Table of ContentsView in Frames

Running efficiency operations manually

You can run efficiency operations manually on a FlexVol volume by using the sis start command.

Before you begin

Depending on the efficiency operation you want to run manually, you must have enabled deduplication or both data compression and deduplication.

About this task

If only deduplication is enabled on a volume, then deduplication runs on the data. However, if deduplication and data compression are enabled on a volume, data compression is run initially followed by deduplication.

Deduplication is a background process that consumes system resources while it is running. If the data does not change often in a volume, it is best to run deduplication less frequently. Multiple concurrent deduplication operations running on a storage system lead to a higher consumption of system resources.

You can run a maximum of eight concurrent deduplication or data compression operations per node. If any more efficiency operations are scheduled, the operations are queued.

Step

  1. Run an efficiency operation by entering the following command: sis start [-s [-m][-o][-p]] [-f] [-d] [-q] path
    The -s option is used to scan the data that existed in the volume prior to enabling deduplication. You are prompted to confirm whether deduplication or data compression, if enabled, should be started on the volume.
    The -m option can be used to scan the existing data, generate deduplication metadata, and skip sharing. This option is used only with -s option.
    The -o option can be used to scan the existing data and skip shared block optimization. This option is used only with -s option.
    The -p enables the efficiency operation to use the previous checkpoint. This option is used only with -s option.
    The -f option can be used to start the efficiency operation without any prompts.
    The -d starts a new efficiency operation after deleting the previous checkpoint.
    The -q option queues the efficiency operation.
    path is the complete path to the volume.

Examples

The following command allows you to manually start only deduplication or data compression followed by deduplication on the volume VolA:sis start /vol/VolA

The following command allows you to manually run the efficiency operations on the existing data in the volume VolA:sis start -s /vol/VolA