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Requirements for Daisy-Chain
1
Daisy-Chained Disks Not
Recommended
Daisy-Chained Disks Recommended
FCSA for each Fibre Channel loop is
installed in a different IOAM module
for fault tolerance.
Two Fibre Channel disk modules
minimum, with four Fibre Channel
disk modules maximum per daisy
chain.
1 See “Fibre Channel Devices” (page 60).
This illustration shows an example of cable connections between the two FCSAs and four Fibre
Channel disk modules in a single daisy-chain configuration:
A second equivalent configuration, including an IOAM enclosure, two FCSAs, four Fibre Channel
disk modules with an ID expander, is required for fault-tolerant mirrored disk storage. Installing
each mirrored disk in the same corresponding FCDM and bay number as its primary disk in not
required, but it is recommend to simplify the physical management and identification of the
disks.
This table list the FCSA group-module-slot-port (GMSP) and disk group-module-shelf-bay
(GMSB) identification for the factory-default system disk locations in a daisy-chained
configuration:
Disk GMSB*FCSA GMSPDisk Volume Name
110.211.101110.2.1.1 and 110.3.1.1$SYSTEM
110.211.102110.2.1.1 and 110.3.1.1$DSMSCM
110.211.103110.2.1.1 and 110.3.1.1$AUDIT
68 System Configuration Guidelines