linux - How to increase swap size?

Recently, I put more ram into my server and now I have got a total of 24GB of RAM. Originally, I setup the OS to have a 2GB swap size.

/dev/sdc1               1         281     2257101   82  Linux swap / Solaris
/dev/sdc2   *         282       60801   486126900   83  Linux

2GB is allocated for swap currently, but reading around it seems it is not much. For a system with 24GB, I am thinking to allocate at least 10GB of swap.

My questions is:
Can I do it while the OS is running? Do I have to reinstall?
I am using OpenSuse 11.3

Answer

You decided to create a separate swap partition upon installation. You can't resize it online - even an offline resize is going to take a considerable amount of time and bear the potential risk of damaging your subsequent filesystem on /dev/sdc2.

The easiest option to work around this is to either create a new swap partition on a different disk you don't currently use (or can afford to offline for re-partitioning) or simply use a swap file within an existing filesystem (which comes with some minor performance penalty due to the filesystem overhead).

The general procedure to add a swap partition/file:

create either a new partition of type 82h or a new 8 GB file using dd if=/dev/zero of=/swapfile bs=1M count=8192

initialize it using mkswap /swapfile or mkswap /dev/sdXX

use swapon /swapfile or swapon /dev/sdXX respectively to enable your new swap space on-the-fly

add an entry to /etc/fstab to make sure your new swap space gets activated upon reboot

Your current swap partition remains in use, you may want to get rid of it for the sake of complexity reduction. Just use swapoff /dev/sdc1 to disable its usage for the moment and remove the reference in /etc/fstab

Comments

linux - iDRAC6 Virtual Media native library cannot be loaded

When attempting to mount Virtual Media on a iDRAC6 IP KVM session I get the following error: I'm using Ubuntu 9.04 and: $ javaws -version Java(TM) Web Start 1.6.0_16 $ uname -a Linux aud22419-linux 2.6.28-15-generic #51-Ubuntu SMP Mon Aug 31 13:39:06 UTC 2009 x86_64 GNU/Linux $ firefox -version Mozilla Firefox 3.0.14, Copyright (c) 1998 - 2009 mozilla.org On Windows + IE it (unsurprisingly) works. I've just gotten off the phone with the Dell tech support and I was told it is known to work on Linux + Firefox, albeit Ubuntu is not supported (by Dell, that is). Has anyone out there managed to mount virtual media in the same scenario?

ubuntu - Monitoring CPU, Mem, disk, on a single server

I've been looking for a simple starter solution for monitoring my [currently] single server hosted solution. Other than Nagios and similar, are there other good (simple) solutions people are using? Answer Everything depends on what you want. For example Munin is very simple, you can install and configure it in less then 10 minutes (on one server), it can sends alarms, make graphs from monitoring cpu, mem. apache connections, eaccellerator, disk io and many many more (it has many plugins). But if you are planning in future get some more machines, munin may not be enough. For example in munin you cant monitor state of individual processes, can't monitor changes in files (for security purpose). So if you wanna only see what is the utilization of basics parameters on your server and don't plan to buy some more servers Munin is what you are looking for, but if you wanna be alarmed when some of your service is down, take more control on what is happeninig on...

hp proliant - Smart Array P822 with HBA Mode?

We get an HP DL360 G8 with an Smart Array P822 controller. On that controller will come a HP StorageWorks D2700 . Does anybody know, that it is possible to run the Smart Array P822 in HBA mode? I found only information about the P410i, who can run HBA. If this is not supported, what you think about the LSI 9207-8e controller? Will this fit good in that setup? The Hardware we get is used but all original from HP. The StorageWorks has 25 x 900 GB SAS 10K disks. Because the disks are not new I would like to use only 22 for raid6, and the rest for spare (I need to see if the disk count is optimal or not for zfs). It would be nice if I'm not stick to SAS in future. As OS I would like to install debian stretch with zfs 0.71 as file system and software raid. I have see that hp has an page for debian to. I would like to use hba mode because it is recommend, that zfs know at most as possible about the disk, and I'm independent from the raid controller. For us zfs have many benefits, ...

Blog

Search This Blog