# Amazon FSx for OpenZFS metrics and dimensions Metrics and dimensions Amazon FSx publishes the metrics described in the following tables in the `AWS/FSx` namespace in Amazon CloudWatch for all FSx for OpenZFS file systems: **Topics** + [ ## FSx for OpenZFS network I/O metrics ](#fsx-networkio-metrics) + [ ## FSx for OpenZFS file server metrics ](#fsx-file-server-metrics) + [ ## FSx for OpenZFS disk metrics ](#fsx-diskio-metrics) + [ ## FSx for OpenZFS storage capacity metrics ](#fsx-storage-capacity-metrics) + [ ## FSx for OpenZFS dimensions ](#fsx-dimensions) ## FSx for OpenZFS network I/O metrics The `AWS/FSx` namespace includes the following network I/O metrics. | Metric | Description | | --- | --- | | DataReadBytes | The number of bytes for read operations for clients that access the file system. Unit: Bytes Valid statistic: `Sum` | | DataWriteBytes | The number of bytes for write operations for clients that access the file system. Unit: Bytes Valid statistic: `Sum` | | DataReadOperations | The number of read operations for clients that access the file system. Unit: Count Valid statistic: `Sum` | | DataWriteOperations | The number of write operations for clients that access the file system. Unit: Count Valid statistic: `Sum` | | ClientConnections | The number of active connections between clients and the file server. Unit: Count Valid statistics: `Average`, `Maximum` | | MetadataOperations | The number of metadata operations for clients that access the file system. Unit: Count Valid statistic: `Sum` | | NfsBadCalls | The number of calls rejected by the NFS server remote procedure call (RPC) mechanism. Unit: Count Valid statistic: `Sum` | ## FSx for OpenZFS file server metrics The `AWS/FSx` namespace includes the following file server metrics. | Metric | Description | | --- | --- | | NetworkThroughputUtilization | The network throughput for clients that access the file system, as a percentage of the provisioned limit. For Multi-AZ file systems, this metric includes replication traffic. Note that this metric reflects the direction - i.e. inbound or outbound - that has the higher traffic flow. Unit: Percent Valid statistics: `Average`, `Maximum` | | CPUUtilization | The percentage utilization of your file server’s CPU resources. Unit: Percent Valid statistics: `Average`, `Maximum` | | FileServerDiskThroughputUtilization | The disk throughput between your file server and its storage volumes. Listed as a percentage of the provisioned limit, which is determined by throughput capacity. Unit: Percent Valid statistics: `Average`, `Maximum` | | FileServerDiskThroughputBalance | The percentage of available burst credits for disk throughput between your file server and its storage volumes. Unit: Percent Valid statistics: `Average`, `Minimum` | | FileServerDiskIopsUtilization | The disk IOPS between your file server and storage volumes, as a percentage of the provisioned limit, which is determined by throughput capacity. Unit: Percent Valid statistics: `Average`, `Maximum` | | FileServerDiskIopsBalance | The percentage of available burst credits for disk IOPS between your file server and its storage volumes. Unit: Percent Valid statistics: `Average`, `Minimum` | | MemoryUtilization | The percentage of your file server’s memory resources that are utilized. Unit: Percent Valid statistics: `Average`, `Maximum` | | FileServerCacheHitRatio | The percentage of cache hits. For Single-AZ 2 (non-HA and HA) file systems, this metric reports the cache hit ratio for both the in-memory (ARC) and NVMe (L2ARC) caches. For Single-AZ 1 (non-HA and HA) file systems, this metric reports only the cache hit ratio for the ARC cache. Unit: Percent Valid statistics: `Average`, `Minimum` | ## FSx for OpenZFS disk metrics The `AWS/FSx` namespace includes the following disk metrics. | Metric | Description | | --- | --- | | DiskReadBytes | The number of bytes for read operations that access storage volumes. Unit: Bytes Valid statistic: `Sum` | | DiskWriteBytes | The number of bytes for write operations that access storage volumes. Unit: Bytes Valid statistic: `Sum` | | DiskReadOperations | The number of read operations for the file server that accesses storage volumes. Unit: Count Valid statistic: `Sum` | | DiskWriteOperations | The number of write operations for the file server that accesses storage volumes. Unit: Count Valid statistic: `Sum` | | DiskThroughputBalance | The percentage of available burst credits for disk throughput for the storage volumes. Unit: Percent Valid statistics: `Average`, `Minimum` | | DiskIopsUtilization | The disk IOPS between your file server and storage volumes, as a percentage of the provisioned IOPS limit that has been determined by the storage volumes. Unit: Percent Valid statistics: `Average`, `Maximum` | ## FSx for OpenZFS storage capacity metrics The `AWS/FSx` namespace includes the following storage capacity metrics. | Metric | Description | | --- | --- | | StorageCapacity | The total storage capacity, equal to the sum of used and available storage capacity. Unit: Bytes Valid statistics: `Average`, `Minimum` | | UsedStorageCapacity | The amount of storage that's used. Unit: Bytes Valid statistics: `Average`, `Minimum` | | CompressionRatio | The ratio of compressed storage usage to uncompressed storage usage. Valid statistics: `Average`, `Minimum` | ## FSx for OpenZFS dimensions FSx for OpenZFS provides additional dimensions to further refine the metrics listed in the previous table. FSx for OpenZFS metrics use the `FSx` namespace and provide metrics at the file system or volume granularity by using the `FileSystemId` or `VolumeId`. | Dimension | Description | | --- | --- | | `FileSystemId` | This dimension filters the metrics that you request to an individual file system. | | `VolumeId` | This dimension filters the metrics that you request to an individual volume within a file system. This dimension must be used in combination with `FileSystemId`. | | `CacheType` | This dimension filters the metrics that you request by the type of cache used, either ARC for in-memory caching or L2ARC for SSD and NVMe caching. This dimension must be used in combination with `FileSystemId`. | | `DataType` | This dimension filters the metrics that you requested to a specific type of stored data. Metrics with `DataType` set to `Snapshot` report information about the snapshots within the volume. Metrics without a `DataType` dimension report aggregated information from the volume, which includes any child volumes and snapshots within the volume. | FSx for OpenZFS metrics use the `FSx` namespace and provide metrics for the dimensions that are listed in the table above.