Red Hat ENTERPRISE LINUX 4 - INTRODUCTION TO SYSTEM ADMINISTRATION Administration Manual

Also see for ENTERPRISE LINUX 4 - DEVELOPER TOOLS GUIDE: Installation guide Installation guide Tuning guide Installation guide Manual

Contents

108 Chapter 5. Managing Storage• Making sure that the disk quotas remain accurateCreating a disk usage report entails running the repquota utility program. Using the commandrepquota /home produces this output:*** Report for user quotas on device /dev/md3Block grace time: 7days; Inode grace time: 7daysBlock limits File limitsUser used soft hard grace used soft hard grace----------------------------------------------------------------------root -- 32836 0 0 4 0 0matt -- 6618000 6900000 7000000 17397 0 0More information about repquota can be found in the Red Hat Enterprise Linux System Administra-tion Guide, in the chapter on disk quotas.Whenever a file system is not unmounted cleanly (due to a system crash, for example), it is necessaryto run quotacheck. However, many system administrators recommend running quotacheck on aregular basis, even if the system has not crashed.The process is similar to the initial use of quotacheck when enabling disk quotas.Here is an example quotacheck command:quotacheck -avugThe easiest way to run quotacheck on a regular basis is to use cron. Most system administratorsrun quotacheck once a week, though there may be valid reasons to pick a longer or shorter interval,depending on your specific conditions.5.9.8. Creating RAID ArraysIn addition to supporting hardware RAID solutions, Red Hat Enterprise Linux supports softwareRAID. There are two ways that software RAID arrays can be created:• While installing Red Hat Enterprise Linux• After Red Hat Enterprise Linux has been installedThe following sections review these two methods.5.9.8.1. While Installing Red Hat Enterprise LinuxDuring the normal Red Hat Enterprise Linux installation process, RAID arrays can be created. This isdone during the disk partitioning phase of the installation.To begin, you must manually partition your disk drives using Disk Druid. You must first create a newpartition of the type "software RAID." Next, select the disk drives that you want to be part of theRAID array in the Allowable Drives field. Continue by selecting the desired size and whether youwant the partition to be a primary partition.Once you have created all the partitions required for the RAID array(s) that you want to create, youmust then use the RAID button to actually create the arrays. You are then presented with a dialog boxwhere you can select the array’s mount point, file system type, RAID device name, RAID level, andthe "software RAID" partitions on which this array is to be based.Once the desired arrays have been created, the installation process continues as usual.