Add a new hard drive to a Linux server

The lack of existing hard disk capacity often haunts the Linux http://www.aliyun.com/zixun/aggregation/13879.html "> system administrator, the most common reason is the ever-expanding number of data and increasing numbers of users, as well as before finding replacements Linux servers must also perform a number of tasks properly.

This article describes how to add a hard disk to a Linux system in two ways. The first way is to move a folder from a full partition to another empty partition, and then link the folder directory to a two-piece hard disk. Alternatively, use the Linux logical Partition Manager (LVM) to merge several partitions into one partition.

On some occasions you will encounter problems adding a new hard drive to a Linux server, perhaps because the existing hard drive is broken or there is no room. To provide more space, this section will tell you how to add a hard disk with only one partition and how to transfer data from a full hard drive to a new hard disk.

Some folders are always crowded: even if you delete all the unwanted data, the Var partition is still full, and you need to add a new hard drive to the system. You can verify by calling command DF, which shows that the other partitions are full and cannot accept new data.

Refer to Manufacturer's instructions the new hard drive can be added to the system, but you need to know how to do it.

Determine the type of hard disk

Linux stores the names of all known hard disk partitions in the/proc/partitons file. A mirror with a secondary number of 0 for the entire hard disk indicates that all partitions on the hard disk are sorted from 1 to the beginning. In the following example, the system has two hard drives, the hard drive/dev/hda has been divided, and the new hard disk (/DEV/HDB) needs to be set up to receive data.

Note: The naming of Linux hard disk devices follows certain standards. The SCSI hard disk starts with the SD and the IDE hard disk begins with HD, and then a single hard drive is determined by one letter, for example, the first hard drive is a, the second is B and the third is C and so on. Finally, a two-digit number determines the partition number. The fifth partition of the fourth IDE drive using this rule should be/dev/hdd5.