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IMPORTANT: Updating initramfs or init
The boot loader loads initramfs or init in the same way as the Kernel. It
is not necessary to re-install GRUB after updating initramfs or init, because
GRUB searches the directory for the right le when booting.
7.1.2
init on initramfs
The main purpose of init on initramfs is to prepare the mounting of and access
to the real root le system. Depending on your system conguration, init on
initramfs is responsible for the following tasks.
Loading Kernel Modules
Depending on your hardware conguration, special drivers may be needed to access
the hardware components of your computer (the most important component being
your hard drive). To access the nal root le system, the Kernel needs to load the
proper le system drivers.
Providing Block Special Files
For each loaded module, the Kernel generates device events. udev handles these
events and generates the required special block les on a RAM le system in /dev.
Without those special les, the le system and other devices would not be accessi-
ble.
Managing RAID and LVM Setups
If you congured your system to hold the root le system under RAID or LVM,
init on initramfs sets up LVM or RAID to enable access to the root le
system later. Find information about RAID and LVM in Chapter 3, Advanced Disk
Setup (page 73).
Managing Network Conguration
If you congured your system to use a network-mounted root le system (mounted
via NFS), init on initramfs must make sure that the proper network drivers
are loaded and that they are set up to allow access to the root le system.
If the le system resides on a network block device like iSCSI or SAN, the connec-
tion to the storage server is also set up by init on initramfs.
130 Reference
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