# Physical Drives Command Center provides extensive cloud physical drive management functionality. Using Command Center, a Zadara Cloud administrator can easily perform activities such as : - Drive inventory management - Drive validation and failure management - Assignment of Drives to specific Quality of Service groups ## Viewing Physical Drive Inventory Command Center displays the overall Drive inventory in the **Drives** view.  The Drive inventory is primarily grouped by Drive model, and displays detailed utilization per group.  | **Status** | **Description** | |--------------|------------------------------------------------------------------| | Total | Number of Drives from the specific model available in this cloud | | Disabled | Drives that the cloud admin set as disabled | | Absent | Drives that are physically unavailable (taken out of their bay) | | Used | Drives that are actively assigned to a VPSA instance | | Free | Drives that are not assigned to any VPSA instance | ## Viewing Drive Properties In the Command Center’s **Drives** view, select the Drive Group to which the required Drive belongs. After the list of group members appears, select the required Drive. ### Drive Properties  | **Property** | **Description** | |----------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | Device Name | Device file identifier for the Drive | | Drive Type | Drive model | | Capacity | Physical capacity (GiB) of the Drive

**Note:** SSD Cache Drives also present the capacity of allocated partitions | | License | Indicates whether the Drive is licensed on the cloud level | | Status | Indicates the current status of the Drive. Possible values:

* **Available**: The drive is ready for use and can be allocated
* **Disabled**: An unassigned available drive has been removed from availability
* **Allocated**: The drive is assigned to a VPSA
* **Allocated (Disabled)**: The drive is assigned to a VPSA, but disabled
* **Normal**: The drive is functioning correctly
* **Failed**: The drive is not responding
* **Replaced**: The drive data has been moved to another drive | | Address | Storage Node SCSI address for the specified Drive | | PCI Address | Storage Node PCI address for the specified Drive | | Address | Storage Node SCSI address for the specified Drive | | PCI Address | Storage Node PCI address for the specified Drive | | Product ID | Product ID for the Drive | | Firmware Version | Firmware Version of the Drive | | Serial Number | Serial Number of the Drive | | UUID | Linux UUID for the Storage Node Device | | Cache | Whether the Drive is being used as SSD Cache | | Location | Storage Node and MegaRaid location identifier for the Drive
(Adapter ID/Enclosure ID/Slot) | | Adapter Cache Policy | MegaRaid Adapter Cache Policy:

* **Write Back**: Adapter write buffering
* **Read Ahead**: Adapter read prefetching | ### Volume Properties  | **property** | **Description** | |----------------|--------------------------------------------------------| | ID | Volume Identifier | | VPSA | VPSA/Object Storage to which this volume is allocated | | Drive | Device file name for the Storage Node Physical Drive | | Size | Volume Capacity | | Cache | Whether this volume is used as a GEN2 SSD Cache device | | Storage Node | Storage Node in which this volume is defined | | Replace Volume | Toggle Drive replacement for this volume | ## Performing Operations On Physical Drives To view all operations that can be performed on a specific Drive: 1. From the **Drives** view, select the appropriate Drive Group and go to the **Drives** tab. 2. Click the required Physical Drive. 3. In the Drive’s **Details** panel on its **Dashboard** tab, click **Actions** to display the dropdown listing the possible operations for the Drive.  ### Disabling a Drive 1. From the Drive’s **Actions** dropdown, select **Disable**. 2. In the **Disable Drive** dialog, click **Disable** to confirm disabling the Drive. After the operation is complete, the Drive’s Status change to **Disabled**. ### Enabling a Drive 1. Select a disabled Physical Drive. 2. In the **Enable Drive** dialog, click **Enable** to confirm enabling the Drive. After the operation is complete, the Drive’s Status change to **Enabled**. ### Managing Drive LED A Physical Drive LED can be turned on or off in Command Center. To manage a Physical Drive LED: 1. From the Drive’s **Actions** dropdown, select **LED On** or **LED Off**. 2. In the **Enable Drive LED** or **Disable Drive LED** dialog, click **Confirm** to confirm enabling or disabling the Drive LED. ### Viewing Drive SMART Attributes To view a Drive’s SMART attributes: 1. From the **Drives** view, select the appropriate Drive Group and go to its **Drives** tab. 2. Click the required Physical Drive. 3. In the Drive’s **Dashboard** tab, in the **Details** panel, click **Actions** and from the dropdown select **SMART Attributes**. The **SMART Attributes** dialog displays the Drive’s SMART attributes. ### Designating SSD Drive as Cache SSD Drives installed in the cloud can be designated as Cache Drives for use in hybrid VPSA configurations. 1. From the Drive’s **Actions** dropdown, select **Designate as Cache**. 2. The **Confirm Drive Change** dialog displays warning information that the Drive will no longer be available for user storage. Click **Confirm** to confirm designating the Drive as Cache. After the operation is complete, the Drive Type will change to **SSD CACHE DRIVES**. ### Undesignating SSD Drive as Cache An SSD Drive that is designated as a Cache Drive can be undesignated, to serve as regular drive for user storage. 1. From the Drive’s **Actions** dropdown, select **Undesignate as Cache**. 2. In the **Confirm Drive Change** dialog click **Confirm** to confirm undesignating the Drive as Cache. After the operation is complete, the Drive Type will change to its native SSD Drive Type. ### Removing Drives The cloud administrator can initiate an orderly removal of Physical Drives from the cloud via Command Center. To start the removal process, select **Offline and Remove** from the Drive’s **Actions** dropdown. ### Unlicensing a Drive 1. From the Drive’s **Actions** dropdown, select **Unlicense**. 2. In the **Unlicense Drive** dialog, click **Confirm** to confirm unlicensing the Drive. After the operation is complete, the Drive Type will change to **Unlicensed**. ## Monitoring Drive Performance To view performance statistics for a specific Drive: 1. From the **Drives** view, select the appropriate Drive Group and go to the **Drives** tab. 2. Click the required Physical Drive. 3. Go to the **Performance** tab that displays the Drive’s performance statistics: * Average IO rate displayed as read vs. write IOs * Average IO time displayed as read vs. write IOs * Average Bandwidth displayed as read vs. write activity  The monitoring interval can be changed. Supported monitoring intervals: * 1 seconds * 10 seconds * 1 minute * 1 hour * 1 day Click the **Auto-Refresh** toggle to activate or disable the automatic display of updated monitoring data on reaching the monitoring interval.