Operation and Maintenance
Linux Operation and Maintenance
Introducing Linux disk redundant array example tutorial
Introducing Linux disk redundant array example tutorial
RAID防止硬盘物理损坏以及增加存储设备的吞吐量，RAID常见的组合有0、1、5、和10 RAID0:至少需要两块硬盘，可以有效提高硬盘的性能和吞吐量，但没有数据的冗余和错误修复能力 将多块硬盘通过硬件或软件的方式串联在一起，成为一个大的卷集，将数据依次写到各个硬盘中，这样性能会极大提升， 但若任意一块硬盘故障则整个系统的数据都会受到破坏！ RAID1:需要至少两块硬盘，可以有效的提高数据资料的安全性和可修复性，但成本却高了 在数据写入硬盘时也会在另一个闲置的硬盘上生成镜像文件，在不影响性能的情况下最大限度保证数据资料的可靠性，只 要在在一对镜像盘中还有一块硬盘可以使用，那么数据也不会丢失，拥有很好的硬盘冗余能力，但磁盘利用率仅为50% RAID5:需要至少三块硬盘，兼顾性能，数据安全和存储成本 每个磁盘上使用“parity”块来保存其他硬盘数据的奇偶校验信息（并非其他硬盘上的数据），以数据的奇偶校验信息来 保证数据的安全 RAID10:需要至少四块硬盘，兼具速度和安全性，但成本很高 继承了RAID0的快速与RAID1的安全，RAID1与RAID0的组合，四个硬盘两两以RAID1形成冗余阵列，再将两个RAID1以RAID0形 成读写阵列！成本高！一般用于存放要求速度与差错控制的数据 mdadm命令: -a检测设备名称 -n指定设备数量 -l指定raid级别 -C创建 -v显示过程 -f模拟设备损坏 -r移除设备 -a添加设备 -Q查看摘要信息 -D查看详细信息 -S停止阵列 [root@dagege dev]# mdadm -Cv /dev/md0 -n 5 -l 10 /dev/sdb /dev/sdc /dev/sdd /dev/sde #创建RAID10阵列，使用四个硬盘组成，允许一组RAID1中有一个故障盘而不影响使用 [root@dagege dev]# mdadm -Cv /dev/md0 -n 3 -l 5 -x 1 /dev/sdb /dev/sdc /dev/sdd /dev/sde #创建RAID5阵列，使用三个硬盘，剩余一个作为备份盘，当其中有一个出现故障时自动顶替上去
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