Introduction to the 'sg_persist' Command

sg_persist Command

Introduction to the Command

The sg_persist command is used to retrieve and set SCSI device persistent reservations. The command is part of the sg3_utils package and allows users to easily manage persistent reservations on SCSI devices.

Basic Usage and Syntax

The basic syntax for the sg_persist command is:

sg_persist [OPTIONS] [DEVICE]

The options are used to specify the type of persistent reservation operation and the device is the SCSI device to be managed.

Examples of Common Use Cases

The sg_persist command can be used to:

• Retrieve the current persistent reservations on a device
• Set a new persistent reservation
• Modify an existing persistent reservation
• Delete an existing persistent reservation

Advanced Options and Flags

The sg_persist command has the following options and flags:

• -d, --delete: Delete a persistent reservation
• -g, --get: Retrieve the current persistent reservations on a device
• -s, --set: Set a new persistent reservation
• -m, --modify: Modify an existing persistent reservation
• -t, --type: Specify the type of persistent reservation to create or modify
• -i, --initiator: Specify the initiator for the persistent reservation
• -r, --reservation-key: Specify the reservation key for the persistent reservation
• -v, --verbose: Increase the verbosity of the output
• -h, --help: Display help

Examples in Real-World Scenarios

The sg_persist command is often used in the following scenarios:

• Creating a persistent reservation for a device in a clustered environment
• Modifying an existing persistent reservation to add an additional initiator
• Deleting an existing persistent reservation
• Retrieving the current persistent reservations on a device

Troubleshooting Tips and Potential Errors

When using the sg_persist command, it is important to be aware of potential errors and troubleshoot them accordingly. Common errors include:

• Invalid device: This error occurs when the specified device is not a valid SCSI device.
• Invalid option: This error occurs when an invalid option is specified.
• Permission denied: This error occurs when the user does not have sufficient permissions to run the command.
• Invalid reservation key: This error occurs when an invalid reservation key is specified.

It is important to ensure that the device, options, and reservation key are all valid before running the command.