Technical Product Specification

RAID Functionality and Features Intel® RAID Controller SRCSAS18E
Revision 1.01
Intel order number D61769-001
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4.1.2 RAID Virtual Drive Status
Table 11. RAID Virtual Drive Status
Drive State Code Description
Optimal Optimal The drive operating system is good. All configured drives are online.
Degraded Degraded The drive operating condition is not optimal because on of the configured drives has
failed or is offline.
Offline Offline The drive is not available to the operating system and is unusable.
4.1.3 RAID Controller Drive Limitations
Only drives complying with the SAS and SATA specifications extentions are supported.
4.2 SAS Bus and ID Mapping
Devices on a SAS bus may be mapped in one of several methods:
 Physically mapped based on the physical location (the controller phy they are connected
to).
 Persistent mapping based on a SAS address.
 A combination of the two methods.
Intel has chosen to physically map SAS devices.
4.2.1 Direct-attached Physically Mapped Devices
Physically mapped direct attached devices are mapped based upon the controller PHY that they
are connected to. If the device is removed and a different device is inserted into that locaton,
the new device will have the same bus/ID that the previous device had. This method more
closely follows the legacy SCSI numbering method.