[pve-devel] [PATCH docs 4/7] installer: revise introduction

[Alexander Zeidler]

* Describe what the installer does, this was earlier included in the
  installation introduction
* Mention the importance of a redundant disk setup
* s/CD-ROM/DVD/
* Rephrase and expand the boot tip

Signed-off-by: Alexander Zeidler <a.zeidler at proxmox.com>
---
 pve-installation.adoc | 55 ++++++++++++++++++++++++++-----------------
 1 file changed, 34 insertions(+), 21 deletions(-)

diff --git a/pve-installation.adoc b/pve-installation.adoc
index 0065bca..404d66c 100644
--- a/pve-installation.adoc
+++ b/pve-installation.adoc
@@ -40,35 +40,48 @@ endif::wiki[]
 Using the {pve} Installer
 -------------------------
 
-The installer ISO image includes the following:
+The interactive installer guides you through the initial setup
+process. It will help you to partition your disks, apply basic
+settings such as the language, time zone and network configuration,
+and finally install all required packages within minutes.
+
+[IMPORTANT]
+====
+If your server does not yet meet the
+xref:system_requirements[recommended system requirements] in the best
+possible way, most points can also be improved at a later date.
+
+One exception is the installation of the hypervisor, which may not be
+easy to change to a redundant disk setup afterwards. To avoid
+reinstallation or data loss if a disk fails in the future, we
+recommend having two disks available for the OS installation and
+selecting them in the installer for a mirrored RAID level, for
+example, xref:chapter_zfs[ZFS RAID1].
+====
+
+CAUTION: Any existing data on the selected drives will be overwritten
+during the installation process. The installer does not add boot menu
+entries for other operating systems.
+
+Please insert the
+xref:installation_prepare_media[prepared installation medium] (for
+example, USB flash drive or DVD) and boot from it.
+
+TIP: You may need to go into your server's firmware settings, to
+enable booting from your installation medium (for example, USB) and
+set the desired boot order. When booting an installer prior to {pve}
+8.1, 'Secure Boot' needs to be disabled.
 
-* Complete operating system (Debian Linux, 64-bit)
-
-* The {pve} installer, which partitions the local disk(s) with ext4, XFS,
-  BTRFS (technology preview), or ZFS and installs the operating system
-
-* {pve} Linux kernel with KVM and LXC support
+[thumbnail="screenshot/pve-grub-menu.png"]
 
-* Complete toolset for administering virtual machines, containers, the host
-  system, clusters and all necessary resources
+After choosing the correct entry (for example, 'Boot from USB') the {pve} menu
+will be displayed.
 
-* Web-based management interface
 
-NOTE: All existing data on the selected drives will be removed during the
-installation process. The installer does not add boot menu entries for other
-operating systems.
 
-Please insert the xref:installation_prepare_media[prepared installation media]
-(for example, USB flash drive or CD-ROM) and boot from it.
 
-TIP: Make sure that booting from the installation medium (for example, USB) is
-enabled in your server's firmware settings. Secure boot needs to be disabled
-when booting an installer prior to {pve} version 8.1.
 
-[thumbnail="screenshot/pve-grub-menu.png"]
 
-After choosing the correct entry (for example, 'Boot from USB') the {pve} menu
-will be displayed, and one of the following options can be selected:
 
 Install {pve} (Graphical)::
 
-- 
2.39.5