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--- omv7:omv7_plugins:zfs [2025/06/26 12:27] – [Additional Reading] crashtest
+++ omv7:omv7_plugins:zfs [2025/08/07 13:13] (current) – [What is ZFS?] crashtest
@@ Line 16: / Line 16: @@
 **ZFS** (the **Z**ettabyte **F**ile **S**ystem) is a high-performance, scalable file system and logical volume manager designed by Sun Microsystems which is now part of Oracle. It was originally developed for the Solaris operating system and it's the granddaddy of **COW** (**C**opy **O**n **W**rite) filesystems. ZFS has since been ported to other platforms, to include Linux and FreeBSD .  Having been under constant development since its creation for Sun Solaris server, in 2001, ZFS is very mature.
-Currently, [[https://zfsonlinux.org/|OPENZFS on Linux]] is sponsored by [[https://computing.llnl.gov/projects/openzfs|Lawrence Livermore Labs]], it's very well-funded and will be fully supported into the foreseeable future and, likely, beyond.
+Currently, [[https://zfsonlinux.org/|OPENZFS on Linux]] is sponsored by [[https://computing.llnl.gov/projects/openzfs|Lawrence Livermore Labs]].  OPENZFS it's very well-funded and will be fully supported into the foreseeable future and, likely, beyond.
 ==== ZFS Features ====
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-More detailed information on capabilities and limitations is available -> [[https://www.howtogeek.com/175159/an-introduction-to-the-z-file-system-zfs-for-linux/|here]].
+More detailed information on capabilities and limitations is available -> [[https://www.zfshandbook.com/docs/getting-started/introduction|here]].
 <html>
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 ===== Prerequisites =====
+  * An **amd64 (64 bit) workstation** or server. \\ **Note:** ZFS on SBC's (Single Board Computers), like the Raspberry PI, Odriods and others, is **NOT supported**.\\
   * PuTTY is a prerequisite for installing OMV-Extras and for working with ZFS on the command line.  \\ [[https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html|PuTTY]] is an SSH client that will allow users to connect to their SBC, from a Windows client, to get on the server's command line.  PuTTY is installable on a Windows client.  Installation and use guidance, for PuTTY, can be found ->[[https://wiki.omv-extras.org/doku.php?id=omv7:utilities_maint_backup#putty|here]].
   * [[https://wiki.omv-extras.org/doku.php?id=misc_docs:omv_extras|OMV-Extras]] is a prerequisite for installing the kernel plugin.  Installation and use guidance, for the OMV-Extras plugin can be found ->[[https://wiki.omv-extras.org/doku.php?id=misc_docs:omv_extras|here]].
-  * The **Kernel Plugin** is **required** for ZFS.  After OMV-Extras is installed, on OMV's left side menu bar go to **System**, **Plugins**.  Find, select, and install the **openmediavault-kernel** 7.x.x plugin.
+  * The **Kernel Plugin** is **required** for ZFS.  After OMV-Extras is installed, on OMV's left side menu bar, go to **System**, **Plugins**.  Find, select, and install the **openmediavault-kernel** 7.x.x plugin.\\
 ===== Foreword =====
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 While all use cases are not the same, for this sake of this discussion, we'll assume that users reading this document are NOT Corporate or Datacenter Admins. The assumption will be that readers are home server users, server admins for small businesses, or other entities that have 25 users or less.  In other words, when compared to Enterprise level network traffic, we're talking about relatively "light usage".\\
 \\
-The author of this document, in personal experience with running ZFS, has set up a 4TB pool on a host with 4GB of RAM and an older Atom processor (read, "a weak CPU").  File server performance for a few users, along with streaming data, was fine.  Memory might become an issue only if "dedup" (deduplication of data) is turned ON.  (This is an Enterprise feature that is __OFF__ by default.)  In most home or small business use cases, ZFS' CPU requirements are modest.\\
+The author of this document, in personal experience with running ZFS, has set up a 4TB pool on a host with 4GB of RAM and an older Atom processor (read, "a weak CPU").  File server performance for a few users, along with streaming data, was fine.  Memory might become an issue only if "dedup" (deduplication of data) is turned ON.  ("Dedup" is an Enterprise feature that is __OFF__ by default.)  In most home or small business use cases, ZFS' CPU requirements are modest.\\
 \\
 **"ECC RAM is required to run ZFS".**\\
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 **TL;DR** proceed to -> [[https://wiki.omv-extras.org/doku.php?id=omv7:omv7_plugins:zfs#installing_the_zfs_plugin|Installing the ZFS plugin]].\\
 \\
