Setup Guide

Confirming UNMAP Priority

This topic provides steps for setting UNMAP priority on a DataStore.

Prerequisites

NOTE: Provisioning Virtual Disks with UNMAP set to a non-default priority on a DataStore provisioned on PowerStore may

result in an increased amount of write I/Os to the storage subsystem. It is therefore highly recommended to keep UNMAP

set to a default priority.

NOTE: Refer to Dell EMC KB article SLN320477 (https://www.dell.com/support/article/sln320477) for further unmap-

related recommendations when doing VMFS (Virtual Machine File System) bootstorm or failover with VMware SRM (Site

Recovery Manager) on VMFS datastores from ESXi hosts connected to PowerStore.

To set UNMAP priority on a datastore:

Steps

1. Access vSphere Client and locate the ESX Storage Configuartion panel.

2. Go to the Storage tab.

3. Right-click the affected DataStore.

4. Click Edit Space Reclamation.

5. Set the value (with ESX 6.7 or later, set to 100MB/s, with ESX 6.5, set to Low).

6. Click OK.

Configuring VMware vSphere with PowerStore

Storage in a Multiple Cluster Configuration

Use the listed recommended values when multiple clusters are connected to vSphere.

The following table lists the recommended vSphere settings when multiple storage clusters are connected to vSphere (in

addition to PowerStore). Follow these recommendations instead of other recommendations included in this chapter.

For reference, this table also includes the corresponding recommendations for settings when vSphere is connected to

PowerStore storage only.

Setting

Scope/Granularity Multi-Storage Setting PowerStore Only Setting

UCS FC Adapter Policy Per vHBA default default

Cisco nfnic

lun_queue_depth_per_path

Global default (32) default (32)

Disk.SchedNumReqOutstanding LUN default default

Disk.SchedQuantum Global default default

Disk.DiskMaxIOSize Global 1MB 1MB

XCOPY (/DataMover/

MaxHWTransferSize)

Global default (4MB) default (4MB)

XCOPY (Claim Rule) No Guidance No Guidance

vCenter Concurrent Clones

(config.vpxd.ResourceManager.m

axCostPerHos)

vCenter default (8) default (8)

● UCS FC Adapter Policy - The total number of I/O requests that can be outstanding on a per-virtual Host Bus Adapter

(vHBA) in UCS.

Host Configuration for VMware vSphere ESXi