Adding more swapfiles
If you want to add a swapfile, perhaps you should read swap files
first. This article deals with adding a additional swapfile after adding your first
swapfile. So if you already have a swap file (and I’m not talking about a swap
partition), and you want to add another, then this is the article for you.
Out of swap space again
# dd if=/dev/zero of=/usr2/swapfile bs=15m count=20 10+0 records in 20+0 records out 314572800 bytes transferred in 40.594 secs (387462 bytes/sec)
Note that the above should have give you a 300Mb file (bs=15m, count=20 or 15Mx20 =
Creating a new device
Before we can use this swapfile, we need to create a new vnconfig
device. Here’s how I did that:
# cd /dev # ./MAKEDEV vn1
Telling vnconfig about the new swapfile
Before I started this article, my /etc/vntab contained this:
/dev/vn0c /usr4/swapfile swap
After adding the new device, here’s what the config file looked like:
/dev/vn0c /usr4/swapfile swap /dev/vn1c /usr2/swapfile swap
My thanks to Glenn Johnson for his advice on the MAKEDEV and the config file.
Actually, I just rebooted to check some NFS issues, but I suspect the following would
Now I have this as swap space:
$ swapinfo Device 1K-blocks Used Avail Capacity Type /dev/ad0s1b 70776 2128 68648 3% Interleaved /dev/rvn0c 153472 2088 151384 1% Interleaved /dev/rvn1c 307072 2248 304824 1% Interleaved Total 531320 6464 524856 1%
We’ll see how that goes.