Table of Contents
Advertisement
After getting an IP address and logging into the ATTO ExpressNAV System Manager, you have options to map
devices so that the FibreBridge can access the devices in your network.
The ATTO FibreBridge allows parallel SAS/SATA
devices to participate in a Fibre Channel arbitrated
loop or on a fabric. Fibre Channel and SAS/SATA use
different models to address devices. The FibreBridge
translates between these addressing models.
FibreBridge mapping
On a Fibre Channel Arbitrated Loop, the FibreBridge
appears at a single Arbitrated Loop Port Address
(AL_PA). Each device on an arbitrated loop is
assigned a unique AL_PA during loop initialization.
The FibreBridge supports both modes of AL_PA
assignment, commonly referred to as hard and soft
addressing.
Note
Fibre Channel Arbitrated Loop technology is
only available for 4Gb/s and 8Gb/s.
WWN: to identify each Fibre Channel device while
addressing, each Fibre Channel device is assigned a
unique World Wide Name (WWN). The 64-bit WWN
has the following format:
Field
WWN
Company ID
Name
Format
Byte
0
1
2
Value
20
00
00
Soft addressing allows the loop initialization master
to assign the FibreBridge a unique address during the
loop initialization process. The address assigned
cannot be determined before loop initialization. Adding
new devices to an arbitrated loop may change the
address assigned to the FibreBridge.
Hard addressing allows a predetermined address to
be assigned to the FibreBridge. The FibreBridge tries
to acquire the desired hard address. If another device
has already been assigned the specified address, the
FibreBridge acquires a currently unassigned address.
Note
The default mode is soft addressing.
SAS/SATA device mapping
SAS/SATA devices connected to the FibreBridge are
viewed as Fibre Channel LUNs to the host computer.
8
ATTO Technology Inc. FibreBridge Installation and Operation Manual
3.1 Map Devices
Device ID
3
4
5
6
7
10
86
xx
xx
xx
The ATTO ExpressNAV interface displays the current
mapping information for SAS/SATA devices. Refer to
5.0 Interface options
on page 14.
Note
SCSI commands sent to offline devices are
rejected.
RAID device mapping
When using the FibreBridge 7500 with a device that
supports multiple LUNs behind a target, such as a
RAID array, you must disable SAS Mapping by
Topology.
1
If you are not already in the ExpressNAV
interface, type the IP address of your
FibreBridge into a standard browser
2
Click on the Advanced menu item on the left
side of the screen
3
The Advanced CLI Configuration page
appears
4
Type Set SASMapByTopology disabled
5
Type SaveConfiguration restart
Once the FibreBridge restarts, any attached RAID
devices will be scanned and all LUNs will be mapped.
Note
If SASMapByTopology is enabled, RAID
Processor LUNs will be mapped, but not RAID
Groups. Alternatively, you may connect to the
CLI via the FibreBridge serial port and issue
the above commands.
Drive Map Director
Drive Map Director uses SMP to provide a predictable
mapping structure for devices attached to the
FibreBridge 7500. To use this feature, drive
enclosures must support SAS expanders with SMP
protocol such as the HP StorageWorks D2700 SAS
JBOD. If SMP supporting expanders are not present in
your storage system the FibreBridge will revert to the
AutoMap feature (see
AutoMap
Mapping Devices with SMP
Drive Map Director assigns a Fibre target number to
each shelf of storage and a Fibre LUN is reserved for
each slot within the enclosure. This numbering
scheme is static and will remain with the shelf and slot
TM
devices).
Advertisement
Table of Contents
