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--- quickreference:zfs [2022/12/17 14:10] – [iSCSI considerations] rodolico
+++ quickreference:zfs [2024/02/03 23:04] (current) – rodolico
@@ Line 56: / Line 56: @@
 # turn swap back on (could also use swapon /dev/zvol/storage/swap, but I'm lazy)
 swapon -aL
+</code>
+===== Using a file for swap space =====
+Instead of using a swap partition or zvol, we can simply use a file. In this case, we can add swap space by deleting/recreating the swap file (after turning swap off), but a simpler way if you need more swap space is to simply add a second swap file.
+Following code creates an 8G swap file. Note that after reading https://www.cyberciti.biz/faq/create-a-freebsd-swap-file/, I modified my old way of doing this.
+<code bash>
+# create an 8G swap file
+dd if=/dev/zero of=/swap bs=1G count=8
+# set permissions
+chmod 0600 /swap
+# look for an unused md device (ie, not listed)
+mdconfig -lv
+cp /etc/fstab /etc/fstab.save
+# edit /etc/fstab and add the following line, using the correct md##
+joe /etc/fstab
+md42	none	swap	sw,file=/swap	0	0
+# save your file
+# turn on swap
+swapon -aq
+# look at swap information
+swapinfo -k
 </code>
@@ Line 158: / Line 182: @@
    * https://wordpress.morningside.edu/meyersh/2009/11/30/zfs-deduplication/
    * https://linuxhint.com/zfs-deduplication/
+   * https://www.cyberciti.biz/faq/create-a-freebsd-swap-file/