IBM System storage DS6000 Series, Руководство по присоединению

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value to the application requirements. For maximum bandwidth, set the
maxphys parameter by adding the following line to the /etc/system file:
set maxphys=1048576 (1 MB)
Note: Do not set the value for maxphys greater than 1048576 (1 MB).
Doing so can cause the system to hang.
Installing the Subsystem Device Driver
This section provides instructions for installing the Subsystem Device Driver.
For procedures about how to install the Subsystem Device Driver (SDD), see IBM
TotalStorage Multipath Subsystem Device Driver User’s Guide . This publication
describes how to use the SDD on open-systems hosts to enhance performance and
availability on the storage unit. The SDD creates redundant paths for shared logical
unit numbers and permits applications to run without interruption when path errors
occur. It balances the workload across paths, and it transparently integrates with
applications. For information about the SDD, go to http://www-
1.ibm.com/servers/storage/support/software/sdd.html.
Attaching a storage unit to a Sun host using Storage Traffic Manager
System
This section provides instructions for attaching a storage unit to a Sun host using
Storage Traffic Manager System.
The Storage Traffic Manager System (STMS) is a multipathing mechanism for
native Sun systems. Using the DS CLI, you can specify Sun - Solaris as port
profile. Using the Storage Manager GUI, you can specify Sun servers (Solaris)
(Sun) as host system when attaching the storage unit to a host operating with
STMS.
See the Sun Web site at http://www.sun.com for up-to-date documentation.
Configuring the Sun STMS host settings
This section provides instructions for configuring the Sun STMS host settings.
1. Type cd /etc to change to the /etc subdirectory.
2. Backup the system file in the subdirectory.
3. Edit the system file and set the following parameters for servers with
configuration that only use Emulex or QLogic adapters:
ssd_io_time
This parameter specifies the time-out value for disk operations. Add the
following line to the /etc/system file to set the ssd_io_time parameter for
the storage unit LUNs:
set ssd:ssd_io_time=0x78
ssd_max_throttle
This ssd_max_throttle parameter specifies the maximum number of
commands that the SSD driver can queue to the host adapter driver.
The default value is 256, but you must set the parameter to a value less
than or equal to a maximum queue depth for each connected LUN.
Determine the value by using the following formula:
256 ÷ (LUNs per adapter)
Chapter 18. Attaching to a Sun host
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