1. Fujitsu Training Documentation ETERNUS Multipath (ETMP)
ETMP ETERNUS DX S3 / S4
ETERNUS DX S3 / S4
ETERNUS Multipath (ETMP)
ETMP ETERNUS DX S3 / S4
Copyright Fujitsu, Release June 2017
Copyright Fujitsu, Release June 2017

2. Fujitsu Training Documentation
ETMP ETERNUS DX S3 / S4
Contents (1)
Released Operating System and Licenses
Aims of ETERNUS Multi Path
Three Path Types of ETMP
Multipath Functionality
Multipath Failover in Relation to Path Types
ETMP ETERNUS DX S3 / S4
Copyright Fujitsu, Release June 2017
Copyright Fujitsu, Release June 2017

3. Fujitsu Training Documentation
ETMP ETERNUS DX S3 / S4
Contents (2)
ETERNUS Models and Path Types
ETMP within Windows® Environment
Supported HBA Connections
Unsupported HBA Connections
ETMP ETERNUS DX S3 / S4
Copyright Fujitsu, Release June 2017
Copyright Fujitsu, Release June 2017

4. Released Operating System and Licenses
The ETERNUS Multipath Driver is released for the following Operating Systems and can be downloaded free of charge from Fujitsu
Microsoft Windows Server® / 2003 R2 / 2008 / 2008 R2 / 2012 / R2 (32-bit, x64, ia64) / 2016 (Essentials, Standard, Datacenter)
HyperV is supported and Nano Server is not supported
AIX® 5L V5.2 / V5.3 / 6.1 / 7.1
Virtual I/O Server (VIOS) 1.5 / 2.1 / 2.2 with the restriction that SAN Boot is not supported
RedHat® RHEL V4 / V5 / V6 / V7
Please refer to the ETERNUS Multipath Driver for Linux installation manuals for restrictions
SUSE® SLES V9 / V10 / V11
Solaris®
Only released in selected Fujitsu geographical regions
ETMP ETERNUS DX S3 / S4
Copyright Fujitsu, Release June 2017

5. Aims of ETERNUS Multi Path
Fujitsu Training Documentation
Aims of ETERNUS Multi Path
ETMP ETERNUS DX S3 / S4
Multipath management software provides path redundancy to enhance the reliability and system performance
Failover / path redundancy
This enables a path to take over the processing of the failed path without host access being stopped
Improves the operation reliability of ETERNUS DX
Optimized path selection
With multipath configuration optimized path is automatically selected to access LUNs
Depending on specifications of multipath software this function is not available
ETMP ETERNUS DX S3 / S4
Copyright Fujitsu, Release June 2017
Copyright Fujitsu, Release June 2017

6. Three Path Types of ETMP
Fujitsu Training Documentation
Three Path Types of ETMP
ETMP ETERNUS DX S3 / S4
There are three path types implemented on a per LUN basis
Active path (optimized)
Active path (non-optimized)
Standby path / passive path
Paths from an assigned controller that is the primary owner of LUNs and being used for I/O access
Paths from a non-assigned controller that is the secondary owner of LUNs
Paths in standby state
These paths are powered and ready to operate
Do not operate unless all active paths fail
ETMP ETERNUS DX S3 / S4
Copyright Fujitsu, Release June 2017
Copyright Fujitsu, Release June 2017

7. Multipath Functionality
Fujitsu Training Documentation
Multipath Functionality
ETMP ETERNUS DX S3 / S4
The picture shows a typical I/O Multipath configuration
Vol-5 is mapped as LUN-1 to the server via two ETERNUS DX ports
One on CM#0 and one on CM#1
The Multipath driver is able to pass the data via both physical lines to this particular Volume in the DX system
In this configuration the Vol-1 is controlled by CM#0
The Multipath driver controls the utilization of the access paths
These exemplary named MP drivers send data directly to the assigned CM path as long as this CM is fully functional
ETERNUS Multipath Driver
VMware vSphere® Multi Path Driver
Data
LUN-1
MP-Driver
RAID-Group#0,
assigned CM = CM0
RAID-Group#1
assigned CM = CM1
ETERNUS DX
CM#0
CM#1
Vol-5
Vol-2
ETMP ETERNUS DX S3 / S4
Copyright Fujitsu, Release June 2017
Copyright Fujitsu, Release June 2017

