.TH ERA_INVALIDATE 8 "Thin Provisioning Tools" "Red Hat, Inc." \" -*- nroff -*-
.SH NAME
era_invalidate \- Provide a list of blocks that have changed since a particular era.

.SH SYNOPSIS
.B era_invalidate
.RB [ options ]
.I {device|file}

.SH DESCRIPTION
.B era_invalidate
Examines era metadata and lists blocks that may have changed since a given era.

This tool cannot be run on live metadata unless the \fB\-\-metadata\-snap\fP option is used.

.SH OPTIONS
.IP "\fB\-h, \-\-help\fP"
Print help and exit.

.IP "\fB\-V, \-\-version\fP"
Output version information and exit.

.IP "\fB\-o <output file>\fP"
Write output to a file rather than
.B stdout
.

.SH EXAMPLE
List the blocks that may have been written since the beginning of era
13 on the metadata device /dev/vg/metadata.
.sp
.B era_invalidate --written-since 13 /dev/vg/metadata

The device may not be actively used by the target
when running.

.SH DIAGNOSTICS
.B era_invalidate
returns an exit code of 0 for success or 1 for error (eg, metadata corruption).

.SH SEE ALSO
.B era_check(8),
.B era_dump(8),
.B era_repair(8),
.B era_restore(8)

.SH AUTHOR
Joe Thornber <ejt@redhat.com>