Mkswap Command Introduction:
Used to create a formatted swap partition swap.
1 . Command format:
Free to view system memory usage
-M: Displayed in m (default in bytes)
[[email protected] ~]# free
Total used free shared buffers Cached
mem:1938628 161284 1777344 0 26632 57404
-/+ buffers/cache:77248 1861380
swap:2047992 0 2047992
[Email protected] ~]# free-m
Total used free shared buffers Cached
mem:1893 157 1735 0 26 56
-/+ buffers/cache:75 1817
swap:1999 0 1999
Mkswap Disk EG:MKSWAP/DEV/SDA
-L label Specifies the volume label
SWAPON/DEVB/SDA9 Enable swap partition
SWAPOFF/DEV/SDA9 closing the Swap partition
2 . Command function:
Swap formatting for a partition
3 . Command parameters:
Free to view system memory usage
-M: Displayed in m (default in bytes)
Mkswap Disk EG:MKSWAP/DEV/SDA
-L label Specifies the volume label
4 . Command instance:
How do I increase the swap partition?
[Email protected] ~]# FDISK/DEV/SDA
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): p See if the hard disk has unallocated capacity and partition information
disk/dev/sda:21.5 GB, 21474836480 bytes
255 heads, Sectors/track, 2610 cylinders
Units = Cylinders of 16065 * 8225280 bytes
Sector size (logical/physical): bytes/512 bytes
I/O size (minimum/optimal): bytes/512 bytes
Disk identifier:0x000f2a2b
Device Boot Start End Blocks Id System
/DEV/SDA1 * 1 2048000 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 893 5120000 Linux
Partition 2 does not end on cylinder boundary.
/dev/sda3 893 1403 4096000-up Linux
/DEV/SDA4 1403 2611 9706496 5 Extended
/dev/sda5 1403 1786 3072000-up Linux
/dev/sda6 1786 2041 2048000, Linux Swap/solaris
/DEV/SDA7 2041 2296 2048000-up Linux
/dev/sda8 2296 2427 1057726 fd Linux raid Autodete
Command (M for help): n adds a new partition
First cylinder (2428-2611, default 2428):
Using Default Value 2428
Last cylinder, +cylinders or +size{k,m,g} (2428-2611, default 2611): +1g new partition size 1G
Command (M for help): t Modify partition type
Partition number (1-9): 9 Select the type of partition you want to modify
Hex code (Type L to list codes): l View all partition types supported by the system
0 Empty NEC DOS bayi minix/old Lin BF Solaris
1 FAT12 Plan 9 swap/so C1 drdos/sec (fat-
2 Xenix root 3c partitionmagic Linux C4 drdos/sec (fat-
3 Xenix usr Venix 80286 os/2 hidden c:c6 drdos/sec (fat-
4 FAT16 <32m PPC PReP Boot-up Linux extended C7 Syrinx
5 Extended SFS, NTFS volume set da non-fs data
6 FAT16 4d qnx4.x NTFS Volume set db cp/m/CTOS/.
7 Hpfs/ntfs 4e qnx4.x 2nd part of the Linux plaintext de Dell Utility
8 AIX 4f qnx4.x 3rd part 8e Linux LVM DF bootit
9 AIX bootable Ontrack DM Amoeba E1 DOS Access
A os/2 Boot manag Wuyi ontrack DM6 Aux 94 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) ez-drive a6 OpenBSD ef EFI (fat-12/16/
Ten OPUS Bow A7 NeXTSTEP f0 linux/pa-risc b
One Hidden FAT12 5c Priam edisk A8 Darwin UFS F1 SpeedStor
Compaq diagnost speedstor A9 NetBSD f4 SpeedStor
Hidden FAT16 <3, 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
Hex code (type L to list codes): 82 Select the type of partition type
Changed system type of partition 9 to Swap/solaris (Linux)
Command (M for help): p See if the hard disk has unallocated capacity and partition information
disk/dev/sda:21.5 GB, 21474836480 bytes
255 heads, Sectors/track, 2610 cylinders
Units = Cylinders of 16065 * 8225280 bytes
Sector size (logical/physical): bytes/512 bytes
I/O size (minimum/optimal): bytes/512 bytes
Disk identifier:0x000f2a2b
Device Boot Start End Blocks Id System
/DEV/SDA1 * 1 2048000 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 893 5120000 Linux
Partition 2 does not end on cylinder boundary.
/dev/sda3 893 1403 4096000-up Linux
/DEV/SDA4 1403 2611 9706496 5 Extended
/dev/sda5 1403 1786 3072000-up Linux
/dev/sda6 1786 2041 2048000, Linux Swap/solaris
/DEV/SDA7 2041 2296 2048000-up Linux
/dev/sda8 229 2427 1057726 fd Linux raid AutoDetect
/DEV/SDA9 2428 2559 1060258+ the Linux swap/solaris partition has been modified to swap type
W95 FAT3 Minix be Solaris boot ff BBT
1e Hidden W95 FAT1
Command (M for help): W Save partition operation and Exit
The partition table has been altered!
Calling IOCTL () to re-read partition table.
Warning:re-reading the partition table failed with error 16: The device or resource is busy.
The kernel still uses the old table. The new table is being used at
The next reboot or after you run Partprobe (8) or KPARTX (8)
[[email protected] ~]# PARTPROBE/DEV/SDA notify kernel to identify newly created partition
[[email protected] ~]# mkswap/dev/sda9 Format the partition as swap
Setting up, swapspace version 1, size=1011671 KB already formatted as swap format
[[email protected] ~]# free-m free-m View system memory usage in megabytes
Total used free shared buffers Cached
mem:1893 157 1735 0 26 56
-/+ buffers/cache:75 1817
swap:1999 0 1999 But there's still no increase in swap partition here .
[Email protected] ~]# swapon/dev/sda9
[[email protected] ~]# free-m free-m View system memory usage in megabytes
Total used free shared buffers Cached
mem:1893 157 1735 0 26 56
-/+ buffers/cache:75 1817
swap:2999 0 2999 here Swap partition swap increased to 3G new 1G
This article is from the "Learn Linux history" blog, please be sure to keep this source http://woyaoxuelinux.blog.51cto.com/5663865/1867555
Linux commands: Swap partition, free view memory usage, Mkswap create swap partition