Is it good or bad to use ZFS for hosting a database?<p>This article alludes to a claim that ZFS has fragmentation issues: <a href="http://antydba.blogspot.com/2010/02/mongodb-backup-with-zfs.html" rel="nofollow">http://antydba.blogspot.com/2010/02/mongodb-backup-with-zfs....</a><p>Because ZFS is a copy-on-write filesystem, Eliot Horowitz says he wouldn't use it for a database: <a href="http://groups.google.com/group/mongodb-user/msg/731111475835e8ca" rel="nofollow">http://groups.google.com/group/mongodb-user/msg/731111475835...</a><p>However, a controverting opinion is offered by Jason J. W. Williams, who claims that ZFS works well with large MySQL installs: <a href="http://groups.google.com/group/mongodb-user/msg/e94712bc287ae3c0" rel="nofollow">http://groups.google.com/group/mongodb-user/msg/e94712bc287a...</a><p>[edit: Updated links]