Users Guide

Table Of Contents
Edit Disk capacity
Online Capacity Expansion (OCE) allows you to increase the storage capacity of selected RAID levels while the system remains
online. The controller redistributes the data on the array(called Reconfiguration), placing new space available at the end of each
RAID array.
Online Capacity Expansion (OCE) can be achieved in two ways:
โ— If free space is available on the smallest physical drive on the virtual disks group after starting LBA of Virtual disks, the
virtual diskยดs capacity can be expanded within that free space. This option allows you to enter the new increased virtual disk
size. If disk group in a virtual disk has space available only before starting LBA, then Edit Disk Capacity in same disk group is
not permitted even though there is Available Space on a physical drive.
โ— A virtual disk's capacity can also be expanded by adding additional compatible physical disks to the existing virtual disk group.
This option does not allow you to enter the new increased virtual disk size. New increased virtual disk size is calculated and
displayed to the user based on the used disk space of existing physical disk group on a particular virtual disk, existing raid
level of the virtual disk and the number of new drives added to the virtual disk.
Capacity Expansion allows user to specify the final VD size. Internally final VD size is conveyed to PERC in percentage (this
percentage is the space user would like to use from empty space left in the array for the local disk to expand). Because of this
percentage logic final VD size after reconfiguration completes may be different from what user provided for scenario where user
is not giving maximum VD size possible as the final VD size (percentage turns out to be less than 100%). User does not see
difference in this entered VD size and final VD size after reconfiguration, if maximum possible VD size is entered by user.
Raid Level Migration
RAID Level Migration (RLM) refers to changing a virtual diskยดs RAID level. iDRAC9 provides an option to increase the VD size
using RLM. In a way, RLM allows migrating the RAID level of a virtual disk which in turn may increase the size of virtual disk.
RAID level migration is the process of converting a VD with one RAID Level to another. When you migrate a VD to a different
Raid Level, the user data on it is redistributed to the format of the new configuration.
This configuration is supported by both staged and realtime.
The below table describes possible reconfigurable VD layouts while reconfiguring (RLM) a VD with addition of disks and without
addition of disks.
Table 54. Possible VD Layout
Source VD Layout Possible target VD Layout with Disk
Add
Possible target VD Layout Without
disk addition
R0 (single disk) R1 NA
R0 R5/R6 NA
R1 R0/R5/R6 R0
R5 R0/R6 R0
R6 R0/R5 R0/R5
Permitted operations when OCE or RLM is going on
The following operations are allowed when OCE/RLM is going on:
Table 55. Permitted operations
From Controller End behind
which a VD is going
through OCE/RLM
From VD End (which is
going through OCE/RLM)
From any other Ready
State Physical Disk on the
same controller
From any other VD (which
is not going through OCE/
RLM) End on the same
controller
Reset Configuration Delete Blink Delete
Export Log Blink Unblink Blink
246 Managing storage devices