Dell PowerEdge R7525 EMC PowerEdge RAID Controller S150 Users Guide - Page 15

Virtual disk migration, Migrating a virtual disk, Expanding virtual disk capacity

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• No Read Ahead/Write Back • Read Ahead/Write Through • No Read Ahead/Write Through Table 6. Read, Write, and Cache Policy for the PERC S150 Category Supported by S150 controller Cache settings Yes Read Ahead/Write Back Yes No Read Ahead/Write Back Yes Read Ahead/Write Through Yes No Read Ahead/Write Through Yes NOTE: The current default for Write-Cache mode enablement is No Read Ahead, Write Through (NRA, WT). To enable Write Back (WB), a UPS is recommended. NOTE: For more information about the physical disk write cache policy behavior, see Troubleshooting your system on page 42. Virtual disk migration The PERC S150 supports automatic virtual disk migration from one PERC S150 to another. CAUTION: The virtual disk is lost if you perform a virtual disk migration during an Online Capacity Expansion (OCE)/ Reconfigure. NOTE: Back up the virtual disk data before migrating virtual disks. NOTE: Ensure that all physical disks that are part of the virtual disk are migrated. Virtual disks in optimal and degraded states are automatically migrated. A virtual disk in an offline state should not be migrated. NOTE: A bootable virtual disk cannot be migrated between dissimilar system models. NOTE: When you migrate virtual disks, ensure that you verify that the number of virtual disks does not exceed 10. Migrating a virtual disk 1. Turn off the system that contains the source controller. 2. Turn off the target system if the system does not support hot swap of physical disks. 3. Move the appropriate physical disks from the source controller to the target controller in the target system. Physical disks do not have to be inserted into the same slots in the target system. 4. If the target system was turned off, turn on the system. CAUTION: The BIOS Configuration Utility pauses, and prompts for action, for the degraded virtual disk(s), if the "pause if degraded" option is enabled in the BIOS Configuration Utility. CAUTION: After the migration occurs, ensure that all of the physical disks have been migrated and are present in the appropriate virtual disks. Expanding virtual disk capacity The capacity of a virtual disk can be expanded online by using the Online Capacity Expansion/Reconfigure (OCE/Reconfigure). OCE/ Reconfigure is a process that allows you to add storage capacity to an existing virtual disk. In most cases additional storage capacity can be added without taking the system offline. Virtual Disks 15

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No Read Ahead/Write Back
•
Read Ahead/Write Through
•
No Read Ahead/Write Through
Table 6. Read, Write, and Cache Policy for the PERC S150
Category
Supported by S150 controller
Cache settings
Yes
Read Ahead/Write Back
Yes
No Read Ahead/Write Back
Yes
Read Ahead/Write Through
Yes
No Read Ahead/Write Through
Yes
NOTE:
The current default for Write-Cache mode enablement is No Read Ahead, Write Through (NRA, WT). To enable
Write Back (WB), a UPS is recommended.
NOTE:
For more information about the physical disk write cache policy behavior, see
Troubleshooting your system
on
page 42.
Virtual disk migration
The PERC S150 supports automatic virtual disk migration from one PERC S150 to another.
CAUTION:
The virtual disk is lost if you perform a virtual disk migration during an Online Capacity Expansion (OCE)/
Reconfigure.
NOTE:
Back up the virtual disk data before migrating virtual disks.
NOTE:
Ensure that all physical disks that are part of the virtual disk are migrated. Virtual disks in optimal and degraded
states are automatically migrated. A virtual disk in an offline state should not be migrated.
NOTE:
A bootable virtual disk cannot be migrated between dissimilar system models.
NOTE:
When you migrate virtual disks, ensure that you verify that the number of virtual disks does not exceed 10.
Migrating a virtual disk
1.
Turn off the system that contains the source controller.
2.
Turn off the target system if the system does not support hot swap of physical disks.
3.
Move the appropriate physical disks from the source controller to the target controller in the target system.
Physical disks do not have to be inserted into the same slots in the target system.
4.
If the target system was turned off, turn on the system.
CAUTION:
The BIOS Configuration Utility pauses, and prompts for action, for the degraded virtual disk(s), if the "pause
if degraded" option is enabled in the BIOS Configuration Utility.
CAUTION:
After the migration occurs, ensure that all of the physical disks have been migrated and are present in the
appropriate virtual disks.
Expanding virtual disk capacity
The capacity of a virtual disk can be expanded online by using the Online Capacity Expansion/Reconfigure (OCE/Reconfigure). OCE/
Reconfigure is a process that allows you to add storage capacity to an existing virtual disk. In most cases additional storage capacity can
be added without taking the system offline.
Virtual Disks
15