Download  Print this page

Background Array Scan; Checkpointing; Virtual Disk Cache Policies - Dell PowerEdge S130 User Manual

Hide thumbs

Advertisement

Background Array Scan

Verifies and rectifies correctable media errors on mirror, volume, or parity data for virtual disks. Background Array Scan (BAS) starts
automatically after a virtual disk is created while in the operating system.

Checkpointing

Allows different types of checkpointing (BGI, CC, and rebuild) to resume at the last point following a restart. After the system
restarts, background checkpointing resumes at its most recent checkpoint.
The following are the three checkpoint features:
Consistency Check (CC)
Back Ground Initialization (BGI)
Rebuild
Consistency Check
Consistency check (CC) is a background operation that verifies and corrects the mirror or parity data for fault-tolerant physical disks.
It is recommended that you periodically run a consistency check on the physical disks.
By default, CC corrects mirror or parity inconsistencies. After the data is corrected, the data on the primary physical disk in a mirror
set is assumed to be the correct data and is written to the secondary physical disk, mirror set.
CC reports data inconsistencies through an event notification. A CC cannot be user-initiated in the BIOS Configuration Utility
(<Ctrl><R>). However, CC can be initiated using Dell OpenManage Server Administrator Storage Management. For more
infromation about Dell OMSA user's guide at dell.com/openmanagemanuals.
Background Initialization
BGI of a redundant virtual disk creates the parity data that allows the virtual disk to maintain its redundant data and survive a
physical disk failure. Similar to consistency check (CC), BGI helps the controller to identify and correct problems that might occur
with the redundant data at a later time.
CAUTION: Data is lost if a physical disk fails before the completion of a BGI.
BGI allows a redundant virtual disk to be used immediately.
NOTE: Although a BGI is software-initiated at the BIOS Configuration Utility (<Ctrl><R>), the PERC S130 drivers must
be loaded before the BGI runs.
Automatic virtual disk rebuild
Rebuilds a redundant virtual disk automatically when a failure is detected, if a hot spare is assigned for this capability.

Virtual disk cache policies

The PERC S130 uses part of system memory for cache. It supports the following cache options:
Read Ahead/Write Back
No Read Ahead/Write Back
Read Ahead/Write Through
No Read Ahead/Write Through
14

Hide quick links:

Advertisement

loading

  Related Manuals for Dell PowerEdge S130

This manual is also suitable for:

Perc s130