Configuring Internal Disk Drives - NEC Express5800 320La System Configuration Manual

Configuring Internal Disk Drives

The hard disk drive storage bays can house up to six hard disk drives, which
when mirrored results into three logical drives. The physical disk drive slots are
numbered 1 to 6 (left to right), but the SCSI ID is numbered 0, 1, 2, 0, 1, 2.
When mirrored into two pair of three logical disk drives, the first mirrored pair
consists of hard disks 1 and 4 (SCSI ID 0), the other two disk mirrored pairs are
hard disks 2 and 5 (SCSI ID 1) and hard disks 3 and 6 (SCSI ID 2). A duplex
access channel is implemented by giving each group of drives separate channels
from two PCI modules. Physical access channels for internal SCSI disks are set
in dual configuration as shown in the below table. Dual channel access to all
drives is available from either PCI module. Refer to the table below. The server
also provides a single channel for general SCSI disks.
The table below shows the correlation between the SCSI disk slot numbers and
device names. Use the device names to access the internal SCSI disks and
perform operations.
IMPORTANT:
"RESYNCING" or "RECOVERY" state. While the disks are in this state, do not
remove them, turn off the power, or restart the system. Wait until RESYNCING"
or "RECOVERY" has completed. (You can confirm the current RAID status by
executing ftdiskadm.) If you should accidentally reboot your system during the
"RESYNCING" or "RECOVERY" state, the data on your disks has not been
corrupted. After reboot, the "RESYNCING" of your disks restarts from the
beginning. Your server is not in a fault tolerant state until "RESYNCING" has
completed.
2-8 Configuring Linux
Channels for SCSI Disks
PCI1 – Channel1 – SCSI Slot 1, 2, 3
PCI1 – Channel2 – SCSI Slot 4, 5, 6
PCI2 – Channel1 – SCSI Slot 4, 5, 6
PCI2 – Channel2 – SCSI Slot 1, 2, 3
Slot number Device name
1 sda
2 scb
3 sdc
4 sdd
5 sde
6 sdf
When a disk is added or RAID is rebuilt, each disk enters the