Ing . Marcos Luís Ortíz Valmaseda wrote: > Regards to all the list. > ZFS, the new filesystem developed by the Solaris Development team and > ported to FreeBSD too, have many advantages that can do that all > sysadmins are questioned > about if it is a good filesystem to the PostgreSQL installation. > Any of you haved tested this filesystem like PostgreSQL installation fs? It will work but as to if it is a good file system for databases, the debate still goes on. Here are some links about ZFS and databases: http://blogs.sun.com/paulvandenbogaard/entry/postgresql_on_ufs_versus_zfs http://blogs.sun.com/paulvandenbogaard/entry/running_postgresql_on_zfs_file http://blogs.sun.com/realneel/entry/mysql_innodb_zfs_best_practices http://dev.mysql.com/tech-resources/articles/mysql-zfs.html http://blogs.smugmug.com/don/2008/10/13/zfs-mysqlinnodb-compression-update/ A separate issue (I think it is not explored enough in the above links) is that ZFS writes data in a semi-continuous log, meaning there are no in-place modifications of files (every such write is made on a different place), which leads to heavy fragmentation. I don't think I have seen a study of this particular effect. OTOH, it will only matter if the DB usage pattern is sequential reads and lots of updates - and even here it might be hidden by internal DB data fragmentation.
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