User's Manual

172 Connectors
Channel Redundancy on PERC 4/DC, 4e/DC, 4/Di,
and 4e/Di Controllers
The following considerations apply when creating a channel-redundant
virtual disk on these controllers:
• It is recommended that you use a RAID 10 or RAID 50 when
implementing channel redundancy on the PERC 4/DC, 4e/DC, 4/Di, and
4e/Di controllers.
• If one of the channels (or enclosure) fails, you can no longer maintain I/O
operations on any of the channels included in the channel redundant
configuration even though data has not been lost. To restore I/O, do one of
the following:
– Fix the failed channel and reboot the system.
– Reboot the system. This restores I/O on the channels that have not
encountered a failure. The virtual disks on these channels are in a
degraded state.
Creating a Channel-redundant Virtual Disk
The following instructions describe creating a virtual disk that uses channel
redundancy.
NOTE: Channel redundancy only applies to controllers that have more than one
channel and that attach to an external disk enclosure.
1 Launch the Create Virtual Disk Advanced Wizard by doing the
following:
a Locate the controller on which you are creating a channel-redundant
virtual disk Expand the controller object until the
Virtual Disks
object is displayed.
b Select the Virtual Disks object and click Go To Create Virtual Disk
Wizard
.
c Click Virtual Disk Advanced Wizard .
2 Complete Create Virtual Disk Advanced Wizard (Step 1 of 4). This
portion of the
Create Virtual Disk Advanced Wizard asks you to select a
RAID level. When creating a channel-redundant virtual disk, it is
recommended that you select the following RAID levels.