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Oracle® ZFS Storage Appliance Administration Guide
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Document Information

Using This Documentation

Chapter 1 Oracle ZFS Storage Appliance Overview

Chapter 2 Status

Chapter 3 Initial Configuration

Chapter 4 Network Configuration

Chapter 5 Storage Configuration

Chapter 6 Storage Area Network Configuration

Chapter 7 User Configuration

Chapter 8 Setting ZFSSA Preferences

Chapter 9 Alert Configuration

Chapter 10 Cluster Configuration

Chapter 11 ZFSSA Services

Chapter 12 Shares, Projects, and Schema

Chapter 13 Replication

Chapter 14 Shadow Migration

Data Migration

Traditional Data Migration

Migration via Synchronization

Migration via External Interposition

Shadow Migration

Shadow migration behavior

Restrictions on Shadow Source

Shadow File System Semantics During Migration

Identity and ACL Migration

Shadow Migration Management

Creating a Shadow Filesystem

Managing Background Migration

Handling Migration Errors

Monitoring Migration Progress

Canceling Migration

Snapshots of Shadow File Systems

Backing Up Shadow File Systems

Replicating Shadow File Systems

Shadow Migration Analytics

Shadow Migration Requests

Shadow Migration Bytes

Shadow migration operations

Migrating Local File Systems

Shadow Migration Tasks

Testing Potential Shadow Migration

Migrating Data from an Active NFS Server

Chapter 15 CLI Scripting

Chapter 16 Maintenance Workflows

Chapter 17 Integration


Shadow Migration Analytics

In addition to standard monitoring on a per-share basis, it's also possible to monitor shadow migration system-wide through Analytics in Oracle ZFS Storage Appliance Analytics Guide . The shadow migration analytics are available under the "Data Movement" category. There are two basic statistics available:

Shadow Migration Requests

This statistic tracks requests for files or directories that are not cached and known to be local to the filesystem. It does account for both migrated and unmigrated files and directories, and can be used to track the latency incurred as part of shadow migration, as well as track the progress of background migration. It can be broken down by file, share, project, or latency. It currently encompasses both synchronous and asynchronous (background) migration, so it's not possible to view only latency visible to clients.

Shadow Migration Bytes

This statistic tracks bytes transferred as part of migrating file or directory contents. This does not apply to metadata (extended attributes, ACLs, etc). It gives a rough approximation of the data transferred, but source datasets with a large amount of metadata will show a disproportionally small bandwidth. The complete bandwidth can be observed by looking at network analytics. This statistic can be broken down by local filename, share, or project.

Shadow migration operations

This statistic tracks operations that require going to the source filesystem. This can be used to track the latency of requests from the shadow migration source. It can be broken down by file, share, project, or latency.