一.概述 zone: 包含多个RGW实例的一个逻辑概念.zone不能跨集群,同一个zone的数据保存在同一组pool中: zonegroup:一个zonegroup如果包含一个或多个zone,如果包含多zone时,必须指定其中一个zone为master zone,用来处理bucket和用户的创建. 一个集群可以创建多个zonegroup, 一个zonegroup可以跨多个集群. realm: 一个realm包含一个或多个zonegroup. 如果realm包含多个zonegroup,必须指定一个…

jewel版本新增加了一个驱动NBD,允许librbd实现一个内核级别的rbd NBD相比较于kernel rbd: rbd-ko是根据内核主线走的,升级kernel rbd需要升级到相应的内核,改动太大 rbd-ko的开发要慢于librbd,需要很多的时间才能追赶上librbd rbd-nbd是通过librbd这个用户空间通过nbd的内核模块实现了内核级别的驱动,稳定性和性能都有保障 怎么理解用户态和内核态? librbd就是用户态,一般的kvm对接的就是librbd的 kernel rbd就…

multisite是ceph rgw对象数据异地容灾备份的一个有效方案,笔者希望深入理解该技术,并应用于生产环境中,然而rgw的这部分代码晦涩难懂,笔者多次尝试阅读,仍云里雾里不解其意,最终流着泪咬着牙坚持多看了几遍,总结出了data sync的流程,这里以通俗易懂的形式呈现出来,希望对大家有所帮助~ 数据同步流程图 https://www.cnblogs.com/wangmingshuai/articles/11040979.html   首先,认识下 data sync机制 的三个角色Dat…

发现身边很多程序员都能看懂英文技术文章的60%-80%内容,但大家都有一个毛病,就是不会说,不会写作,在逛英文技术社区的时候,想发表点什么评论,总担心自己写的话有错误.究其原因, 我觉得主要原因是因为平时生活中用得少.新概念英语第一册到第三册看似虽然简单,一篇课文貌似看下来几乎没有生词,而且都能看懂:但如果要你写这样简单的文章,你能和写中文一样写出来吗?或用英语讲一个这样的故事,你能流利的讲好它吗?如果不能,就和我一起从简单开始坚持学习新概念英语吧,每天背一篇,你在面试填写个人信息的时候,就可以…

新概念英语(1-47)A cup of coffee How does Ann like her coffee? A:Do you like coffee, Ann? B:Yes, I do. A:Do you want a cup? B:Yes, please, Christine. A:Do you want any sugar? B:Yes, please. A:Do you want any milk? B:No, thank you.I don't like milk in my co…

新概念英语(1-45)The boss's letter Why can't Pamela type the letter? A:Can you come here a minute, please, Bob? B:Yes, sir? A:Where's Pamela? B:She is next door. She is in her office,sir. A:Can she type this letter for me? Ask her please. B:Yes, sir. A:Can…

新概念英语(1-43)Hurry up! How do you know Sam doesn't make the tea very often? A:Can you make the tea, Sam? B:Yes, of course I can, Penny. A:Is there any water in this kettle? B:Yes, there is. A:Where is the tea? B:It's over there, behind the teapot. A:Ca…

新概念英语(1-41)Penny's bag Who is the tin of tobacco for? A:Is that bag heavy, Penny? B:Not very. A:Here! B:Put it on this chair. A:What's in it? B:A piece of cheese.(一块奶酪) A loaf of bread.(一條麵包; 一块未切好的面包; 一只面包) A bar of soap.(一块肥皂) A bar of chocolate. A…

新概念英语(1-39)Don't drop it! Where does Sam put the vase in the end ? A:What are you going to do with that vase, Penny ? B:I am going to put it on this table, Sam. A:Don't do that. Give it to me. B:What are you going to do with it? A:I am going to put i…

新概念英语(1-35)Our village Are the children coming out of the park or going into it ? This is a photograph of our village. Our village is in a valley. It is between two hills. The village is on a river. Here is another picture of our village. My wife and…