CentOS - Mar 2007 - changing swap size

Is it possible to change the swap size with out re-installing the system?

Looking at the dd command but don't really know what to expect.

Many thanks for your help




-- 
This message has been scanned for viruses
and dangerous content by MailScanner at
caspercollege.edu and is believed to be clean.

On 3/29/07, Stewart Walker <Swalker at caspercollege.edu>
wrote:
>
> Is it possible to change the swap size with out re-installing the system?
>
> Looking at the dd command but don't really know what to expect.
>
> Many thanks for your help
>
>
>
>
> --
> This message has been scanned for viruses
> and dangerous content by MailScanner at
> caspercollege.edu and is believed to be clean.
>
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>
dd if=/dev/null of=/younewswap bs=1024 count=1024000   <-- for 100MB
mkswap /yournewswap
swapon /yournewswap


add an entry to your  /etc/fstab
and youre done .



-- 
Leonel

Stewart Walker spake the following on 3/28/2007 2:29 PM:
> Is it possible to change the swap size with out re-installing the system?
> 
> Looking at the dd command but don't really know what to expect.
> 
> Many thanks for your help
> 
> 
> 
> 
If you have the space available, you can add, remove, or change the swap on
demand. If you have unpartitioned space you could add a partition as large as
you want, with type 82 (linux swap), use mkswap to format it, and swapon the
partition. Then you could swapoff the old one and use the space for something
else. Then adjust /etc/fstab to reflect the new info.
You might be able to resize a swap partition from a rescue disk with parted.

-- 

MailScanner is like deodorant...
You hope everybody uses it, and
you notice quickly if they don't!!!!

Depends on what you mean by changing the swap size. You can increase
swap size by adding a swap file, which is a regular file on a
"regular"
filesystem. This can be done in a matter of minutes with only a few
commands. I haven't done it in a couple years, so I can't give you the
details off the top of my head. 

If you want to increase the size of a swap partition, or create another
swap parition, there's more work involved. Depending on how your disk(s)
are partitioned, it's possible to do it w/o rebuilding the entire
system. If you have to destroy a partition to give up some of it's space
to a new swap partition, you can tar the contents of that partition up,
repartition the disk, and then untar the files on to the new partition.
You shouldn't need to re-install the entire system. 


-- 
Prentice 

-----Original Message-----
From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On
Behalf Of Stewart Walker
Sent: Wednesday, March 28, 2007 5:30 PM
To: centos at centos.org
Subject: [CentOS] changing swap size


Is it possible to change the swap size with out re-installing the
system?

Looking at the dd command but don't really know what to expect.

Many thanks for your help




--
This message has been scanned for viruses and dangerous content by
MailScanner at caspercollege.edu and is believed to be clean.

_______________________________________________
CentOS mailing list
CentOS at centos.org
http://lists.centos.org/mailman/listinfo/centos




The contents of this communication, including any attachments, may be
confidential, privileged or otherwise protected from disclosure.  They are
intended solely for the use of the individual or entity to whom they are
addressed.  If you are not the intended recipient, please do not read, copy, use
or disclose the contents of this communication.  Please notify the sender
immediately and delete the communication in its entirety.