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2017 Apr 03
1
(Live) Migration safe vs. unsafe
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