8. Multipath Failover in Relation to Path Types
Fujitsu Training Documentation
Multipath Failover in Relation to Path Types
ETMP ETERNUS DX S3 / S4
Assuming that the Host Response in the ETERNUS DX is set to "Active-Active / Preferred Path"
The green LUN1 is assigned to CM#0
CA port of CM#0 is the optimized path
CA port of CM#1 is the non-optimized path
The blue LUN2 is assigned to CM#1
CA port of CM#1 is the optimized path
CA port of CM#0 is the non-optimized path
For both LUNs only the optimized path is being used
However both paths are active but only for one LUN
In case of a path failure the non-optimized path is used for I/O
Application Server
I/O request
ETMPD *1
HBA#0
HBA#1
Active Path
Standby Path
Standby Path
Active Path
CM0-CA
CM0-CA
CM1-CA
CM1-CA
LUN1 *2
LUN2 *2
ETERNUS DX
*1 ETERNUS Multi Path Daemon
*2 The term LUN represents here a mapped volume
ETMP ETERNUS DX S3 / S4
Copyright Fujitsu, Release June 2017
Copyright Fujitsu, Release June 2017

9. ETERNUS Models and its Path Types
Fujitsu Training Documentation
ETERNUS Models and its Path Types
ETMP ETERNUS DX S3 / S4
The following assigned access path configurations are defined in the host response settings
Active-Active / Preferred Path also named Active-Active (Asymmetric)
Active-Active also named Active-Active (Symmetric)
Each RAID Group has an assigned CM (owner of the RAID Group) that handles I/O to this RAID Group and its associated Volumes
Model
Fujitsu recommended Multipath Type
DX60 S2 / DX80 S2 / DX90 S2
Active-Active (Asymmetric) ALUA storage
DX60 S3 / DX100 S3 / DX 200 S3 DX60 S4 / DX100 S4 / DX 200 S4
DX410 S2 / DX440 S2
DX500 S3 / DX600 S3
DX8700 S2
Active-Active (Symmetric)
DX8700 S3 / DX 8900 S3
ETMP ETERNUS DX S3 / S4
Copyright Fujitsu, Release June 2017
Copyright Fujitsu, Release June 2017

10. ETMP within Windows® Environment
The ETERNUS Multipath Driver consists of the following elements
Multipath Driver, which connects the storage system to a Windows server and contains path control functions
Multipath Manager, a GUI that sets and monitors path connection status
Multipath Service, a service function that monitors paths for errors and notifies Multipath Manager when a path error occurs
The Windows® native MPIO service is activated during the installation and is needed by the ETMPD
ETMP ETERNUS DX S3 / S4
Copyright Fujitsu, Release June 2017

11. Supported HBA Connections (1)
All HBAs must be of the same topology type
Example of a two path configuration
Example of a four path configuration
ETMP ETERNUS DX S3 / S4
Copyright Fujitsu, Release June 2017

12. Supported HBA Connections (2)
Fujitsu Training Documentation
Supported HBA Connections (2)
ETMP ETERNUS DX S3 / S4
Example of a two path configuration
With two independent server accesses
Within a cluster configuration and concurrent physical server access
In this case a cluster software is mandatory to control server access
ETMP ETERNUS DX S3 / S4
Copyright Fujitsu, Release June 2017
Copyright Fujitsu, Release June 2017

13. Unsupported HBA Connections
One CA port can be physically access two HBAs of the same server
Zoning or different switches is/are mandatory to guaranty this rule
Two HBAs of the same server can access two different CA ports but on the same CM (no controller redundancy)
Example of a two path configuration
ETMP ETERNUS DX S3 / S4
Copyright Fujitsu, Release June 2017

14. Fujitsu Training Documentation
ETMP ETERNUS DX S3 / S4
Copyright Fujitsu, Release June 2017