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iSCSI Target Server Scalability Limits

Published: April 9, 2014

Applies To: Windows Server 2012



This topic provides the supported and tested Microsoft iSCSI Software Target limits. The following tables display the tested support limits and, where applicable, whether the limits are enforced.

The following tables provide the supported boundaries and interoperability for iSCSI Target Server in Windows Server 2012.

Base configuration table

 

Item Support Limit Enforced? Comment

iSCSI target instances per iSCSI Target Server

256

No

Initiators that can connect to the same iSCSI target instance

64

Enforced at 276

When used with failover clustering, you can have up to 64 nodes. iSCSI Target Server enforces the limiat at 64.

Initiators that can connect to one iSCSI Target Server

256

No

iSCSI logical units (LUs) and virtual disks per iSCSI Target Server

512

No

Testing configurations included: 8 LUs per target instance with an average over 64 targets, and 256 target instances with one LU per target.

iSCSI LUs and virtual disks per iSCSI target instance

128

Yes

Sessions can simultaneously connect to an iSCSI target instance (simultaneous sessions)

256

Yes

Snapshots per LU

512

Yes

There is a limit of 512 snapshots per independent iSCSI application volume.

Locally mounted virtual disks or snapshots per storage appliance

32

There is no functionality for iSCSI-specific locally mounted virtual disks.

Fault Tolerance table

 

Item Support Limit Enforced? Comment

Failover cluster nodes

5

No

Multiple active cluster nodes

Supported

Not applicable

Each active node in the failover cluster owns a different iSCSI Target Server clustered instance with other nodes also acting as the owner nodes.

Quorum type: node majority

Supported

Not applicable

Quorum type: node and disk majority

Supported

Not applicable

Quroum type: node and file share majority

Supported

Not applicable

Quroum type: No majority; disk only

Supported

Not applicable

Single-node failover cluster

Supported

Not applicable

Error recovery level (ERL)

0

Yes

Multiple connections per session (MC/S)

Not supported

Yes

Connections per session

1

Yes

Sessions can simultaneously connect to an iSCSI target instance (simultaneous sessions)

256

No

Multipath Input/Output (MPIO)

Supported

MPIO paths

4

No

LUs over MPIO per initiator on a non-clustered application server

256

No

LUs over MPIO per initiator on a clustered application server

256

Converting a stand-alone iSCSI Software Target to a failover cluster or vice versa

Supported

Not applicable

No VHD or target will be preserved.

Network

 

Item Support Limit Enforced? Comment

Maximum number of active network adapters

8

No

Applies to network adapters that are dedicated to iSCSI traffic, rather than the total number of network adapters in the appliance.

Portal (IP addresses) supported

64

Yes

Network port speed

1Gbps, 10 Gbps, 40Gbps

No

IPv4

Supported

Not applicable

IPv6

Supported

Not applicable

TCP offload

Supported

Not applicable

Leverage Large Send (segmentation), checksum, interrupt moderation, and RSS offload

iSCSI offload

Not supported

Jumbo frames

Supported

Not applicable

IPSec

Supported

Not applicable

iSCSI virtual disks

 

Item Support limit Enforced? Comment

From an iSCSI initiator, which converts the iSCSI target disk from a fixed disk to a dynamic disk

Yes

No

VHD minimum size format

8 MB

Yes

Applies all supported VHD types: parent, differencing, and fixed.

Parent VHD size

2088960 MB

Yes

Fixed VHD size

16776703 MB

Yes

Differencing VHD size

2088960 MB

Yes

VHD fixed format

Supported

Not applicable

VHD differencing format

Supported

Not applicable

Snapshots cannot be taken of differencing VHD-based iSCSI virtual disks.

VHD dynamic format

Not supported

Yes

FAT/FAT32 (hosting volume of the VHD)

Not supported

Yes

CSV v2

Not supported

Yes

ReFS

Supported

Not applicable

NTFS

Supported

Not applicable

NTFS cluster size

Supports all cluster sizes

Non-Microsoft CFS

Not supported

Yes

Number of differencing VHDs per parent VHD

256

No

Number of boot operating systems that can be installed on one VHD

1

No

Thin provisioning

Not supported

Not applicable

LUN shrink

Not supported

Not applicable

LUN cloning

Not supported

Not applicable

Snapshots

 

Item Support limit Enforced? Comment

Snapshot create

Supported

Not applicable

Snapshot restore

Supported

Not applicable

Writable snapshots

Not supported

Not applicable

Snapshot – convert to full

Not supported

Not applicable

Snapshot – online rollback

Not supported

Not applicable

Snapshot – convert to writable

Not supported

Not applicable

Snapshot - redirection

Not supported

Not applicable

Snapshot - pinning

Not supported

Not applicable

Local mount

Supported

Not applicable

Dynamic disk snapshots cannot be locally mounted.

Windows operating systems on which the VDS and VSS hardware providers are supported

noteNote
The following operating systems are supported as long as they have the latest Service Pack (SP) installed.

 

Operating system Support limit Enforced?

Windows Server 2008 x64

Supported

Yes

Windows Server 2008 x86

Supported

Yes

Windows Storage Server 2008 x64

Supported

Yes

Windows Storage Server 2008 x86

Supported

Yes

Windows Storage Server 2008 R2 x64

Supported

Yes

Windows Server 2008 R2 x64

Supported

Yes

iSCSI Software Target provider interoperability

 

iSCSI target version iSCSI provider version Supported Comment

3.2 (Windows Server 2008)

3.2 (Windows 8)

Supported (must install 3.2 providers on Windows Server 2012)

3.3 (Windows Server 2008 R2

3.3 (Windows 8)

Supported (must install 3.3 providers on Windows Server 2012)

6.2 (Windows 8)

6.2 (Windows 8)

Supported (must install provider features on Windows 8)

6.2 (Windows 8)

3.4 (Windows Server 2008 R2

6.2 (Windows 8)

3.4 (Windows Server 2008

Different versions of the providers are not supported on the same computer with the initiator.

Windows HPC Server°2008°R2°x64

3.3 (on Windows HPC Server)

Windows HPC Server°2008

Not applicable (the provider will be part of the HPC release)

The following list provides additional resources about iSCSI Target Server and related technologies.

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