1.2 Problems with traditional storage methods SAN understand from different perspectives,SAN The overall storage space is Shared,但是在SAN The space allocated to the host in the storage space is exclusive.ĭAS直连存储 和 SAN存储区域网络 The bottom layer of the storage method is stored in blocks.SAN Storage is generally commercial storage.SAN Out of the store is exclusive distribution.NAS NAS storage is shared.
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支持跨网络通信,There is a separation between host and storage.Use optical fiber link is more commonly,依附于硬件,Need to install the specific hardwareHDA.SANis used based on 块(similar to hard drive)的方式进行数据共享.The storage method is on a remote storage server,Storage space will be large,Can manage resources and file systems. SCSI 的结构类似于TCP/IP 协议,也有很多层,但是SCSIThe protocol is mainly used to store data operations.Since it is stratified,那就是说,Some layers can be replaced.For example, the physical layer is based on FC 方式来实现,就形成了 FC SAN,如果基于以太网方式来传递数据,就形成了 iSCSI 模式. 基于 SAN way provided to the client operating system is a block device interface,These devices are mainly SCSI protocol to complete normal communication. NAS The general application scenario is shared storage. 支持跨网络通信,There is a separation between host and storage.Is a file on the storage,Cannot manage space resources and file systems,Only use files in storage.Communication takes place in the form of files. Easily deploy distributed storageCeph高可用集群Įither interface,都是存储设备驱动下的磁盘设备,The disk device is actually a storage,This storage is directly connected to the motherboard bus.Ĭross-network communication is not supported,and prone to failure.Īlmost all network storage devices are basically used in a file system style,No further formatting operations are possible