Modify Local Storage Configuration

After local storage is added, you can edit its name and description, adjust the data storage overcommit ratio, or modify the disk preallocation policy as needed.

Common Entries

You can modify local storage configuration from the following entries:

Go to the target local storage page and click Actions > Edit Name and Description.
Go to the target local storage page, click Actions > Modify Advanced Settings.

Common Operations

Operation Description

Edit Name and Description Modify the name and description of local storage.

Modify Data Storage Overcommit Ratio

Operation	Description
Edit Name and Description	Modify the name and description of local storage.
Modify Data Storage Overcommit Ratio	Controls the allocatable data storage space for virtual machines. Calculation formula: `Data storage allocatable capacity = [(actual capacity - reserved capacity) × overcommit ratio] - (threshold capacity + sum of all volumes allocated to virtual machines + snapshots + image cache + migration cache)`
Modify Disk Preallocation Policy	Sets the disk preallocation policy for data storage. Default: none. none: Does not use a preallocation policy. With this policy, files are dynamically allocated the required space as needed. metadata: Preallocates only the space required for file metadata and does not allocate space for data. With this policy, storage space required for the volume is dynamically allocated as data is written. falloc: Preallocates the required space for the file but does not immediately erase data on the corresponding physical device. Erasure is performed when the virtual machine writes data to the volume for the first time. full: Preallocates the required space for the file.

Controls the allocatable data storage space for virtual machines.

Calculation formula: Data storage allocatable capacity = [(actual capacity - reserved capacity) × overcommit ratio] - (threshold capacity + sum of all volumes allocated to virtual machines + snapshots + image cache + migration cache)

Modify Disk Preallocation Policy

Sets the disk preallocation policy for data storage. Default: none.

none: Does not use a preallocation policy. With this policy, files are dynamically allocated the required space as needed.
metadata: Preallocates only the space required for file metadata and does not allocate space for data. With this policy, storage space required for the volume is dynamically allocated as data is written.
falloc: Preallocates the required space for the file but does not immediately erase data on the corresponding physical device. Erasure is performed when the virtual machine writes data to the volume for the first time.
full: Preallocates the required space for the file.

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