ZFS on Linux
------------
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+ifdef::wiki[]
+:pve-toplevel:
+endif::wiki[]
ZFS is a combined file system and logical volume manager designed by
Sun Microsystems. Starting with {pve} 3.4, the native Linux
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.
the boot loader on all disk required for booting. So you can boot
even if some disks fail.
-NOTE: It is not possible to use ZFS as root partition with UEFI
+NOTE: It is not possible to use ZFS as root file system with UEFI
boot.
If you have an pool without cache and log. First partition the SSD in
2 partition with `parted` or `gdisk`
-IMPORTANT: Always use GPT partition tables (gdisk or parted).
+IMPORTANT: Always use GPT partition tables.
The maximum size of a log device should be about half the size of
physical memory, so this is usually quite small. The rest of the SSD
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 sparate 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:
+--------
ZED_EMAIL_ADDR="root"
+--------
Please note {pve} forwards mails to `root` to the email address
configured for the root user.
To make the swappiness persistent, open `/etc/sysctl.conf` with
an editor of your choice and add the following line:
- vm.swappiness = 10
+--------
+vm.swappiness = 10
+--------
.Linux kernel `swappiness` parameter values
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