Users Guide

SAS RAID Controllers
The following RAID controllers use Serial Attached SCSI (SAS) technology.
• PERC S140
• PERC H730P MX
• PERC H745P MX
RAID Controller Features
Dierent controllers have dierent features. If you have more than one controller attached to your system, you may notice that the tasks
displayed on the Information/Conguration page of the controller are dierent for each controller.
Controllers may also have dierences in their read, write, and cache policies as well as how they handle hot spares. You should be aware of
these dierences when creating virtual disks and assigning hot spares.
The following describes some of the RAID controller features and provides links to a more detailed explanation. For information on the
features supported by the controllers, see Supported Features.
• Hot spares — On RAID controllers, a hot spare is a backup for a disk that fails. See Protecting Your Virtual Disk With A Hot Spare.
• Rebuilding data — You can rebuild data from a failed physical disk if the disk is a member of a redundant virtual disk. See Rebuilding
Redundant Information.
• Virtual disk expansion — Virtual disk expansion enables you to expand the capacity of a virtual disk while it remains online by adding
additional disks to the virtual disk. This feature is also known as online capacity expansion (OLCE). See Virtual Disk Tasks.
• RAID migration — After creating a virtual disk, you can change the RAID level. See Reconguring Or Migrating Virtual Disks.
• Moving physical and virtual disks to another controller — This feature enables you to move the physical and virtual disks from one
system to another. See Moving Physical And Virtual Disks From One System To Another.
• Read, write, and cache policies — The manner in which a controller reads and writes data can vary. The read, write, and cache policies
have implications for data encryption and system performance. See RAID Controller Read, Write, Cache, And Disk Cache Policy.
• Check consistency — A check consistency determines the integrity of the redundant data on a virtual disk. When necessary, this
feature rebuilds the redundant information. See Maintaining The Integrity Of Redundant Virtual Disks.
• Patrol Read — Patrol read identies disk errors to avoid disk failures, data loss, or corruption. For more information, see Setting The
Patrol Read Mode.
• Disk migration or foreign congurations — Some controllers enable you to move physical disks that contain one or more virtual disks to
another controller. The receiving controller is able to recognize and import the foreign conguration (virtual disks). For more
information, see Foreign Conguration Operations.
Controller — Supported RAID Levels
RAID controllers may support dierent RAID levels. For information on supported RAID levels for a controller, see Supported Features.
Controller — Supported Stripe Sizes
When creating a virtual disk, you must specify the stripe size for the virtual disk. Dierent controllers have dierent limitations on the stripe
sizes they can support. For information on the supported stripe sizes for a controller, see the virtual disk specications section for the
controller in Supported Features.
Controllers
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