IBM 46M0830 Manual De Usuario
ServeRAID M5025 SAS/SATA Controller for IBM System x
3
Features
The ServeRAID M5025 adapter card has the following features:
Auto-resume on array rebuild or array reconstruction after loss of system power
Auto-resume uses non-volatile NVRAM to save rebuild progress during a host reboot or power failure
to automatically resume from the last checkpoint. Auto-resume will ensure data integrity is maintained
through the process. The card supports a number of features that can be implemented without
rebooting the server. Applications such as email and web server benefit from avoiding downtime
during transition.
through the process. The card supports a number of features that can be implemented without
rebooting the server. Applications such as email and web server benefit from avoiding downtime
during transition.
Online Capacity Expansion
Online Capacity Expansion (OCE) allows the capacity of a virtual disk to be expanded by adding new
physical disks or making use of unused space on existing disks, without requiring a reboot.
Online RAID Level Migration
Online RAID Level Migration (also known as logical drive migration) provides the ability to migrate a
virtual disk from any RAID level to any other RAID level without requiring a reboot. System availability
and application functionality remain unaffected.
and application functionality remain unaffected.
Fast initialization for quick array setup
Consistency check for background data integrity
Consistency Check verifies that all stripes in a virtual disk with a redundant RAID level are consistent.
For RAID 1, the consistency check will mirror data when an inconsistent stripe is detected. For RAID
5 or RAID 6, the consistency check will recreate the parity from the peer disks. Consistency checks
can be scheduled to take place periodically.
5 or RAID 6, the consistency check will recreate the parity from the peer disks. Consistency checks
can be scheduled to take place periodically.
Extensive online configuration options: advanced monitoring and event notification
Management tools provide convenience for configuration of logical volumes and alerts when errors
have occurred or are about to occur.
Patrol Read for media scanning and repairing
Patrol read is a background sentry service designed to proactively discover and correct media defects
(bad sectors) that arise normally as a disk drive ages. The service issues a series of verify commands
and if a bad block is discovered, the card's firmware will use RAID algorithms to recreate the missing
data and remap the sector to a good sector. The task is interruptible based on controller activity and
host operations. The firmware also provides an interface where the patrol read task can be initiated,
set up for continuous operation, and terminated from a management application. Patrol read can be
activated by manual command or automatically.
and if a bad block is discovered, the card's firmware will use RAID algorithms to recreate the missing
data and remap the sector to a good sector. The task is interruptible based on controller activity and
host operations. The firmware also provides an interface where the patrol read task can be initiated,
set up for continuous operation, and terminated from a management application. Patrol read can be
activated by manual command or automatically.
Global and dedicated Hot Spare with Revertible Hot Spare support:
A hot spare rebuilds data from all virtual disks within the disk group in which it is configured.
ServeRAID provides the ability to define a physical disk as a hot spare to replace a failed drive. Hot
spares can be configured as either global or dedicated. A global hot spare allows any physical drive to
be designated as a hot spare. A dedicated hot spare will allow the user to assign a hot spare drive to
a particular array of the same drive type.
spares can be configured as either global or dedicated. A global hot spare allows any physical drive to
be designated as a hot spare. A dedicated hot spare will allow the user to assign a hot spare drive to
a particular array of the same drive type.