[cache_writeback] stub cache_writeback

man8/cache_writeback.8

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+.TH CACHE_WRITEBACK 8 "Thin Provisioning Tools" "Red Hat, Inc." \" -*- nroff -*-
+.SH NAME
+cache_writeback \- writeback dirty blocks to the origin device.
+
+.SH SYNOPSIS
+.B cache_writeback
+.RB [ options ]
+.RB --metadata-device
+.I {device|file}
+.RB --origin-device
+.I {device|file}
+.RB --fast-device
+.I {device|file}
+
+.SH DESCRIPTION
+.B cache_writeback
+
+An offline tool that writesback dirty data to the data device
+(origin).  Intended for use in recovery scenarios when the SSD is
+giving IO errors.
+
+This tool cannot be run on a live cache.
+
+.SH OPTIONS
+
+.IP "\fB\\-\-metadata\-device\fP \fI{device|file}\fP"
+Location of cache metadata.
+
+.IP "\fB\-\-origin\-device\fP \fI{device|file}\fP"
+Slow device being cached.
+
+.IP "\fB\-\-fast\-device\fP \fI{device|file}\fP"
+Fast device containing the data that needs to be written back.
+
+.IP "\fB\-\-skip\-metadata\-update\fP"
+Do not update the metadata to clear the dirty flags for written back
+data.  You may not want to do this if you're decommissioning the
+cache.
+
+.IP "\fB\-h, \-\-help\fP"
+Print help and exit.
+
+.IP "\fB\-V, \-\-version\fP"
+Output version information and exit.
+
+.SH SEE ALSO
+.B cache_dump(8)
+.B cache_check(8)
+.B cache_repair(8)
+.B cache_restore(8)
+
+.SH AUTHOR
+Joe Thornber <ejt@redhat.com>