Dell PowerStore Service Scripts Guide

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Cluster management (svc_cluster_management)

This service script enables service providers to attach, detach, and view the status of each appliance in a cluster. If an appliance in a two-appliance cluster fails or can no longer communicate with the other appliance, the remaining appliance becomes unmanageable.

You can ask your service provider to detach the failed appliance from the cluster and restore the ability to manage the remaining appliance. Once the issue with the appliance is resolved, you can use the prep-attach and attach commands to reattach the appliance back into the cluster.

Usage

Function	Recovery
Mode	Normal
Usage	Service
Requires service user password?	N/A
Requires root privileges?	Yes
Might this cause data unavailability?	Yes
Might this cause data loss?	No
Scope	Appliance
Prerequisites	None

Format

svc_cluster_management [-h] [e] [-n <value>] {GetClusterStatus,DetachFailedAppliance,PrepReattachAppliance,ReattachAppliance,MovePrimaryAppliance}

Optional arguments

Qualifier	Description
-h, --help	Show the help message and exit.
-e, --eligibility_check	Show the nodes that are eligible to be the cluster primary node.
-n, --nodeid	Specify the node that becomes the new cluster primary node.

Actions

Action	Description
GetClusterStatus	Display current cluster status.
DetachFailedAppliance	Detach a failed appliance.
ReattachAppliance	Reattach an appliance.
PrepReattachAppliance	Prepare an appliance for reattachment.
MovePrimaryAppliance	Move the primary role to a different appliance. NOTE:Do not run perform the MovePrimaryAppliance action if the data path is offline or in a read-only mode. Performing the action at those times results in a loss of cluster management.

Positional arguments

Qualifier	Description
-n	Show the help message and exit.

Example

The following example shows the node with the ID 4 being designated as the primary cluster appliance:

svc_cluster_management MovePrimaryAppliance -n 4

Remove and reattach an appliance

If a two-appliance cluster has a failed appliance, you can use the svc_cluster_management script to detach the appliance and reattach it when the problem is resolved.

svc_cluster_management status
---CLUSTER STATUS---

local is primary: False
master id: 0

---APPLIANCE LIST---
id: 2
name: appliance_j8xxmd2
ip address: fd73:51fc:80d:0:201:4471:dcbb:4bce
online: False
id: 1
name: appliance_j8y1nd2
ip address: fd73:51fc:80d:0:201:4432:1df9:41da
online: True

Detach the failed appliance: svc_cluster_management detach

svc_cluster_management detach
detach failed appliance success!

Prepare to attach the appliance back to the cluster: svc_cluster_management prep_attach
```
svc_cluster_management prep_attach
prep reattach appliance success
```
Attach the appliance back to the cluster: svc_cluster_management attach
```
svc_cluster_management attach
reattach appliance success
```