linux添加磁盘分区做为swap分区

在部署oracle时，根据内存的不同，会对swap分区大小有不同要求，具体参考https://www.cnblogs.com/chxmtl/p/11672053.html

下面为具体操作步骤。

1、新增新分区

查看是否有磁盘未分区，然后进行分区。

[root@dxt ~]# fdisk -l

发现有sdb未分区

[root@dxt ~]# fdisk /dev/sdb

对sdb进行分区，操作步骤如下

[root@dxt ~]# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x4a7f3ba0.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table  will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): n
Command action
   e   extended
   p   primary partition (-)
p
Partition number (-):
First cylinder (-, default ):
Using default value
Last cylinder, +cylinders or +size{K,M,G} (-, default ): +16G

Command (m for help): t
Selected partition
Hex code (type L to list codes): l

   Empty             NEC DOS           Minix / old Lin bf  Solaris
   FAT12             Plan             Linux swap / So c1  DRDOS/sec (FAT-
   XENIX root      3c  PartitionMagic    Linux           c4  DRDOS/sec (FAT-
   XENIX usr         Venix        OS/ hidden C:  c6  DRDOS/sec (FAT-
   FAT16 <32M        PPC PReP Boot     Linux extended  c7  Syrinx
   Extended          SFS               NTFS volume set da  Non-FS data
   FAT16           4d  QNX4.x            NTFS volume set db  CP/M / CTOS / .
   HPFS/NTFS       4e  QNX4.x 2nd part   Linux plaintext de  Dell Utility
   AIX             4f  QNX4.x 3rd part 8e  Linux LVM       df  BootIt
   AIX bootable      OnTrack DM        Amoeba          e1  DOS access
 a  OS/ Boot Manag   OnTrack DM6 Aux   Amoeba BBT      e3  DOS R/O
 b  W95 FAT32         CP/M            9f  BSD/OS          e4  SpeedStor
 c  W95 FAT32 (LBA)   OnTrack DM6 Aux a0  IBM Thinkpad hi eb  BeOS fs
 e  W95 FAT16 (LBA)   OnTrackDM6      a5  FreeBSD         ee  GPT
 f  W95 Ext'd (LBA) 55  EZ-Drive        a6  OpenBSD         ef  EFI (FAT-12/16/
  OPUS              Golden Bow      a7  NeXTSTEP        f0  Linux/PA-RISC b
  Hidden FAT12    5c  Priam Edisk     a8  Darwin UFS      f1  SpeedStor
  Compaq diagnost   SpeedStor       a9  NetBSD          f4  SpeedStor
  Hidden FAT16 <   GNU HURD or Sys ab  Darwin boot     f2  DOS secondary
  Hidden FAT16      Novell Netware  af  HFS / HFS+      fb  VMware VMFS
  Hidden HPFS/NTF   Novell Netware  b7  BSDI fs         fc  VMware VMKCORE
  AST SmartSleep    DiskSecure Mult b8  BSDI swap       fd  Linux raid auto
1b  Hidden W95 FAT3   PC/IX           bb  Boot Wizard hid fe  LANstep
1c  Hidden W95 FAT3   Old Minix       be  Solaris boot    ff  BBT
1e  Hidden W95 FAT1
Hex code (type L to list codes):
Changed system type of partition  to  (Linux swap / Solaris)

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

2、格式化swap分区，并挂载。

[root@dxt ~]# mkswap /dev/sdb1
Setting up swapspace version , size =  KiB
no label, UUID=6a0d8f95-d2a6-419f-b984-306cea28886a
[root@dxt ~]# swapon /dev/sdb1

3、配置开机自动挂载

[root@dxt ~]# vi /etc/fstab