Swap, SSDs and ZFS

Arthur Chance freebsd at qeng-ho.org
Thu Mar 26 12:46:50 UTC 2015

Warren Block's page on using SSDs with FreeBSD 
(http://www.wonkity.com/~wblock/docs/html/ssd.html) suggests that as 
swap doesn't use TRIM it's better to use a swap file if your disk is an 
SSD. However, this is in the context of a UFS file system.

What if you have a pure ZFS system? Searching for an answer I found 
mailing list threads that say that ZVOLs can hang when under memory 
pressure, i.e. at the exact point when you need swap, so aren't 
recommended. However using a swap file will potentially waste space if 
the file system has snapshots. What do other people do in these 

Those who do not learn from computing history are doomed to

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