Dell PowerVault MD1000 SAS Solution Manual - Halaman 15

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A REFERENCE GUIDE FOR OPTIMIZING DELL™ MD1000 SAS SOLUTIONS

5. PERC 5/E Controller - Detailed Features

PERC 5/E is the RAID controller used to connect the PowerVault MD1000 storage enclosure with

PowerEdge servers. It supports 3 Gbps Serial Attached SCSI (SAS) as the storage interconnect

technology and PCI -E as the host-based interconnect technology. PERC 5/E controller supports

RAID levels 0, 1, 5, 10 and 50.

The selection of a RAID solution in any environment is governed by several aspects including

controller and capacity requirements. Each of these factors is discussed in detail in the following

sections.

The Server Administrator is the recommended application for configuring and managing the

PowerVault MD1000 storage enclosure. Apart from the Server Administrator software, the BIOS

configuration utility (<CTRL> <R>) may be used to perform pre-OS configuration and fault

recovery. Some of the key features of the PERC 5/E controller are listed here:

Virtual Disk Initialization

•

PERC 5/E controller is capable of performing initialization on the virtual disk(s) by either

writing 0's to a portion of the physical disk (fast initialization) or to the entire physical disk

(full initialization). Full initialization guarantees that any legacy data is cleared and all

sectors are healthy.

Background Patrol Read

•

Background Patrol Read is an automatically scheduled background task that scans and

resolves possible physical disk errors that may lead to physical disk failure and result in

data integrity issues. Dell recommends implementing Background Patrol Read in all the

configurations.

Consistency Check/Background Initialization (BGI)

•

Consistency checks / BGI are performed by PERC 5/E controller to verify that all stripes in

a redundant virtual disk are consistent and to automatically correct stripes where

inconsistencies are found. BGI is a consistency check that automatically runs on all

redundant arrays. Depending on workload, Dell recommends that consistency checks are

run manually on virtual disks at least once every month to ensure data integrity. Running a

consistency check is complement to running Patrol Read and both should be used.

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