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Tag Archives: FreeNAS

email me the result of a cronjob/script in Freenas

This is the simplest method to email the result of a command in Freenas.
For example if you run certain scripts with Cron you can use it also.

Personally I use this to get the SMART report about a HDD that may fail soon. So what I put in Cron this (all in one line) :

smartctl -a /dev/ada1 | /usr/bin/mail -s "MyFREENAS HDD /ada1 report "

For user you can put “root” and any redirect should be off.

Of course to make the email work you have to configure the email server, ..etc… in the user config. Fill the settings here : System –> Email.

how to add/replace disk to FreeNAS mirror

I recently had to add new disks to my FreeNAS storage. I mounted the disks but I was not able to add them as mirror from GUI interface. But I found this Russian website with very simple and easy to follow tutorial. I copied here mainly for me as a reminder but may be also useful for others.

I hope the original author will not be upset.

The original post is here :

The high-level steps are:

Add the new disk to the system – (means connect the cables)
Partition the disk with gpart – (from FreeNAS terminal)
Attach the new partition to ZFS as a mirror

Create the GPT

Use the GUI to find the device ID of the new drive or use camcontrol.

# camcontrol devlist
at scbus2 target 0 lun 0 (ada0,pass0)
at scbus3 target 0 lun 0 (ada1,pass1)
at scbus4 target 0 lun 0 (ada2,pass2)
at scbus5 target 0 lun 0 (ada3,pass3)
at scbus7 target 0 lun 0 (da0,pass4)

let assume that our target is ada1. Create the GUID partition table for ada1.

# gpart create -s gpt ada1
ada1 created

Add the Swap Partition

Create a swap partition matching what FreeNAS created on the original drive. FreeNAS puts a swap partition on every data drive by default, stripes them together, and encrypts with a temporary key each boot. I’m not sure how that works when a drive fails, but it’s the recommended configuration.

# gpart add -b 128 -i 1 -t freebsd-swap -s 2G ada1
ada1p1 added

Add the Data Partition

Use the remaining space for the data partition.
# gpart add -i 2 -t freebsd-zfs ada1
ada1p2 added

Get the GPTID for the Partition

A device may change names depending on the connected port but the GPTID doesn’t change. FreeNAS uses the GPTID to track disks and so we want the rawuuid field of ada1p2.

# gpart list ada1
Geom name: ada1
scheme: GPT
1. Name: ada1p1
Mediasize: 2147483648 (2.0G)
rawuuid: 38d6835c-4794-11e4-b95b-08606e6e53d5
2. Name: ada1p2
Mediasize: 1998251364352 (1.8T)
rawuuid: 40380205-4794-11e4-b95b-08606e6e53d5

Attach to ZFS as mirror

Attach the partition using zpool which will begin the resilvering process. You will need the GPTID of the encrypted original disk parition.

# zpool attach
# zpool attach storage /dev/gptid/1c5238f9-5e2d-11e3-b7e0-08606e6e53d5 /dev/gptid/40380205-4794-11e4-b95b-08606e6e53d5