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StorView RAID Module
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During normal operations, the StorView server(s) send “check-in” packets every 10 seconds. If three
consecutive check-in packets for a specific StorView server are not received, its devices are flagged and
the StorView server with the lowest serial number or address will take control of those devices.
12.3 StorView Performance Optimization
There are some parameters that can be adjusted on the host HBA and operating system to increase the
performance of StorView. They are HBA Execution Throttle setting and the operating system’s Scatter/
Gather registry setting.
12.3.1 Execution Throttle
To improve general I/O performance by allowing more commands on the fibre bus or the SCSI bus, we
recommend changing your host bus adapter’s execution throttle parameter to 256. Refer to your host
HBA documentation for more information.
12.3.2 Scatter/Gather
(Microsoft Windows Only) To increase general I/O performance by allowing larger data transfers we
recommend editing the “MaximumSGList” parameter in the registry. The recommended hexadecimal
value is “ff.” The path is:
HKEY_LOCAL_MACHINE/System/CurrentControlSet/Services/<name of HBA driver>/
Parameters/Device/
Refer to your Microsoft Windows operating system documentation for more information on editing the
registry and your host HBA adapter documentation.
12.4 Time Out Issues
In many cases to resolve long time out issues, you will need to make adjustments to the SCSI time out
registry values. For the most general cases a timeout value between 60 and 120 seconds should be fine,
however in more heavier workload cases a higher value 240 seconds should be set. For Windows
platforms, the default is 60 seconds:
HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Disk/TimeOutValue
For Linux platforms the default is:
2.6 Kernel = 30 seconds
2.4 Kernel = 60 seconds
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