+[[chapter_zfs]]
ZFS on Linux
------------
ifdef::wiki[]
practice, use as much you can get for your hardware/budget. To prevent
data corruption, we recommend the use of high quality ECC RAM.
-If you use a dedicated cache and/or log disk, you should use a
+If you use a dedicated cache and/or log disk, you should use an
enterprise class SSD (e.g. Intel SSD DC S3700 Series). This can
increase the overall performance significantly.
ZFS comes with an event daemon, which monitors events generated by the
ZFS kernel module. The daemon can also send emails on ZFS events like
-pool errors.
+pool errors. Newer ZFS packages ships the daemon in a separate package,
+and you can install it using `apt-get`:
+
+----
+# apt-get install zfs-zed
+----
To activate the daemon it is necessary to edit `/etc/zfs/zed.d/zed.rc` with your
favourite editor, and uncomment the `ZED_EMAIL_ADDR` setting:
====
+[[zfs_swap]]
.SWAP on ZFS
-SWAP on ZFS on Linux may generate some troubles, like blocking the
+Swap-space created on a zvol may generate some troubles, like blocking the
server or generating a high IO load, often seen when starting a Backup
to an external Storage.
We strongly recommend to use enough memory, so that you normally do not
-run into low memory situations. Additionally, you can lower the
+run into low memory situations. Should you need or want to add swap, it is
+preferred to create a partition on a physical disk and use it as swapdevice.
+You can leave some space free for this purpose in the advanced options of the
+installer. Additionally, you can lower the
``swappiness'' value. A good value for servers is 10:
sysctl -w vm.swappiness=10