Resize the shadow disk when the size of the source disk changes #2152
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Когда происходит изменение диска нужно изменить и размер теневого диска тоже, чтобы если в этот момент идет миграция, то записи пользователей могли проходить, а не падать с ошибкой E_ARGUMENT, что приводит к поломке NRD и залипанию mirror-диска.
Т.е. фикс чинит проблему, когда пользователь изменил размер диска в процессе создания снимка.