Dell DX6000G Kurulum ve Yapılandırma Kılavuzu - Sayfa 5
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Chapter 2. Installation and Guided Configuration
2.1. Requirements
2.1.1. Operating System
DX Storage CFS has been developed and tested with 64-bit Red Hat Enterprise Linux 6.0;
other RHEL versions or Linux distributions are not currently supported. Subsequent installation
instructions will assume a pre-installed RHEL environment with either internet connectivity or an
alternately configured RHEL yum repository for use in installing required 3rd party packages.
Warning
The recently added Red Hat 'hugepages' feature has been found to be incompatible with
CFS and other applications, often resulting in kernel hangs particularly under high stress
scenarios. As a result it is highly recommended that huge pages be disabled as follows
prior to installing and running CFS:
echo 'never' > /proc/sys/kernel/mm/redhat_transparent_hugepage/enabled
If the feature is not disabled, both CFS and CNS will log a warning at startup as an
additional reminder. For the changes to remain in effect with the next reboot, you must
add 'transparent_hugepage=never' to the existing kernel parameters in the /boot/grub/
menu.lst file prior to rebooting the CFS server.
Note
For optimal performance, it is highly recommended that the 'deadline' I/O scheduler be
utilized on the installed CFS server. The following command demonstrates how to enable
the deadline scheduler on an 'sda' disk:
echo deadline | sudo tee /sys/block/sda/queue/scheduler
For the changes to remain in effect with the next reboot, you must add 'elevator=deadline'
to the existing kernel parameters in the /boot/grub/menu.lst file prior to rebooting the CFS
server.
2.1.2. Recommended Network Infrastructure
A configured Network Time Protocol (NTP) server is strongly recommended to provide clock
synchronization services to DX Storage CFS, the name space server and the DX Storage cluster. A
common sense of time is especially important between CFS servers and the name space server if
the latter is configured remotely. To install a functional NTP configuration on RHEL, run the following
command as the root user:
# yum install ntp
Gigabit Ethernet or better is the recommended connection speed between DX Storage CFS and DX
Storage nodes.
2.1.3. Protecting Local Disk Resources
Red Hat 6 does not guarantee immediate write of data to disk with their default ext4 file system.
In order to ensure data security in the event of a system or power failure, it is therefore highly
recommended that administrators add the 'nodelalloc' mount option to several critical local
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Version 2.6
February 2011