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Adding more swapfiles
6 October 2000
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| 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. |
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Out of swap space again
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I need yet more swap. So I went and created a new swap file:# 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 = 300Mb). Enjoy. |
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Creating a new device
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Before we can use this swapfile, we need to create a new vnconfig
device. Here's how I did that:# cd /dev # ./MAKEDEV vn1 |
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Telling vnconfig about the new swapfile
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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. |
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Restarting vnconfig
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Actually, I just rebooted to check some NFS issues, but I suspect the following would
be sufficient:vnconfig -ae |
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The results
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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. |