61 lines
1.4 KiB
Groff
61 lines
1.4 KiB
Groff
.TH CACHE_WRITEBACK 8 "Thin Provisioning Tools" "Red Hat, Inc." \" -*- nroff -*-
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.SH NAME
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cache_writeback \- writeback dirty blocks to the origin device.
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.SH SYNOPSIS
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.B cache_writeback
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.RB [ options ]
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.RB --metadata-device
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.I {device|file}
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.RB --origin-device
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.I {device|file}
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.RB --fast-device
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.I {device|file}
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.SH DESCRIPTION
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.B cache_writeback
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An offline tool that writesback dirty data to the data device
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(origin). Intended for use in recovery scenarios when the SSD is
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giving IO errors.
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This tool cannot be run on a live cache.
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.SH OPTIONS
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.IP "\fB\\-\-metadata\-device\fP \fI{device|file}\fP"
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Location of cache metadata.
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.IP "\fB\-\-origin\-device\fP \fI{device|file}\fP"
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Slow device being cached.
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.IP "\fB\-\-fast\-device\fP \fI{device|file}\fP"
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Fast device containing the data that needs to be written back.
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.IP "\fB\-\-no\-metadata\-update\fP"
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Do not update the metadata to clear the dirty flags for written back
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data. You may not want to do this if you're decommissioning the
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cache.
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.IP "\fB\-\-buffer\-size\-meg \fI{size}\fP"
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Specify the size for the metadata cache. Defaults to 16 Gig, a larger size may
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improve performance.
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.IP "\fB\-\-list\-failed\-blocks\fP
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List any blocks that failed the writeback process.
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.IP "\fB\-h, \-\-help\fP"
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Print help and exit.
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.IP "\fB\-V, \-\-version\fP"
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Output version information and exit.
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.SH SEE ALSO
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.B cache_dump(8)
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.B cache_check(8)
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.B cache_repair(8)
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.B cache_restore(8)
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.SH AUTHOR
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Joe Thornber <ejt@redhat.com>
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