node <node-ID|pool-uuid|node-IP> \
    <volume-name>
    Update Volume Replication: Replication update started successfully for volume exampleVolume

  2. Monitor the replication operation by entering the following pxctl alerts show command:

    pxctl alerts show --type volume
    26	970758537931791410	Feb 26 22:58:17 UTC 2017	NOTIFY		Volume operation success	Volume (Id: 970758537931791410 Name: exampleVolume) HA updated

  3. Once the replica reduction completes, enter the pxctl volume inspect command to verify the target replica has been removed:

    pxctl volume inspect exampleVolume
    Volume	:  970758537931791410
    	Name            	 :  exampleVolume
    	Size            	 :  1.0 GiB
    	Format          	 :  ext4
    	HA              	 :  1
    	IO Priority     	 :  LOW
    	Creation time   	 :  Feb 26 08:17:20 UTC 2017
    	Shared          	 :  yes
    	Status          	 :  up
    	State           	 :  detached
    	Attributes      	 :  sticky
    	Reads           	 :  0
    	Reads MS        	 :  0
    	Bytes Read      	 :  0
    	Writes          	 :  0
    	Writes MS       	 :  0
    	Bytes Written   	 :  0
    	IOs in progress 	 :  0
    	Bytes used      	 :  33 MiB
    	Replica sets on nodes:
    		Set  0
    			Node 	 :  10.99.117.133

Update a volume's group ID​

To update or a new group ID to a volume, enter the pxctl volume update command with the --group option and the new group name:

pxctl volume update --group <groupName> <volumeName>
Update Volume: Volume update successful for volume exampleVolume
Warning: Updating group field will not affect the replica placement of already provisioned volumes.

Access a sharedv4 volume outside of a Kubernetes cluster​

By default, sharedv4 volumes can be accessed only within the Portworx cluster. However, you may need to access a sharedv4 volume outside of your Portworx/Kubernetes cluster. For example, a traditional non-Kubernetes application running on a VM needs to access data from a Kubernetes app running in the Kubernetes cluster.

To access a sharedv4 volume outside of the Kubernetes cluster, add the allow_ips label to the volume you wish to export, specifying a semi-colon separated list of IP addresses of non-Portworx Kubernetes nodes you wish to mount your sharedv4 volume to:

pxctl volume update <vol_name> --label "allow_ips=<Kubernetes-IP-1>;<Kubernetes-IP-2>"

Enable NFSv4 for a sharedv4 volume​

By default, sharedv4 volumes use the NFSv3 protocol. You can instruct Portworx to use NFSv4 for a specific sharedv4 volume by adding the following label:

pxctl volume update <vol_name> --label nfs_v4=true
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