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Knowledge Base

Best practices for using vSAN 6.7, vSAN 7, and vSAN 8 iSCSI targets (57344)

Last Updated: 4/5/2024Categories: Best PracticesTotal Views: 25484Language:
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Purpose

This article provides information on best practices when hosting iSCSI targets from a vSAN 6.7, vSAN 7, and vSAN 8 clusters.

Resolution

The iSCSI LUNs hosted on vSAN are essentially large empty virtual disk (VMDK) container objects that are managed and protected by storage policy configurations. This means that the properties of these objects can be modified without bringing the LUNs offline. For instructions on configuring iSCSI as a service, see the Using the vSAN iSCSI Target Service section in the Administering VMware Virtual SAN guide  (Use the Product version drop down for vSAN versions in the link)

Key benefits

Supports Windows Server Failover Cluster (WSFC)

Performance service improvements for iSCSI targets

Preferred method for mapping VMDKs to physical Oracle RAC deployments

Improvements for sharing vSAN resources with physical workloads

Support for CHAP & Mutual CHAP authentication methods

iSCSI target objects are protected according to storage policies

Simplified storage management through the use of vCenter, vSAN API and PowerCLI

Current Limitations

Unsupported usage as a target for other ESXi hosts

Unsupported usage with third-party hypervisors

Migrations using raw device mapping (RDMs)

No support for Multiple Connections per Session (MCS)

Configuration maximums

Maximum 1024 LUNs per vSAN cluster

Maximum 128 targets per vSAN cluster

Maximum 256 LUNS per target

Maximum LUN size of 62TB

Maximum 128 iSCSI sessions per host

Maximum 4096 iSCSI IO queue depth per host

Maximum 128 outstanding writes per LUN

Maximum 256 outstanding IOs per LUN

Maximum 64 client initiators per LUN

Supported Operating Systems

Windows 10, Windows 2019, 2016 , 2012 R2, 2012, 2008 R2, 2008

RHEL 8, RHEL 7, RHEL 6, RHEL 5

SUSE® Linux Enterprise Server 12, SLES 11 SP4/SP3/SP1

For WSFC support, see Using SQL Server Failover Clustering on a vSphere 6.7 vSAN Datastore with vSAN iSCSI Target Service: Guidelines for supported configurations.

For more information on vSAN 6.7 contents and limitations, see the Release Notes here .
For more information on vSAN 7 contents and limitations, see the  Release Notes here .
For more information on vSAN 8 contents and limitations, see the Release notes here .

New updates in 7.0 U1 vSAN from iSCSI perspective to existing:

vSAN stretched cluster is supported with iSCSI configuration.

The handling of cross site iSCSI traffic between the initiator and target has been enhanced compare to previous version. Supports IO owner location config in stretched cluster to avoid cross site iSCSI traffic.

Related Information

vSAN iSCSI Target Usage Guide

 We can see the config max for vSAN iSCSI for vSAN 7.0 in configmax tool below which has same values for 6.7 and 7.0.
https://configmax.vmware.com  (Select vSphere >  Select vSphere version ( 6.7, 7.0 or 8.0 ) > Select vSAN)

e.g. :
vSAN 6.7 :  https://configmax.vmware.com/guest?vmwareproduct=vSphere&release=vSphere%206.7&categories=7-0
vSAN 7.0 : https://configmax.vmware.com/guest?vmwareproduct=vSphere&release=vSphere%207.0&categories=7-0
vSAN 8.0 : https://configmax.esp.vmware.com/guest?vmwareproduct=vSphere&release=vSphere%208.0&categories=7-0

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End Of General Availability of the Free vSphere Hypervisor (ESXi 7.x and 8.x) (2107518)

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Download and Install VMware Fusion (2014097)

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