226 IBM System x3850 X6 and x3950 X6 Planning and Implementation Guide
Offline:
A drive that is part of a virtual drive but which has invalid data as far as the RAID
configuration is concerned.
7.7.3 Virtual drive states
A virtual drive is a partition in a drive group that is made up of contiguous data segments on
the drives.
There are multiple virtual drive states. The following list describes all of the possible virtual
drive states:
Optimal:
The virtual drive operating condition is good. All configured drives are online.
Degraded:
The virtual drive operating condition is not optimal. One of the configured drives has failed
or is offline.
Partially Degraded:
The operating condition in a RAID-6 virtual drive is not optimal. One of the configured
drives has failed or is offline.
Failed:
The virtual drive has failed.
Offline:
The virtual drive is not available to the RAID controller.
7.7.4 MegaCLI utility for storage management
In this section, we provide an overview of the MegaCLI utility. For more information, see the
Installation and User’s Guide at the following website:
http://ibm.com/support/entry/portal/docdisplay?lndocid=SERV-RAID
The MegaCLI utility is a command-line interface application. You can use this utility to
configure, monitor, and maintain ServeRAID SAS RAID controllers and the devices that
connect to them.
Creating a virtual drive with command-line interface (CLI)
In this example, we have two hard drives in slots one and two. Both hard drives must be in
Unconfigured Good state as seen in Figure 5-25 on page 154.
Follow these steps to create a virtual drive with the CLI:
1. Use the following command to locate the Enclosure Device ID and the Slot Number of
both hard drives:
MegaCli -PDList -aAll
2. Now we can create the virtual drive. In our example, we issue the following command to
create a RAID-1:
MegaCli -CfgLDAdd -R1[252:1,252:2] -a0
Example 7-6 shows the resulting output.
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