====== ZFS Howto ======

===== Replace failed disk =====
# Remove the failed disk and insert a new one

# Initialize Disk
<code bash>
/sbin/sgdisk /dev/sdb -g -U R
</code>
# Copy the partition table from /dev/sda to /dev/sdb
<code bash>
sgdisk --replicate=/dev/sdb /dev/sda
sgdisk --randomize-guids /dev/sdb
</code>
# Install Grub on the new disk
<code bash>
grub-install /dev/sdb

zpool list
zpool status -x
</code>
# Replace the disk in the rpool pool
<code bash>
zpool replace rpool /dev/sdb2
zpool status -x
</code>
# Scrub rpool pool
<code bash>
zpool scrub rpool
</code>

===== Monitoring ZFS with nagios =====
==== Client ====
#Install sudo:

Debian
<code bash>
apt-get install sudo 
</code>
CentOS 6/7
<code bash>
yum install sudo
</code>

Create /etc/sudoers.d/zfs file or append if file already exist, the following lines:
<code bash>
nagios ALL=NOPASSWD: /sbin/zfs
nagios ALL=NOPASSWD: /sbin/zpool
</code>

Create nagios account
<code bash>
addgroup --gid 50310 nagios
adduser --uid 50310 --gid 50310 --home /home/nagios --no-create-home nagios
scp -r <template_host>:/home/nagios /home
chown -R nagios:nagios /home/nagios
</code>
Copy ZFS check script on /usr/local/bin/check_zfs.py from cld-nagios
<code bash>
scp ~/check_zfs.py <hostname>:/usr/local/bin/
</code>

==== Server ====

Edit nagios config file
<code bash>
define service{
       use                             server-ssh-service         ; Name of service template to use
       host_name                       <hostname>
       service_description             ZFS
       check_command                   check_remote_zfs!rpool
       }
</code>

===== Monitoring smart with nagios =====
==== Client ====
#Install sudo:

Debian
<code bash>
apt-get install sudo 
</code>
CentOS 6/7
<code bash>
yum install sudo
</code>

Copy smart check script into /usr/local/bin/check_smartmon.py from cld-nagios
<code bash>
scp ~/check_smartmon.py <hostname>:/usr/local/bin/
</code>
Create /etc/sudoers.d/check-smartmon file or append if file already exist, the following lines:
<code bash>
nagios ALL=NOPASSWD: /usr/local/bin/check_smartmon.py
</code>

==== Server ====

Edit nagios config file
<code bash>
define service{
        use                             server-ssh-service         ; Name of service template to use
        host_name                       <hostname>
        service_description             Disk_Smart_sda
        check_command                   check_remote_smartmon!/dev/sda
        }
</code>