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This is my personal notes on RHCSA/RHCE exam. Site still work in progress. For comments and suggestions email me at mctofferatgmaildotcom

RHCE/RHCSA Exam Notes

Wednesday, June 8, 2011

Creating Swap

Creating swap thru disk partition

[root@rhel02 ~]# free -m

total used free shared buffers cached

Mem: 997 254 743 0 2 114

-/+ buffers/cache: 137 859

Swap: 2015 0 2015

Create the disk partition

[root@rhel02 ~]# parted /dev/sdb

GNU Parted 2.1

Using /dev/sdb

Welcome to GNU Parted! Type 'help' to view a list of commands.

(parted) mkpart

Partition type? primary/extended? primary

File system type? [ext2]? linux-swap

Start? 0

End? 200

Warning: The resulting partition is not properly aligned for best performance.

Ignore/Cancel? Ignore

(parted) pr

Model: VBOX HARDDISK (scsi)

Disk /dev/sdb: 524MB

Sector size (logical/physical): 512B/512B

Partition Table: msdos

Number Start End Size Type File system Flags

1 512B 200MB 200MB primary linux-swap(v1)

Initialize the disk partion

[root@rhel02 ~]# mkswap /dev/sdb1

Setting up swapspace version 1, size = 195308 KiB

no label, UUID=364ca39e-dc67-4f8d-9790-e2715425d248

Add the newly created swap

[root@rhel02 ~]# swapon /dev/sdb1

[root@rhel02 ~]# swapon -s

Filename Type Size Used Priority

/dev/dm-1 partition 2064376 0 -1

/dev/sdb1 partition 195304 0 -2

[root@rhel02 ~]# free -m

total used free shared buffers cached

Mem: 997 262 735 0 6 115

-/+ buffers/cache: 140 856

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Posted by penoi at 5:57 PM No comments:

Labels: filesystem, swap

Swap: 2206 0 2206

Creating swap thru a swapfile(example 200mb of swapfile)

[root@rhel02 ~]# dd if=/dev/zero of=/tmp_swap/swapfile bs=1024 count=204800

204800+0 records in

204800+0 records out

209715200 bytes (210 MB) copied, 29.5354 s, 7.1 MB/sd

[root@rhel02 ~]# mkswap /tmp_swap/swapfile

mkswap: /tmp_swap/swapfile: warning: don't erase bootbits sectors

on whole disk. Use -f to force.

Setting up swapspace version 1, size = 204796 KiB

no label, UUID=5d77de02-b28f-43a1-9410-fed6d05172c4d

[root@rhel02 ~]# swapon /tmp_swap/swapfile

[root@rhel02 ~]# swapon -s

Filename Type Size Used Priority

/dev/dm-1 partition 2064376 0 -1/dev/sdb1 partition 195304 0 -2

/tmp_swap/swapfile file 202288 0 -3

[root@rhel02 ~]# free -m

total used free shared buffers cached

Mem: 997 491 505 0 11 315

-/+ buffers/cache: 164 833

Swap: 2404 0 2404

Remove swap

[root@rhel02 ~]# swapoff /tmp_swap/swapfile

[root@rhel02 ~]# swapoff /dev/sdb1

[root@rhel02 ~]# swapon -s

Filename Type Size Used Priority

/dev/dm-1 partition 2064376 0 -

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