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Oracle® ZFS Storage Appliance Analytics Guide, Release OS8.7.0

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Updated: March 2017

Data Movement: Shadow Migration Requests

This statistic tracks shadow migration 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 currently encompasses both synchronous and asynchronous (background) migration, so it's not possible to view only latency visible to clients.

When to Check Shadow Migration Requests

When investigating Shadow Migration activity.

Shadow Migration Requests Breakdowns

Table 25  Breakdowns of Shadow Migration Requests
The filename that was migrated. Using this breakdown allows hierarchy mode to be used, so that filesystem directories can be navigated.
This shows the project which contains a shadow migration.
This shows the share which is being migrated.
Measure the latency incurred as part of shadow migration.

Further Analysis

Also see Data Movement: Shadow Migration Ops and Data Movement: Shadow Migration Bytes.