Swapfile
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Aktuelle Version vom 16:03, 10. Sep. 2011
Setting SWAP Memory under Solaris
QCKVU Solaris can allocate up to 4GB of RAM. If you have less than 4GB RAM, it is important to set the SWAP size in a way that the sum of the swap and RAM will be around 4000MB to make full use of QCKVU. Failing to do so, will probably prevent QCKVU from loading files in the 4GB range and above.
These are the steps to add swap space to your Solaris system through the use of swap files.
- Determine the amount of existing swap space
Use the command top to find out how much swap and RAM you have on your system.
top
load averages: 0.00, 0.00, 0.01 15:32:26 63 processes: 62 sleeping, 1 on cpu CPU states: 98.8% idle, 0.2% user, 1.0% kernel, 0.0% iowait, 0.0% swap Memory: 128M real, 61M free, 44M swap in use, 468M swap free
PID USERNAME THR PRI NICE SIZE RES STATE TIME CPU COMMAND
19005 hagai 1 33 0 1248K 1128K cpu 0:00 0.20% top.solaris
320 root 1 34 0 16M 6024K sleep 1:47 0.19% Xsun
The system has about 128MB RAM, and about 500MB swap.
To configure 2GB of swap, we can make one 2GB swap file or two 1GB swap files. We'll do two 1GB swap files because one 2GB swap file might not work depending on Linux kernel support for large files (file over 2GB).
- Make swap file named swapfile in /export/home
You should check using the df -k command which partiotion you can use to create the swap file. Then become super user and use the vi text editor to modify the file /etc/vfstab. You will need to add a line that looks like the last line in the following example..
more /etc/vfstab
- device device mount FS fsck mount mount
- to mount to fsck point type pass at boot options
- /dev/dsk/c1d0s2 /dev/rdsk/c1d0s2 /usr ufs 1 yes -
fd - /dev/fd fd - no - /proc - /proc proc - no - /export/home/swapfile - - swap - no -
- Turn swap file into a swap area
Next you will need to create the file and give it a size using the mkfile command.
mkfile -v 1000000000 swapfile
This creates the file /export/home/swapfile, 1GB in size. It also checks the swap file for bad blocks, and then turns it into swap space.
At this point you need to reboot the system so the changes will take effect.
- Verify that the system is using the swap file
Run the top command again to make sure the swap file is available.
top
CPU states: 98.8% idle, 0.2% user, 1.0% kernel, 0.0% iowait, 0.0% swap Memory: 128M real, 61M free, 29M swap in use, 1437M swap free
PID USERNAME THR PRI NICE SIZE RES STATE TIME CPU COMMAND 834 hagai 1 33 0 1280K 1064K cpu 0:00 0.03% top
Now the swap size is around 1500MB. If you have enough disk space, you can create two swap files, each 1GB or 2GB.
