User manual

Fibre to SAS/SATA II RAID Subsystem
114
User Manual
Appendix 1 Volume Mapping in Dual Controller Mode
In dual controller mode, the RAID subsystem has 2 Controllers, which work in
Active/Standby-Standby/Active mode.
In Active/Standby-Standby/Active mode, Volume Sets assigned even-numbered
LUNs are active in Controller 1 and standby Controller 2, and Volume Sets assigned
odd-numbered LUNs are standby in Controller 1 and active in Controller 2.
NOTE: In Dual Controller mode, when using SATA disk drives (with
dongle boards) it is recommended to create only a single Volume
Set in a Raid Set (group of drives). For SAS disk drives, no
problem to create several Volume Sets per Raid Set.
NOTE: In Dual Controller mode, if Controller 1 fails, Controller 2 will take
over. The fail over mode is called “Round Robin with Subset”
(using MS Windows term).
IMPORTANT: MPIO must be configured on the host system(s), in
order for redundant LUNs (two paths via Controller 1 and 2) to
appear as single LUNs.