Different updates

content/2.general/5.zfs.md

@@ -0,0 +1,76 @@
+---
+navigation: true
+title: ZFS
+main:
+  fluid: false
+---
+:ellipsis{left=0px width=40rem top=10rem blur=140px}
+# ZFS
+
+::alert{type="info"}
+🎯 __Objectives:__
+- Understand what ZFS is and why it's useful
+::
+
+ZFS is widely used in the world of servers, NAS systems (like FreeNAS / TrueNAS), virtualization, and even by tech-savvy individuals who want reliable storage. It is both a _file system_ (like NTFS for Windows, EXT4, FAT32, etc.) and a __volume manager__ (similar to LVM).
+
+To put it simply:  
+- A **volume manager** organizes physical storage (like one or more hard drives).  
+- A **file system** organizes how data blocks are written, read, and deleted within those volumes.
+
+ZFS goes far beyond traditional file systems in terms of performance and features.  
+Here’s what we’re most interested in:
+- Its __snapshot management__ features, allowing you to quickly roll back in case of issues.
+- Its support for disk groupings and [__RAID-like structures__](/global/RAID) (Z-Mirror, RAIDZ1, RAIDZ2, RAIDZ3).
+- Its __automatic recovery of corrupted data__ (through scrubbing).
+- Its performance, enhanced by RAM caching (ZFS ARC).
+- Its robust error notifications and monitoring.
+
+## Structure
+
+![](/img/global/zfs.svg)
+
+ZFS has a unique structure:
+
+- **vdev** (virtual device): a group of physical or virtual disks.
+- **zpool**: a collection of vdevs configured as a single storage pool. A zpool can contain multiple vdevs, but a vdev belongs to only one zpool.
+- **dataset**: a logical data container within a zpool. Each dataset can have its own settings (compression, quotas, permissions, etc.).
+
+There are several dataset types:
+- **file system**: a standard ZFS filesystem, mounted without storage quotas.
+- **zvol**: a "virtual disk" with a defined size, which you can format and partition as if it were a physical disk.
+- **snapshot**: a frozen-in-time version of another dataset. Snapshots can be created manually or through backup tools. They can be mounted to browse data as it was at the snapshot time.
+
+## Why ZFS over others?
+
+### Data Integrity
+
+ZFS continuously checks that your stored data hasn't become corrupted. Every block of data is associated with a checksum, allowing ZFS to detect even the smallest alteration. If corruption is found and a healthy copy exists elsewhere, ZFS can repair the data automatically.
+
+### Built-in RAID
+
+ZFS includes its own volume management system (vdevs). You can build a zpool using multiple disks—similar to traditional [RAID](/global/RAID) setups—but with more flexibility. For example:
+- **Z-mirror** → equivalent to RAID 1
+- **RAIDZ1** → equivalent to RAID 5 (tolerates 1 disk failure)
+- **RAIDZ2** → equivalent to RAID 6 (tolerates 2 disk failures)
+- **RAIDZ3** → tolerates up to 3 disk failures
+
+ZFS handles all this natively—no external RAID software needed.
+
+::alert{type="info"}
+:::list{type="info"}
+- Check out the [article on RAID](/global/RAID) to find the right solution for your needs.
+:::
+::
+
+### Snapshots and Clones
+
+ZFS allows you to create snapshots—instantaneous images of a dataset's state. Snapshots take up minimal space and can be scheduled frequently. You can also create clones: writable copies of snapshots.
+
+### Compression and Deduplication
+
+ZFS can compress data on the fly (transparently to the user), saving disk space. It also supports deduplication (removing duplicate data), though this feature requires a lot of memory and is not recommended for all use cases.
+
+---
+
+Now you know why ZFS is *the* file system to deploy on your NAS.

content/3.serveex/5.media/3.servarr.md

@@ -49,11 +49,20 @@ root
 │   └── overseerr
 │       └── config
 └── media
+    ├── downloads
     ├── tvseries
     ├── movies
     └── library
 ```
 
+::alert{type="warning"}
+:::list{type="warning"}
+- __Warning:__ Make sure to follow this file structure carefully, especially the `media` folder. This folder must be mounted **exactly the same way** in both the _Qbittorrent_ compose file (`/your/path/media:/media`) and the _arr_ applications.  
+If not, the _arr_ apps may not recognize the path provided by Qbittorrent and will fail to create _hardlinks_.  
+Without hardlinks, the _arr_ apps will copy the files instead—**doubling the space used** on your storage.
+:::
+::
+
 Open Docker and your `plex` stack. Modify the compose file as follows:
 ```yaml
 ---

content/4.Stockeex/1.introduction.md

@@ -7,6 +7,8 @@ main:
 ---
 :ellipsis{left=0px width=40rem top=10rem blur=140px}
 
+![](/img/stockeex/stockeex-raid.svg)
+
   ::terminal{style="margin-top:80px;"}
   ---
   content: