Red Hat ENTERPRISE LINUX 5 - VIRTUAL SERVER ADMINISTRATION, Руководство по установке

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Chapter 12. Installing on IBM System i and IBM System p systems
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12.19.4. Recommended Partitioning Scheme
Unless you have a reason for doing otherwise, we recommend that you create the following partitions:
• A swap partition (at least 256 MB) — swap partitions are used to support virtual memory. In other
words, data is written to a swap partition when there is not enough RAM to store the data your
system is processing.
In years past, the recommended amount of swap space increased linearly with the amount of
RAM in the system. But because the amount of memory in modern systems has increased into the
hundreds of gigabytes, it is now recognized that the amount of swap space that a system needs is a
function of the memory workload running on that system. However, given that swap space is usually
designated at install time, and that it can be difficult to determine beforehand the memory workload
of a system, we recommend determining system swap using the following table.
Amount of RAM in the System Recommended Amount of Swap Space
4GB of RAM or less a minimum of 2GB of swap space
4GB to 16GB of RAM a minimum of 4GB of swap space
16GB to 64GB of RAM a minimum of 8GB of swap space
64GB to 256GB of RAM a minimum of 16GB of swap space
256GB to 512GB of RAM a minimum of 32GB of swap space
Table 12.2. Recommended System Swap Space
Note that you can obtain better performance by distributing swap space over multiple storage
devices, particularly on systems with fast drives, controllers, and interfaces.
• A PPC PReP boot partition on the first partition of the hard drive — the PPC PReP boot partition
contains the YABOOT boot loader (which allows other POWER systems to boot Red Hat Enterprise
Linux). Unless you plan to boot from a floppy or network source, you must have a PPC PReP boot
partition to boot Red Hat Enterprise Linux.
For IBM System i and IBM System p users:
The PPC PReP boot partition should be between 4-8
MB, not to exceed 10 MB.
• A
/boot/
partition (100 MB) — the partition mounted on
/boot/
contains the operating system
kernel (which allows your system to boot Red Hat Enterprise Linux), along with files used during
the bootstrap process. Due to the limitations of most PC firmware, creating a small partition to hold
these is a good idea. For most users, a 100 MB boot partition is sufficient.
Warning
If you have a RAID card, be aware that Red Hat Enterprise Linux 5.5 does not support
setting up hardware RAID on an IPR card. If you already have the RAID array setup,
Open Firmware does not support booting from the RAID card. In cases such as these,
the
/boot/
partition must be created on a partition outside of the RAID array, such as
on a separate hard drive.