PowerStore: How to change volume node affinity

Résumé: This KB provides guidance on how to change volume node affinity.

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Instructions

Node affinity defines the node which offers optimized I/O for a volume.
Dynamic Node Affinity for volumes was introduced with PowerStoreOS v2.1. This allows the PowerStore to automatically change Node Affinity of a volume based on the performance of the system.

Attention: Setting a volume manually to Preferred_Node_A/B prevents the PowerStore from changing the Node Affinity based on system performance.
Volume node affinity should only be changed manually if recommended by Dell Technical Support or Engineering. Changing this setting randomly can result in poor performance.

This cannot be changed in the PowerStore Manager user interface, but can be changed using the PowerStore CLI (PSTCLI).


Checking current node affinity settings

Using the PowerStore Manager user interface

To see the current settings, check the PowerStore Manager user interface, under Storage > Volumes.

If you cannot see the node affinity column in the Volumes table, add it using the Show/Hide Table Columns:
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Using the PowerStore CLI (PSTCLI)

To list all volumes:
pstcli -d cluster_ip -u admin -p admin_password volume show -select name,node_affinity

Or to list only one volume:
pstcli -d cluster_ip -u admin -p admin_password volume -name your_volume show
The fields that are shown in green must be changed to match your information.  


Changing node affinity

Using the PowerStore CLI (PSTCLI)

To change node affinity:
pstcli -d cluster_ip -u admin -p admin_password volume -name your_volume set -node_affinity Preferred_Node_X


Possible affinity values for a volume are shown in this list. Only the values that are shown in bold can be set manually with PSTCLI.
System_Select_At_Attach Affinity is assigned when the volume is first attached. Can be manually set
System_Selected_Node_A System selected Node A as the optimized I/O path to volume. Reserved for system use
System_Selected_Node_B System selected Node B as the optimized I/O path to volume. Reserved for system use
Preferred_Node_A Node A is set as the optimized I/O path to volume. Can be manually set
Preferred_Node_B Node B is set as the optimized I/O path to volume. Can be manually set

If a volume has Preferred_Node_A/B set, and you want the system to manage the Node affinity again, set the volume System_Select_At_Attach.
If the volume has active Host mappings, it automatically changes to either System_Selected_Node_A or System_Selected_Node_B.

Produits concernés

PowerStore, PowerStore 1000X, PowerStore 1000T, PowerStore 3000X, PowerStore 3000T, PowerStore 5000X, PowerStore 5000T, PowerStore 500T, PowerStore 7000X, PowerStore 7000T

Produits

PowerStore Expansion Enclosure, PowerStore Rack, PowerStore 9000X, PowerStore 9000T
Propriétés de l’article
Numéro d’article: 000194291
Type d’article: How To
Dernière modification: 12 avr. 2023
Version:  7
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