# Volume metrics
Your Amazon FSx for NetApp ONTAP file system can have one or more volumes that store your data. Each of these volumes has a set of CloudWatch metrics, classified as either **Volume metrics** or **Detailed volume metrics**.
+ **Volume metrics** are per-volume performance and storage metrics that take two dimensions, `FileSystemId` and `VolumeId`. `FileSystemId` maps to the file system that the volume belongs to.
+ **Detailed volume metrics** are per-storage-tier metrics that measure storage consumption per tier with the `StorageTier` dimension (with possible values of `SSD` and `StandardCapacityPool`) and per data type with the `DataType` dimension (with possible values of `User`, `Snapshot`, and `Other`). These metrics have the `FileSystemId`, `VolumeId`, `StorageTier`, and `DataType` dimensions.
**Topics**
+ [Network I/O metrics](#fsxn-vol-network-IO-metrics)
+ [Storage capacity metrics](#fsxn-vol-storage-volume-metrics)
+ [Detailed volume metrics](#detailed-vol-metrics)
## Network I/O metrics
All of these metrics take two dimensions, `FileSystemId` and `VolumeId`.
| Metric | Description |
| --- | --- |
| DataReadBytes | The number of bytes (network I/O) read from the volume by clients. The `Sum` statistic is the total number of bytes associated with read operations during the specified period. To calculate the average throughput (bytes per second) for a period, divide the `Sum` statistic by the number of seconds in the specified period. Units: Bytes Valid statistics: `Sum` |
| DataWriteBytes | The number of bytes (network I/O) written to the volume by clients. The `Sum` statistic is the total number of bytes associated with write operations during the specified period. To calculate the average throughput (bytes per second) for a period, divide the `Sum` statistic by the number of seconds in the specified period. Units: Bytes Valid statistics: `Sum` |
| DataReadOperations | The number of read operations (network I/O) on the volume by clients. The `Sum` statistic is the total number of read operations during the specified period. To calculate the average read operations per second for a period, divide the `Sum` statistic by the number of seconds in the specified period. Units: Count Valid statistics: `Sum` |
| DataWriteOperations | The number of write operations (network I/O) on the volume by clients. The `Sum` statistic is the total number of write operations during the specified period. To calculate the average write operations per second for a period, divide the `Sum` statistic by the number of seconds in the specified period. Units: Count Valid statistics: `Sum` |
| MetadataOperations | The number of I/O operations (network I/O) from metadata activities by clients to the volume. The `Sum` statistic is the total number of metadata operations during the specified period. To calculate the average metadata operations per second for a period, divide the `Sum` statistic by the number of seconds in the specified period. Units: Count Valid statistics: `Sum` |
| DataReadOperationTime | The sum of total time spent within the volume for read operations (network I/O) from clients accessing data in the volume. The `Sum` statistic is the total number of seconds spent by read operations during the specified period. To calculate the average read latency for a period, divide the `Sum` statistic by the `Sum` of the `DataReadOperations` metric over the same period. Units: Seconds Valid statistics: `Sum` |
| DataWriteOperationTime | The sum of total time spent within the volume for fulfilling write operations (network I/O) from clients accessing data in the volume. The `Sum` statistic is the total number of seconds spent by write operations during the specified period. To calculate the average write latency for a period, divide the `Sum` statistic by the `Sum` of the `DataWriteOperations` metric over the same period. Units: Seconds Valid statistics: `Sum` |
| MetadataOperationTime | The sum of total time spent within the volume for fulfilling metadata operations (network I/O) from clients that are accessing data in the volume. The `Sum` statistic is the total number of seconds spent by read operations during the specified period. To calculate the average latency for a period, divide the `Sum` statistic by the `Sum` of the `MetadataOperations` over the same period. Units: Seconds Valid statistics: `Sum` |
| CapacityPoolReadBytes | The number of bytes read (network I/O) from the volume's capacity pool tier. To ensure data integrity, ONTAP performs a read operation on the capacity pool immediately after performing a write operation. The `Sum` statistic is the total number of bytes read from the volume's capacity pool tier over a specified period. To calculate capacity pool bytes per second, divide the `Sum` statistic by the seconds in a specified period. Units: BytesValid statistics: `Sum` |
| CapacityPoolReadOperations | The number of read operations (network I/O) from the volume's capacity pool tier. This translates to a capacity pool read request. To ensure data integrity, ONTAP performs a read operation on the capacity pool immediately after performing a write operation. The `Sum` statistic is the total number of read operations from the volume's capacity pool tier over a specified period. To calculate capacity pool requests per second, divide the `Sum` statistic by the seconds in a specified period. Units: Count Valid statistics: `Sum` |
| CapacityPoolWriteBytes | The number of bytes written (network I/O) to the volume's capacity pool tier. To ensure data integrity, ONTAP performs a read operation on the capacity pool immediately after performing a write operation. The `Sum` statistic is the total number of bytes written to the volume's capacity pool tier over a specified period. To calculate capacity pool bytes per second, divide the `Sum` statistic by the seconds in a specified period. Units: Bytes Valid statistics: `Sum` |
| CapacityPoolWriteOperations | The number of write operations (network I/O) to the volume from the capacity pool tier. This translates to a write request. To ensure data integrity, ONTAP performs a read operation on the capacity pool immediately after performing a write operation. The `Sum` statistic is the total number of write operations to the volume's capacity pool tier over a specified period. To calculate capacity pool requests per second, divide the `Sum` statistic by the seconds in a specified period. Units: Count Valid statistics: `Sum` |
## Storage capacity metrics
All of these metrics take two dimensions, `FileSystemId` and `VolumeId`.
| Metric | Description |
| --- | --- |
| StorageCapacity | The size of the volume in bytes. Units: Bytes Valid statistics: `Maximum` |
| StorageUsed | The used logical storage capacity of the volume. Units: Bytes Valid statistics: `Average` |
| StorageCapacityUtilization | The storage capacity utilization of the volume. Units: Percent Valid statistics: `Average` |
| FilesUsed | The used files (number of files or inodes) on the volume. Units: Count Valid statistics: `Average` |
| FilesCapacity | The total number of inodes that can be created on the volume. Units: Count Valid statistics: `Maximum` |
## Detailed volume metrics
Detailed volume metrics take more dimensions than volume metrics, enabling more granular measurements of your data. All detailed volume metrics have the dimensions `FileSystemId`, `VolumeId`, `StorageTier`, and `DataType`.
+ The `StorageTier` dimension indicates the storage tier that the metric measures, with possible values of `All`, `SSD`, and `StandardCapacityPool`.
+ The `DataType` dimension indicates the type of data that the metric measures, with possible values of `All`, `User`, `Snapshot`, and `Other`.
The following table defines what the `StorageUsed` metric measures for the listed dimensions.
| Metric | Description |
| --- | --- |
| StorageUsed | The amount of logical space used, in bytes. This metric measures different types of space consumption depending on the dimensions used with this metric. When setting `StorageTier` to `SSD` or `StandardCapacityPool`, and setting `DataType` to `All`, this metric measures the logical space usage for this volume for your SSD and capacity pool tiers, respectively. When setting the `DataType` dimension to `User`, `Snapshot`, or `Other`, and setting `StorageTier` to `All`, this metric measures the logical space usage for each respective type of data. The `Snapshot` data consumption includes the snapshot reserve, which is 5% of the volume's size by default. Units: Bytes Valid statistics: `Average`, `Minimum`, and `Maximum` |
| StorageCapacityUtilization | The percentage of the volume's used physical disk space. Units: Percent Valid statistics: `Maximum` |