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StorageTek Virtual Storage Manager System 6 (VSM6)
 

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Goal

Solution

References

Oracle Confidential PARTNER - Available to partners (SUN).
Reason: partner and internal Oracle only
Created from <SR 3-12879398462>

Applies to:

Goal

Determine the use of the CLI MIH setting

Understand what the CLI MIH setting does

Solution

From the 6.3 documentation VSM 6 Installation, Configuration, and Service Guide, the following set mih Command Line Interface (CLI) command was an added feature starting with version 6.3.  This value is utilized by Enhanced Replication (synchronous replication) and CLINKs (synchronous replication).  Prior to VSM 6.3, an I/O operation was internally timed out in the VSM6 if it did not complete in 40 minutes, regardless of the host Missing Interrupt Handler (MIH) setting. It was recommended to set the host MIH value to 45 minutes.

The implementation of the CLI "set mih" command added in 6.3.0.05.000 and above allows each VSM VTSS to override the default 45 minute value to a value between 20 and 45 minutes. Additionally, this value is provided back to the host when the host issues an RCD (Read Configuration Data) operation which the host can then use to override the host's default value MIH setting for this device.

This command sets the replication timeout value in minutes. The default is 45 minutes.

Syntax:

set mih -tv value

Parameters:

This command has one required parameter:

-tv

The timeout value in minutes. Valid values are from 20 to 45. By default the value is set to 45.

Note - The MIH setting does not apply to Asynchronous Replication.  The timeout value for this type of replication is 60 minutes.  In 7.0.0.07.000 and higher, there is no timeout for slow Asynchornous Replication transfers and the 60 minute timeout does not apply as in previous versions of code.  A timeout for Asynchronous Replication is still possible if no progress in replication transfers are being made.

References

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