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由 Hao Peng 提交于
At present shared disks can be migrated with either readonly or cache=none. But cache=directsync should be safe for migration, because both cache=directsync and cache=none don't use the host page cache, and cache=direct write through qemu block layer cache. Signed-off-by: NPeng Hao <peng.hao2@zte.com.cn> Reviewed-by: NWang Yechao <wang.yechao255@zte.com.cn>
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