Ds5100 And Ds5300 Storage Expansion Enclosure Id Settings; Best Practice Enclosure Id Settings Scheme - IBM DS5100 Installation, User's, And Maintenance Manual

DS5100 and DS5300 storage expansion enclosure ID settings

DS5100 and DS5300 storage expansion enclosures have an enclosure ID that is
used to identify the DS5100 and DS5300 storage expansion enclosure on a fibre
channel loop. The enclosure ID is located on the back of the unit. The enclosure ID
is set by the software. For details on enclosure ID settings, refer to the Installation,
User's and Maintenance Guide for the particular storage expansion enclosure.
Note: If the enclosure ID has not been automatically set, you have to set it
Each storage expansion enclosure in a DS5100 and DS5300 drive loop must have
a unique enclosure ID. DS5100 and DS5300 controllers use a combination of the
enclosure ID and the number of the physical slots that a hard drive occupies to
create a unique fibre channel loop address, or arbitrated loop physical address
(AL_PA), for each drive in a fibre channel drive loop. The enclosure ID consists of
two digits, a tens digit (x10) and a ones digit (x1). The enclosure IDs of EXP5000s
are automatically adjusted to be unique values by the EXP5000 ESM and the
controller firmware.
Attention:
(x10) enclosure ID setting to distinguish different redundant loops and use the ones
digit (x1) enclosure ID setting to distinguish storage expansion enclosures IDs
within a redundant loop. If you do not set the single digit value of the enclosure IDs
to be unique among storage expansion enclosures (including the DS5100 and
DS5300 with drives installed) in a redundant drive channel/loop pair, then drive loop
errors might be randomly posted in the DS5100 and DS5300 subsystem Major
Event Log (MEL) when you intermix different types of storage expansion enclosures
in a redundant drive loop pair. For example, in a DS5100 and DS5300 configuration
with 16 storage expansion enclosures distributed equally behind the four controller
drive ports, Table 43 shows the best practice enclosure ID settings for the
enclosures connected to the first four drive ports.
Table 43. Best practice enclosure ID settings scheme
Enclosure 1
Enclosure 2
Enclosure 3
Enclosure 4
The DS5100 and DS5300 normally ships with an enclosure ID outside the range of
00–77. However, if your DS5100 and DS5300 enclosure ID was set to a value
within the range of 00–77, it may be in conflict with the enclosure ID of one of the
storage expansion enclosures that you are trying to attach to the DS5100 and
DS5300. If this is the case, the amber ID Conflict LED on the storage expansion
enclosure will light up after you power on the storage subsystem.
Give each storage expansion enclosure in a redundant drive channel pair a unique
ones digit (x1) ID. This setting will enforce hard AL_PAs (unchangeable between
fibre channel Loop Initializations [LIPs]) for the drives and facilitate drive channel
manually through the software. To set the enclosure ID, see the Storage
Manager Online Help.
When connecting storage expansion enclosures, use the tens digit
Enclosure ID
behind the first
controller drive
port
01
02
03
04
Enclosure ID
behind the Enclosure ID
second behind the third
controller drive controller drive
port port
05 11
06 12
07 13
14
Chapter 3. Cabling the storage subsystem
Enclosure ID
behind the
fourth controller
drive port
15
16
17
107