(Live) Migration safe vs. unsafe

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Hi all,

virsh checks whether a (live) migration is safe or unsafe. When a
migration is considered to be unsafe it is rejected unless the --unsafe
option is prodivided.

As a part of those checks virsh considers the cache settings for the
underlying storage resources. In this context only cache="none" is
considered to be safe.

I wonder why cache="directsync" might be harmfull as it bypasses the
host page cache completely.

Regards,

Michael

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