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# swapo n -v /d ev/Vo l G ro up0 0 /Lo gVo l 02
To test if the logical volume was successfully created, use cat /pro c/swaps or free to inspect the
swap space.
15.1.3. Creat ing a Swap File
To add a swap file:
Pro ced u re 15.2. Ad d a swap f ile
1. Determine the size of the new swap file in megabytes and multiply by 1024 to determine the
number of blocks. For example, the block size of a 64 MB swap file is 65536.
2. Type the following command with co unt being equal to the desired block size:
# d d i f= /d ev/zero o f= /swapfi l e bs= 10 24 co unt= 6 5536
3. Setup the swap file with the command:
# mkswap /swapfi l e
4. It is recommended that the permissions are changed to prevent the swap being world
readable.
# chmo d 0 6 0 0 /swapfi le
5. To enable the swap file immediately but not automatically at boot time:
# swapo n /swapfi l e
6. To enable it at boot time, edit /etc/fstab to include the following entry:
/swapfi l e swap swap d efaul ts 0 0
The next time the system boots, it enables the new swap file.
To test if the new swap file was successfully created, use cat /pro c/swaps or free to inspect the
swap space.
15.2. Removing Swap Space
Sometimes it can be prudent to reduce swap space after installation. For example, say you
downgraded the amount of RAM in your system from 1 GB to 512 MB, but there is 2 GB of swap
space still assigned. It might be advantageous to reduce the amount of swap space to 1 GB, since
the larger 2 GB could be wasting disk space.
You have three options: remove an entire LVM2 logical volume used for swap, remove a swap file, or
reduce swap space on an existing LVM2 logical volume.
15.2.1. Reducing Swap on an LVM2 Logical Volume
Red Hat Ent erprise Lin ux 6 St orage Admin ist rat io n G uide
116
- Red Hat Enterprise Linux 6 1
- Storage Administration Guide 1
- Edition 2 3
- Edited by 4
- Legal Notice 5
- Abstract 5
- Table of Contents 6
- 1. Document Convent ions 13
- 1.2. Pull-quot e Convent ions 14
- Important 15
- 2.2. We Need Feedback 16
- Network Block Storage 18
- Part I. File Systems 19
- 2.1.1. FHS Organiz at ion 20
- 2.4. Discard unused blocks 29
- 3.2. Addit ional Informat ion 31
- Chapter 4. Btrfs 32
- Write Barriers 39
- Writ e Barriers 40
- Setting Project Limits 50
- Set t in g Project Limit s 52
- Simple Mode for xfsrest ore 54
- 9.2. pNFS 57
- 9.4. auto fs 59
- 9.7.4 . Host name Format s 73
- 9.7.5. NFS over RDMA 73
- 9.8. Securing NFS 74
- 9.9. NFS and rpcbi nd 76
- Related Books 78
- Chapter 10. FS-Cache 79
- 10.1. Performance Guarant ee 80
- 10.2. Set t ing Up a Cache 80
- 10.3.1. Cache Sharing 81
- Chapt er 1 0 . FS- Cache 82
- 10.6. References 84
- 11.3. Special Considerat ions 87
- Chapter 12. File System Check 90
- 12.2.2. XFS 92
- 12.2.3. Bt rfs 94
- Chapter 13. Partitions 95
- 13.2.3. Add t o /etc/fstab 98
- 13.3. Removing a Part it ion 99
- 13.4 . Resizing a Part it ion 99
- Chapt er 1 3. Part it ions 100
- 14 .1. What is LVM2? 102
- 14 .2.3. Migrat ing Ext ent s 109
- Installed Documentation 118
- Useful Websites 118
- Chapter 15. Swap Space 119
- Chapt er 1 5. Swap Space 120
- 15.2.3. Removing a Swap File 122
- 15.3. Moving Swap Space 123
- Chapter 16. Disk Quotas 124
- Chapt er 1 6 . Disk Q uot as 126
- 16.2. Managing Disk Quot as 128
- 16.3. Disk Quot a References 130
- Firmware RAID 131
- Hardware RAID 131
- Software RAID 132
- 17.3. Linux RAID Subsyst ems 134
- 17.5. Configuring RAID Set s 135
- 18.2.3. Sharing Mount s 142
- 18.4 .2. Useful Websit es 147
- 19.1. Commands 148
- 19.4. vo l ume_key References 152
- 20.1. Mount ing File Syst ems 153
- 20.2. Set t ing Access ACLs 153
- 20.3. Set t ing Default ACLs 154
- 20.4. Ret rieving ACLs 155
- 20.7. ACL References 156
- I/O Scheduler 159
- Virtual Memory 159
- Chapter 22. Write Barriers 160
- How Write Barriers Work 160
- Disabling Write Caches 161
- Battery-Backed Write Caches 161
- High-End Arrays 162
- Block Device ioctls 164
- 23.3. St andards 165
- 23.5. Logical Volume Manager 166
- File System tools 167
- 25.1. Fibre Channel 171
- 25.2. iSCSI 173
- 25.3. Persist ent Naming 175
- 25.3.1. WWID 176
- 25.16.1. Fibre Channel 199
- SCSI Error Handler 201
- Device States 203
- Command Timer 203
- 26.1. Virt ual St orage 205
- 26.2. DM-Mult ipat h 205
- Revision History 207
- Revision Hist ory 208
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