Dell PowerEdge T140 EMC PowerEdge Servers Troubleshooting Guide - Page 107

Foreign drivers on physical disk, Importing Foreign Configurations, Physical disk reported as Foreign

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The RAID configuration is applied to the virtual disks. To create virtual disks using RAID configuration at the preferred RAID level, watch the Dell Lifecycle Controller RAID configuration video on YouTube https://www.youtube.com/watch?v=JFPmeHNENV4 Foreign drivers on physical disk Importing Foreign Configurations NOTE: To make the foreign configuration effective, ensure that you have installed the latest version of Server Administrator. For more information, see the Dell EMC OpenManage Software Support Matrix available on the support site. You can import a foreign configuration only if it contains a virtual disk that is either in a Ready or Degraded state. In other words, all of the virtual disk data must be present, but if the virtual disk is using a redundant RAID level, the additional redundant data is not required. For example, if the foreign configuration contains only one side of a mirror in a RAID 1 virtual disk, then the virtual disk is in a Degraded state and can be imported. On the other hand, if the foreign configuration contains only one physical disk that was originally configured as a RAID 5 using three physical disks, then the RAID 5 virtual disk is in a Failed state and cannot be imported. In addition to virtual disks, a foreign configuration may consist of a physical disk that was assigned as a hot spare on one controller and then moved to another controller. The Import Foreign Configuration task imports the new physical disk as a hot spare. If the physical disk was set as a dedicated hot spare on the previous controller, but the virtual disk to which the hot spare was assigned is no longer present in the foreign configuration, then the physical disk is imported as a global hot spare. The Import Foreign Configuration task is only displayed when the controller has detected a foreign configuration. You can also identify whether a physical disk contains a foreign configuration (virtual disk or hot spare) by checking the physical disk state. If the physical disk state is Foreign, then the physical disk contains all or some portion of a virtual disk or has a hot-spare assignment. Setting the check consistency rate The Set Check Consistency Rate task changes the amount of system resources dedicated to the check the consistency rate. The check consistency rate, configurable between 0% and 100%, represents the percentage of the system resources dedicated for running the check consistency task. At 0%, the check consistency has the lowest priority for the controller, takes maximum time to complete, and has least impact to system performance. A check consistency rate of 0% does not mean that the check consistency is stopped or paused. At 100%, the check consistency is the highest priority for the controller. The check consistency time is minimized and has most impact to system performance. Performing a Consistency Check The Check Consistency task verifies the accuracy of the redundant (parity) information. This task only applies to redundant virtual disks. When necessary, the Check Consistency task rebuilds the redundant data. If the virtual disk is in a Failed Redundancy state, running a check consistency may be able to return the virtual disk to a Ready state. Physical disk reported as Foreign This topic describes the scenarios when a disk that is part of a RAID array may be reported as Foreign. A physical disk state may be displayed as Foreign if • The disk is located out of the array for an extended period of time • The disk is removed out of the array and reseated Server management software issues 107

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The RAID
configuration
is applied to the virtual disks.
To create virtual disks using RAID
configuration
at the preferred RAID level, watch the Dell Lifecycle Controller RAID
configuration
video on
YouTube
Foreign drivers on physical disk
Importing Foreign
Configurations
NOTE:
To make the foreign
configuration
effective,
ensure that you have installed the latest version of Server Administrator. For
more information, see the
Dell EMC OpenManage Software Support Matrix
available on the support site.
You can import a foreign
configuration
only if it contains a virtual disk that is either in a Ready or Degraded state. In other words, all of the
virtual disk data must be present, but if the virtual disk is using a redundant RAID level, the additional redundant data is not required.
For example, if the foreign
configuration
contains only one side of a mirror in a RAID 1 virtual disk, then the virtual disk is in a Degraded state
and can be imported. On the other hand, if the foreign
configuration
contains only one physical disk that was originally
configured
as a RAID
5 using three physical disks, then the RAID 5 virtual disk is in a Failed state and cannot be imported.
In addition to virtual disks, a foreign
configuration
may consist of a physical disk that was assigned as a hot spare on one controller and then
moved to another controller. The Import Foreign
Configuration
task imports the new physical disk as a hot spare. If the physical disk was
set as a dedicated hot spare on the previous controller, but the virtual disk to which the hot spare was assigned is no longer present in the
foreign
configuration,
then the physical disk is imported as a global hot spare.
The Import Foreign
Configuration
task is only displayed when the controller has detected a foreign
configuration.
You can also identify
whether a physical disk contains a foreign
configuration
(virtual disk or hot spare) by checking the physical disk state. If the physical disk
state is Foreign, then the physical disk contains all or some portion of a virtual disk or has a hot-spare assignment.
Setting the check consistency rate
The Set Check Consistency Rate task changes the amount of system resources dedicated to the check the consistency rate.
The check consistency rate,
configurable
between 0% and 100%, represents the percentage of the system resources dedicated for running
the check consistency task. At 0%, the check consistency has the lowest priority for the controller, takes maximum time to complete, and
has least impact to system performance. A check consistency rate of 0% does not mean that the check consistency is stopped or paused.
At 100%, the check consistency is the highest priority for the controller. The check consistency time is minimized and has most impact to
system performance.
Performing a Consistency Check
The Check Consistency task
verifies
the accuracy of the redundant (parity) information. This task only applies to redundant virtual disks.
When necessary, the Check Consistency task rebuilds the redundant data. If the virtual disk is in a Failed Redundancy state, running a
check consistency may be able to return the virtual disk to a Ready state.
Physical disk reported as Foreign
This topic describes the scenarios when a disk that is part of a RAID array may be reported as Foreign.
A physical disk state may be displayed as
Foreign
if
•
The disk is located out of the array for an extended period of time
•
The disk is removed out of the array and reseated
Server management software issues
107