21, Disk Management-linux add swap swap partition

Add swap swap partition

Swap-swap is a function similar to the virtual memory of Windows system, the use of a portion of the hard disk space virtual into memory, so as to solve the situation of insufficient memory capacity, because swap is a hard disk resource virtual, so faster than real physical memory is much slower, Swap is typically called only when real physical memory is exhausted.

t :

command (M for  help ): T 
 Selected partition  1  
  

l :

hex code (type  l  to list  All Codes): l  
 0 Empty NEC DOS bayi minix/o LD Lin BF Solaris 
 1 FAT12 Hidden NTFS win  Linux swap/so  C1 drdos/sec (fat-
  

82 represents the swap partition:

hex  code ( type  l  to list codes):  
 class= "Hljs-type" style= "line-height:1.6;" >changed  system type  of partition 1 to  ( linux  swap/ solaris )   
 

4. View the partition table information (existing partition information) again:

Command (M for Help):P

DISK/DEV/SDB:21.5GB,21474836480 bytes
255Heads theSectors/track,2610Cylinders
Units = Cylinders of 16065* +=8225280 bytes
Sectorsize(logical/Physical): + bytes/ + bytes
I/Osize(Minimum/Optimal): + bytes/ + bytes
Disk identifier:0x00000000

Device BootStartEndBlocksIdSystem
/dev/sdb112622104483+ theLinux Swap/solaris

5, Save the partition table settings:

command (M for help ): w 
 The partition  table  has been altered! 
 
 calling  ioctl () to  re-read  partition  table . 
 Syncing disks.  
  

6. Allow the kernel to synchronize partition information (this step only needs to be performed if no partition device is found, not necessary.) ）：

[root@localhost ~]# partprobe

[[email protected] ~]# mkswap/dev/sdb1 
 Mkswap:/dev/sdb1:warning:don ' t erase bootbits sectors 
   &NBS P     (DOS Partition table detected). use - F  to  force . 
 Setting up Swapspace version  1 , size  = 2104476  KiB 
 no  Label, uuid  =a77266ac-b078-45  F7-a329-b95219d90e2b  
 

8, check the current memory usage situation, swap size is 2047:

[[Email protected] ~]# free-m
Total used FreeShared Buffers Cached
Mem:9806513290  +438
-/+ Buffers/cache: Max829
Swap:204702047

9. Enable the SDB1 swap partition:

[root@localhost ~]# swapon /dev/sdb1 

10. Check the memory usage of the current system again (swap is 4103m at this time):

[[Email protected] ~]# free-m
Total used FreeShared Buffers Cached
Mem:9806523280 +438
-/+ Buffers/cache:151 828
Swap:410304103

11, set to automatically mount the swap partition device after booting:

[[email protected] ~]# vim /etc/fstab
swapswap00

This article from "Live by the Sea like Waves" blog, please be sure to keep this source http://zhang789.blog.51cto.com/11045979/1847244

21, Disk Management-linux add swap swap partition