最近公司服务器突然出现问题，导致软件工作停滞，于是本人就干起了网管的工作，决定去摸索一下，到底哪里出了问题，这里就分享一下个人的心路历程，希望对大家有用。
ubuntu 服务器无法编译软件，一直报filesystem 错误，首先想到的是重启系统，但是重启系统就进不去桌面了，只能进入命令模式了，由于服务器是由一个2T 系统盘，加上8个2T 组成的raid 6阵列，一个6T 的硬盘，只能心里祈祷raid 6 的阵列不能坏，因为raid6 的阵列完全不会搞。
在命令模式里输入：df - h (查看硬盘是否挂载)，如下图：
sda1 ,sdi, md0（阵列）都已经在挂载的，但是为什么进不了系统，这就要对各个盘进行检测，在命令行里输入 sudo fdisk -l 查看坏的ubuntu 系统分区，这里我查看的正是 /dev/sda1 有问题，如何修复： 在命令行里输入 sudo fsck /dev/sda1 ，系统会自动修复sda1 ,修复完会出现success ，之后 reboot ，就可以进入系统，再用fdisk -l 就会显示各个硬盘显示正常：
Disk /dev/sda: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0006fbfe
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 3772966911 3772964864 1.8T 83 Linux
/dev/sda2 3772968958 3907028991 134060034 63.9G 5 Extended
/dev/sda5 3772968960 3907028991 134060032 63.9G 82 Linux swap / Solaris
Disk /dev/sdb: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdc: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdd: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sde: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/md0: 9.1 TiB, 10001323130880 bytes, 19533834240 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 2621440 bytes
Disk /dev/sdf: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdg: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdh: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdi: 5.5 TiB, 6001175126016 bytes, 11721045168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes