- Introduction
- RAID 0
- Problem
- Resolution
- Configuring RAID Using the WebBIOS on E-Series
- Related Information
Introduction
RAID is an array, or group, of multiple independent physical drives that provide high performance and fault tolerance. A RAID drive group improves input/output (I/O) performance and reliability. The RAID drive group appears to the host computer as a single storage unit or as multiple virtual units. RAID levels describe a system for ensuring the availability and redundancy of data stored on large disk subsystems. A drive group is a group of physical drives. These drives are managed in partitions known as virtual drives. A virtual drive is a partition in a drive group that is made up of contiguous data segments on the drives. A virtual drive can consist of an entire drive group, more than one entire drive group, a part of a drive group, parts of more than one drive group, or a combination of any two of these conditions.
RAID 0
RAID 0 uses striping to provide high data throughput, especially for large files in an environment that does not require fault tolerance. Disk striping involves partitioning each drive storage space into stripes that can vary in size from 8 KB to 1024 KB. These stripes are interleaved in a repeated sequential manner. The combined storage space is composed of stripes from each drive. RAID 0 does not provide any data redundancy but does offer the best performance of any RAID level. RAID 0 breaks up data into smaller segments and stripes the data segments across each drive in the drive group.
Problem
Checking the server through CIMC it was found that the status of the Physical Drive 2 was showing “Foreign Config.” And the health as “Moderate Fault”. There are two Hard disks in RAID 0 group and one of those is Physical Drive 2, which has the problem. After replacing this hard disk the status of the Physical Hard disk is showing as “UnConfigured” but the Health status is “Good”.
Resolution
RAID 0 does not support disk failures. You need to take both disks and configure them for RAID 0 again and then install the OS.
Configuring RAID Using the WebBIOS on E-Series
Follow these steps to configure RAID using the WebBIOS:
Step 1 In the Navigation pane, click the Server tab.
Step 2 On the Server tab, click Summary.
Step 3 From the Actions area, click Launch KVM Console.
The KVM Console opens in a separate window.
Step 4 From the Server Summary page, click Power Cycle Server to reboot the server.
Step 5 Press the Ctrl key, and then press H during bootup to access the WebBIOS.
Related Information
Cisco UCS Servers RAID Guide
Managing RAID
UCS C220 giving long beeps, Hardisk replaced
