Silicon Graphics InfiniteStorage 4000 Series User Manual page 30

Parameter Name
NotReadyWaitTime
BusyWaitTime
QuiescenceWaitTime Linux: 270
ControllerIoWait
Time
ArrayIoWaitTime
22
known as a wait time. If the NotReadyWaitTime value, the BusyWaitTime
value, and the QuiescenceWaitTime value are greater than the
ControllerIoWaitTime value, they will have no effect.
For the Linux OS, the configuration settings can be found in the /etc/mpp.conf
file. For the Windows OS, the configuration settings can be found in the Registry
under:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\<DSM_Driver>
In the preceding setting, <DSM_Driver> is the name of the OEM-specific driver.
The default Windows driver is named mppdsm.sys. Any changes to the settings
take effect the next time the host is restarted.
ATTENTION Possible loss of data access – If you change these settings from their
configured values, you might lose access to the storage array.
Table 2 Configuration Settings for the Path Congestion Detection Feature
Default Values
Linux: 270 The time, in seconds, a Not Ready condition (SK 0x06, ASC/ASCQ
0x04/0x01) is allowed before failover is performed.
Windows: NA
Valid values range from 0x1 to 0xFFFFFFFF.
Linux: 270 The time, in seconds, a Busy condition is allowed before a failover is
performed.
Windows: NA
Valid values range from 0x1 to 0xFFFFFFFF.
The time, in seconds, a Busy condition is allowed before a failover is
performed.
Windows: NA
Valid values range from 0x1 to 0xFFFFFFFF.
Linux: 120 Provides an upper-bound limit, in seconds, that an I/O is retried on a
controller regardless of the retry status before a failover is performed.
Windows: NA
If the limit is exceeded on the alternate controller, the I/O is again
attempted on the original controller. This process continues until the
value of the ArrayIoWaitTime limit is reached.
Valid values range from 0x1 to 0xFFFFFFFF.
Linux RDAC: 600 Provides an upper-bound limit, in seconds, that an I/O is retried to the
storage array regardless of to which controller the request is
Windows DSM: 600
attempted. After this limit is exceeded, the I/O is returned with a
failure status.
Valid values range from 0x1 to 0xFFFFFFFF.
Description
Wait Time Settings