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virt-install: document cache mode 'unsafe' and 'directsync'
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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@ -607,9 +607,12 @@ Path to a disk to use as the backing store for the newly created image.
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=item B<cache>
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The cache mode to be used. The host pagecache provides cache memory.
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The cache value can be 'none', 'writethrough', or 'writeback'.
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The cache value can be 'none', 'writethrough', 'directsync', 'unsafe'
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or 'writeback'.
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'writethrough' provides read caching. 'writeback' provides
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read and write caching.
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read and write caching. 'directsync' bypasses the host page
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cache. 'unsafe' may cache all content and ignore flush requests from
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the guest.
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=item B<discard>
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