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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for February 16th, 2018

Nas4free – keeping an eye on the daily increase of ZFS disk usage

Posted by jpluimers on 2018/02/16

Assuming your nas4free is at https://nas4free, this page will give you the daily increase of ZFS usage:


There you can estimate based on the snapshot history how soon you will run out of ZFS storage.

This is especially important when you have a retention configured using ZFS [WayBackauto snapshots. Under the same assumption, those are configured at  https://nas4free/disks_zfs_snapshot_auto.php in order to support “Previous Versions” on CIFS shares using those ZFS volumes.

Note nas4free is way harder to configure in this respect than freenas, see for instance this article: [WayBackThe Ars NAS distribution shootout: FreeNAS vs NAS4Free | Ars Technica. Luckily there is this small guide to get you going [WayBackJason’s Notes » Blog Archive » Windows previous versions for ZFS backed Samba shares

In the logs at https://nas4free/diag_log.php you can view the snapshot management: when they are created and removed. When you have trouble with the snapshots, monitor your Nas4free version at https://nas4free/system_firmware.php.. For me, NAS4Free 10.3.* seem very stable.

If you for instance have a 5 gigabyte nightly backup written to such a snapshot volume and the volume has 500 gigabytes of free space, a retention of 100 days it will fill up after 100 days.


PS: background reading:



Posted in *nix, nas4free, Power User, ZFS | Leave a Comment »

How to Install and Configure Postfix as a Send-Only SMTP Server on Ubuntu 16.04 | DigitalOcean

Posted by jpluimers on 2018/02/16

[WayBackHow to Install and Configure Postfix as a Send-Only SMTP Server on Ubuntu 16.04 | DigitalOcean

Postfix is a *mail transfer agent* (MTA), an application used to send and receive email. In this tutorial, we will install and configure Postfix so that it can be used to send emails by local applications only.


Posted in *nix, Linux, Power User, Ubuntu | Leave a Comment »

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