Users Guide

• Physical disk is in non-RAID mode. You must convert to RAID mode using iDRAC interfaces such as iDRAC web interface, RACADM,
WS-MAN, or <CTRL+R>.
NOTE: If you create a virtual disk in Add to Pending Operation mode and a job is not created, and then if you delete the Virtual
disk, then the create pending operation for the virtual disk is cleared.
Considerations before creating virtual disks
Before creating virtual disks, consider the following:
• Virtual disk names not stored on controller—The names of the virtual disks that you create are not stored on the controller. This means
that if you reboot using a dierent operating system, the new operating system may rename the virtual disk using its own naming
conventions.
• Disk grouping is a logical grouping of disks attached to a RAID controller on which one or more virtual disks are created, such that all
virtual disks in the disk group use all of the physical disks in the disk group. The current implementation supports the blocking of mixed
disk groups during the creation of logical devices.
• Physical disks are bound to disk groups. Therefore, there is no RAID level mixing on one disk group.
• There are limitations on the number of physical disks that can be included in the virtual disk. These limitations depend on the controller.
When creating a virtual disk, controllers support a certain number of stripes and spans (methods for combining the storage on physical
disks). Because the number of total stripes and spans is limited, the number of physical disks that can be used is also limited. The
limitations on stripes and spans aect the RAID levels as follows:
• Maximum number of spans aects RAID 10, RAID 50, and RAID 60.
• Maximum number of stripes aects RAID 0, RAID 5, RAID 50, RAID 6, and RAID 60.
• Number of physical disks in a mirror is always 2. This aects RAID 1 and RAID 10.
• Cannot create virtual disks on PCIe SSDs.
Creating virtual disks using web interface
To create virtual disk:
1 In the iDRAC Web interface, go to Overview > Storage > Virtual Disks > Create.
The Create Virtual Disk page is displayed.
2 In the Settings section, do the following:
a Enter the name for the virtual disk.
b From the Controller drop-down menu, select the controller for which you want to create the virtual disk.
c From the Layout drop-down menu, select the RAID level for the Virtual Disk.
Only those RAID levels supported by the controller appear in the drop-down menu and it is based on the RAID levels are available
based on the total number of physical disks available.
d Select the Media Type, Stripe Size, Read Policy, Write Policy, Disk Cache Policy, T10 PI Capability.
Only those values supported by the controller appear in the drop-down menus for these properties.
e In the Capacity eld, enter the size of the virtual disk.
The maximum size is displayed and then updated as disks are selected.
f The Span Count eld is displayed based on the selected physical disks (step 3). You cannot set this value. It is automatically
calculated after selecting disks for multi-raid level. If you have selected RAID 10 and if the controller supports uneven RAID 10,
then the span count value is not displayed. The controller automatically sets the appropriate value.
3 In the Select Physical Disks section, select the number of physical disks.
For more information about the elds, see the iDRAC Online Help
4 From the Apply Operation Mode drop-down menu, select when you want to apply the settings.
5 Click Create Virtual Disk.
Based on the selected Apply Operation Mode, the settings are applied.
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Managing storage devices