3-6 Dell PowerVault 720N, 740N, and 760N System Administrator and Command Reference Guide
The sysconfig -r command displays which disk is reserved as the hot spare disk.
In addition to disk failure and hot spare disk replacement activity, the
/etc/messages
file logs any failure in a periodic check of the hot spare disk.
Command to control RAID data reconstruction speed: You can control the speed
of RAID data reconstruction by entering the following command:
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where speed is a number ranging from 1 (slowest) to 10 (fastest). Because RAID data
reconstruction consumes CPU time, sometimes increasing the speed of data recon-
struction slows the filers network operations. The default speed is 4, which means
approximately 40% of the CPU time is used for RAID data reconstruction.
When RAID data reconstruction is in progress, use the sysstat command to check
the system load on the filer. If the load is light, increase the speed of RAID data recon-
struction to maximize CPU utilization. For more information about the sysstat
command, refer to the section, Displaying Filer Statistics, in Chapter 17.
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This section covers the following topics:
Understanding volumes
Determining the number of volumes to use
Planning a multiple volume configuration
Installing a foreign volume
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Data on the filer is organized in volumes. A volume is an independent file system with
its own RAID groups.
The initial configuration for new filers running includes one 2- to 14-disk volume (a root
file system). All remaining disks are spares.
Volume naming conventions: You choose the volume names. The names must fol-
low these naming conventions:
begin with either a letter or an underscore (_)
contain only letters, digits, and underscores
contain no more than 255 characters
The root volume: Each filer must have a root volume to boot. The root volume of a
filer (configured with either a single volume or multiple volumes) is the volume whose
/etc directory is used by the filer for configuration information.