SCF Reference Manual for the Storage Subsystem (G06.24+, H06.03+)

Configuring Magnetic Disks
SCF Reference Manual for the Storage Subsystem—529937-007
6-3
Considerations for M8xxx Fibre Channel Disks
Considerations for M8xxx Fibre Channel Disks
•
In a disk-drive enclosure containing M8xxx disks, at least one disk must be added
for the enclosure to be recognized.
•
Before you add the first M8xxx disk in an enclosure to the storage subsystem, the
primary and backup paths must be physically connected.
•
Before you add a mirrored pair of M8xxx disks to the storage subsystem, both
paths to the primary disk and the mirror disk must be physically connected.
•
The primary disk and mirror disk of a mirrored pair of M8xxx disks must be in
different disk-drive enclosures, connected to a different pair of Fibre Channel
loops.
•
During normal operations, an M8xxx disk can only be mirrored with another M8xxx
disk. If you attempt to mirror an M8xxx disk with an internal disk or an ESS disk,
you trigger a migratory revive, causing the source drive to go hard down after the
revive is complete. For information about the migratory revive operation, see the
Modular I/O Installation Guide.
•
SCF requires that you specify a primary and a backup path when configuring an
M8xxx disk.
Table 6-1. Disk Path Attributes
Internal
SCSI
Disks
45xx Disks
(Modular Disk
Subsystem)
M8xxx
Fibre Channel
Disks
ESS Disks
(NonStop
S-series
servers)
ESS Disks
(NonStop
NS-series
servers)
LOCATION
Group 1-89 1-89 110-125 11-89 110-125
Module 1 1 2-3 (IOAM) 2-3 (IOAM) 2-3 (IOAM)
Slot 1-18 51-54 (SNDA) 1-5 (FCSA) 1-5 (FCSA) 1-5 (FCSA)
SAC 1-2 * 1-4 1-2 1-2 1-2
DEVICEID 0-9 * 0-7 Shelf 1-4
Bay 1-14
NA NA
PORTNAME NA NA NA 64-bit WWN 64-bit WWN
LUN NA NA NA 0-32767 0-32767
* For Internal SCSI disks, SAC and DEVICEID are not required. SCF derives these values from the slot.
LOCATION represents PRIMARYLOCATION, BACKUPLOCATION, MIRRORLOCATION, and
MBACKUPLOCATION.
SAC represents PRIMARYSAC, BACKUPSAC, MIRRORSAC, and MBACKUPSAC
DEVICEID represents PRIMARYDEVICEID, BACKUPDEVICEID, MIRRORDEVICEID, and
MBACKUPDEVICEID.
PORTNAME represents PRIMARYPORTNAME, BACKUPPORTNAME, MIRRORPORTNAME, and
MBACKUPPORTNAME.
LUN represents PRIMARYLUN and MIRRORLUN.