Mpio PD 100 User's Guide download pdf (Page 18)

addition of host controllers. The software uses a round-robin load-balancing algorithm by

which individual I/O requests are routed to active host controllers in a series one after the

other.

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Queue depth – SCSI storage arrays present storage to a host in the form of a logical unit

number (LUN). LUNs have a nite set of resources available, such as the amount of data that

can be stored, as well as the number of active commands that a device or LUN can process at

one time. The number of active commands that can be issued before a device blocks further

I/O is known as queue depth. When the Sun StorageTek Trac Manager software is

enabled, a single queue is created for each LUN regardless of the number of distinct or

separate paths it may have to the host. This feature enables the disk driver to maintain and

balance one queue to the LUN, eectively managing queue depth. No other multipathing

software available for the Solaris 10 OS has this ability.

■

stmsboot command – The Solaris 10 OS includes the stmsboot(1M) command, which

allows you to enable or disable the Solaris OS Multipathing software on your boot device

after the OS installation has been completed. This command is available for both SPARC

and x86/x64 systems, and provides support for SAS multipathing with the Solaris 10 Update

5 OS.

SAS multipathing is not enabled by default in the Solaris 10 Update 5 OS for either SPARC

or x86/x64 hosts, so use of the stmsboot command is required as a post-installation step if

you wish to enable Multipathing.

SPARC hosts do not enable multipathing for Fibre Channel devices by default, so use of the

stmsboot command is required as a post-installation step.

X86/x64 hosts do enable multipathing of Fibre Channel devices by default, so the use of the

stmsboot command is not mandatory as a post-installation step.

■

Dynamic reconguration – The Sun StorageTek Trac Manager software supports the

Solaris 10 OS dynamic reconguration (DR).

Supported Standards

The Sun StorageTek Trac Manager software is based on open standards for communicating

with devices and device management, ensuring interoperability with other standards-based

devices and software. The following standards are supported by the Sun StorageTek Trac

Manager software:

■

ANSI Standard: Information Technology – SNIA Multipath Management API Specication

(ANSI INCITS 412-2006)

■

T10 standards, including SCSI-3, SAM, FCP, SPC, and SBC

■

T11.3 FC standards, including FC-PH, FC-AL, FC-LS, and FC-GS

■

T11.5 storage management standards, including FC-HBA

■

IETF standards, including RFC 2625

Supported Standards

Solaris SAN Conguration and Multipathing Guide • April 200918

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