-Removing non-proxmox kernels is recommended in that, when Openmediavault is updated, the remaining Debian kernels will be updated as well.  These updates will also update the grub bootloader with unnecessary entries for the newer Debian Kernels.  While rare, occasionally, grub/kernel updates do not go well.  Issues with unused Debian Kernels and their grub updates can be prevented by removing non-proxmox kernels.\\
+Removing non-proxmox kernels is recommended in that, when Openmediavault is updated, the remaining but unused Debian kernels will be updated as well.  These updates will also update the grub bootloader with unnecessary entries for the newer Debian Kernels.  While rare, occasionally, grub/kernel updates do not go well.  Issues with unused Debian Kernels and their grub updates can be prevented by removing non-proxmox kernels.\\
 \\
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 One of the most powerful features of using ZFS filesystems is that each filesystem can have its own set of snapshots, making backups and versioning much more flexible and granular.\\
 \\
-As a best practice, ZFS filesystems can be used to organize and separate different types of data — such as Documents, Music, Pictures, and Videos. This allows you to fine-tune settings (e.g., compression for documents, record size for video files) and manage snapshots independently for each data type, making your NAS more efficient and easier to maintain.\\
+As a best practice, ZFS filesystems can be used to organize and separate different types of data — such as Documents, Music, Pictures, and Videos. This allows admin's to fine-tune settings (e.g., compression for documents, record size for video files) and manage snapshots independently for each data type, making your NAS more efficient and easier to maintain.\\
 \\
 {{ :omv7:omv7_plugins:zfs-09.jpg?nolink&400 |}}
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 \\
 {{ :omv7:omv7_plugins:zfs-07.jpg?nolink&600 |}}
+\\
+<html><center>Select <b>+ Add filesystem|snap|volume</b></center></html>
+\\
 \\
 ----
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 {{ :omv7:omv7_plugins:zfs-08.jpg?nolink&600 |}}\\
 \\
-<html><center>Confirm the Pending Change.</center></html>
+\\
+<html><center><b>Confirm</b> the Pending Change.</center></html>
 \\
 <html><center>Repeat as needed for the filesystems necessary for the use case.</center></html>\\
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   * **Mirror**:
-Also known as a Zmirror.  A Zmirror is a RAID1 equivalent.  A mirror requires a 2 disk minimum.  In that there are always at least __2 copies__ of all files in a Mirror, data integrity scrubs automatically correct data errors. Further, it's worth noting that more than 2 disks can be added to a single Mirror.  Adding more than 2 disks creates additional disk mirrors and more than 2 copies of all files. While the cost is the loss of hard drive space, multiple drives in a mirror configuration provides for **maximum** data integrity and safety.  For the reasons stated in this -> [[https://jrs-s.net/2015/02/06/zfs-you-should-use-mirror-vdevs-not-raidz/|reference]], using VDEV(s) comprised of one or more mirrors should be considered and is recommended.\\
+Also known as a Zmirror.  A Zmirror is a RAID1 equivalent.  A mirror requires a 2 disk minimum.  In that there are always at least __2 copies__ of all files in a Mirror, data integrity scrubs automatically correct data errors. Further, it's worth noting that more than 2 disks can be added to a single Mirror.  Adding more than 2 disks creates additional disk mirrors and more than 2 copies of all files. While the cost is the loss of hard drive space, multiple drives in a mirror configuration provides for **maximum** data integrity and safety.  For the reasons stated in this -> [[https://jrs-s.net/2015/02/06/zfs-you-should-use-mirror-vdevs-not-raidz/|reference]], using VDEV(s) comprised of one or more mirrors should be considered and is recommended.
-For RAID-Z implementations, it is generally recommended to run an "**odd**" number of drives.
   * **RAID-Z1**: With one striped parity disk, this is the equivalent of RAID5. (RAID-Z1 requires 3 disks minimum.  A rule of thumb maximum would be 7 drives.)\\
   * **RAID-Z2**: With two striped parity disks, this is the equivalent of RAID6. (RAID-Z2 requires 4 disks minimum. A rule of thumb maximum would be 11 drives )\\
   * **RAID-Z3**: With three striped parity disks, RAID-Z3 has no traditional RAID equivalent but it could, notionally, be called RAID7. (RAID-Z3 requires 5 disks minimum. A rule of thumb maximum would be 15 drives.)\\
-\\
+<html>
+<body>
+  <table width="100%" border="0">
+    <tr>
+      <td colspan="2" style="background-color:#69A5FF;height:30px;">
+        <strong><span style="color:#FFFFFF;font-size:110%;">&#160; Note</span></strong>
+      </td>
+    </tr>
+    <tr>
+      <td style="background-color:#E6FEFF;height:25px;width:380px;">
+        In RAID-Z implementations, it is generally recommended to run an <b>odd</b> number of drives.
+    </tr>
+  </table>
+</body>
+</html>
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