1. 腾讯云数据库 Memcached 会自动扩容以保证用户实例始终有20%的可用空间，防止业务因缓存实例不能写入而受损。理论上单个实例没有容量上限。
2. 实例需要扩容时，首先会检查实例当前所在的各个存储机的剩余空间是否满足扩容需求，如果满足则直接原地扩容，否则需要增加额外的存储机。n
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