Dell PowerEdge T140 EMC PowerEdge Servers Troubleshooting Guide - Page 72

Rebuild, Rebuilding the physical disks after multiple disks become simultaneously inaccessible

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4 Select Create New VD, and set the Secure VD option as Yes. Next step NOTE: To select or configure a non-SED, you must create an unsecured virtual disk. You can create an unsecured virtual disk even if there is a security key. From the Create New VD menu, select the Secure VD option as No. For more information about creating a virtual disk, see the Dell PowerEdge RAID Controller (PERC) User's Guide at Dell.com/ storagecontrollermanuals. Rebuild Select Rebuild to rebuild one or more failed physical disks. Several of the controller configuration settings and the virtual disk settings affect the actual rate of rebuild. The factors include the rebuild rate setting, virtual disk stripe size, virtual disk read policy, virtual disk write policy, and the amount of workload placed on the storage subsystem. For information on getting the best rebuild performance from your RAID controller, see the documentation at Dell.com/ storagecontrollermanuals. The listed rates in the following table were taken during single disk failure with no I/O. Rates vary depending on type, speed and number of hard drives present in array; as well as which controller model and enclosure configuration are being used. Table 17. Estimated rebuild rates RAID level Number of Hard Drives RAID 1 2 RAID 5 6 RAID 10 6 RAID 5 24 RAID 10 24 7.2 K rpm 12 Gbps SAS Hard Drive 320 GB/hour 310 GB/hour 320 GB/hour 160 GB/hour 380 GB/hour 15 K rpm 6 Gbps SAS Hard Drive 500 GB/hour 480 GB/hour 500 GB/hour 240 GB/hour 500 GB/hour Rebuilding the physical disks after multiple disks become simultaneously inaccessible About this task Multiple physical disk errors in a single array typically indicate a failure in cabling or connection and could involve the loss of data. You can recover the virtual disk after multiple physical disks become simultaneously inaccessible. Perform the following steps to recover the virtual disk: Steps 1 Turn off the system, check cable connections, and reseat physical disks. 2 Ensure that all the drives are present in the enclosure. 3 Turn on the system and enter the CTRL+R utility and import the foreign configuration. Press at the prompt to import the configuration, or press to enter the BIOS configuration utility and either import or clear the foreign configuration. 4 If the virtual disk is redundant and transitioned to Degraded state before going Offline, a rebuild operation starts automatically after the configuration is imported. 5 If the virtual disk has gone directly to the Offline state due to a cable pull or power loss situation, the virtual disk is imported in its Optimal state without a rebuild occurring. 6 You can use the BIOS Configuration Utility or Dell OpenManage storage management application to perform a manual rebuild of multiple physical disks. 72 Troubleshooting hardware issues

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4
Select
Create New VD
, and set the
Secure VD
option as
Yes
.
Next step
NOTE:
To select or
configure
a non-SED, you must create an unsecured virtual disk. You can create an unsecured virtual disk even if there is a
security key. From the
Create New VD
menu, select the
Secure VD
option as
No
.
For more information about creating a virtual disk, see the
Dell PowerEdge RAID Controller (PERC) User’s Guide
at
Dell.com/
storagecontrollermanuals
.
Rebuild
Select Rebuild to rebuild one or more failed physical disks.
Several of the controller
configuration
settings and the virtual disk settings
affect
the actual rate of rebuild. The factors include the rebuild
rate setting, virtual disk stripe size, virtual disk read policy, virtual disk write policy, and the amount of workload placed on the storage
subsystem. For information on getting the best rebuild performance from your RAID controller, see the documentation at
Dell.com/
storagecontrollermanuals
.
The listed rates in the following table were taken during single disk failure with no I/O. Rates vary depending on type, speed and number of
hard drives present in array; as well as which controller model and enclosure
configuration
are being used.
Table 17. Estimated rebuild rates
RAID level
Number of Hard Drives
7.2 K rpm 12 Gbps SAS Hard
Drive
15 K rpm 6 Gbps SAS Hard
Drive
RAID 1
2
320 GB/hour
500 GB/hour
RAID 5
6
310 GB/hour
480 GB/hour
RAID 10
6
320 GB/hour
500 GB/hour
RAID 5
24
160 GB/hour
240 GB/hour
RAID 10
24
380 GB/hour
500 GB/hour
Rebuilding the physical disks after multiple disks become simultaneously inaccessible
About this task
Multiple physical disk errors in a single array typically indicate a failure in cabling or connection and could involve the loss of data. You can
recover the virtual disk after multiple physical disks become simultaneously inaccessible.
Perform the following steps to recover the virtual disk:
Steps
1
Turn
off
the system, check cable connections, and reseat physical disks.
2
Ensure that all the drives are present in the enclosure.
3
Turn on the system and enter the
CTRL+R
utility and import the foreign
configuration.
Press
<"F">
at the prompt to import the
configuration,
or press
<"C">
to enter the BIOS
configuration
utility and either import or clear the foreign
configuration.
4
If the virtual disk is redundant and transitioned to Degraded state before going
Offline,
a rebuild operation starts automatically after the
configuration
is imported.
5
If the virtual disk has gone directly to the
Offline
state due to a cable pull or power loss situation, the virtual disk is imported in its
Optimal state without a rebuild occurring.
6
You can use the BIOS
Configuration
Utility or Dell OpenManage storage management application to perform a manual rebuild of
multiple physical disks.
72
Troubleshooting hardware issues