SCF Reference Manual for the Storage Subsystem (G06.28+, H06.05+, J06.03+)

Considerations for DELETE PROFILE
• You cannot delete the standard profile $ZZSTO.#INTERNAL-DISK.
• After you delete a custom profile, autoconfiguration uses the default profile.
Examples
To delete the custom profile for all disks inserted into group 01:
-> DELETE PROFILE $ZZSTO.#INTERNAL-DISK-1
Mirrored Disk Placement
Mirroring Without NonStop S-Series Enclosure Interleaving
For proper fault tolerance, always install the two disks of a mirrored volume on different SCSI
buses:
• For internal disks in a NonStop S-series system enclosure, if you install the primary disk in an
odd-numbered slot, install the mirror disk in an even-numbered slot.
• For model 45xx disks, configure the primary disk and mirror disk of a mirrored volume in
different disk modules.
• Mirroring With NonStop S-Series Enclosure Interleaving
NOTE: Enclosure interleaving does not apply to Integrity NonStop NS-series systems.
Enclosure interleaving improves the fault tolerance of your NonStop S-series system by allowing
you to install the disks of a mirrored volume (or configure the adapters for the two disks of a
mirrored volume) in separate enclosures within the same topology branch. Configuring paths across
multiple enclosures increases availability, because no enclosure is a single point of failure preventing
access to the storage device.
For internal disks, install the halves of a mirrored volume in separate enclosures. The disks that
make up a mirrored volume need not be in an even-numbered and odd-numbered slot. The -P and
-B paths must be in one enclosure. The -M and -MB paths are in another enclosure in the same
topology branch.
For model 45xx disks, install their adapters in separate enclosures.
For more information about enclosure interleaving, see the NonStop S-Series Planning and
Configuration Guide.
Mirroring With M8xxx Fibre Channel Disks
For model M8xxx disks, configure the primary disk and mirror disk of a mirrored volume in different
FCDMs, connected to a different pair of Fibre Channel loops.
If FCDMs are daisy-chained, the primary disk and mirror disk of a mirrored volume must be in
different sets of daisy-chained enclosures.
Mirroring With CLIM-Attached Disks
The ADD DISK, MIRRORCLIM attribute enables you to mirror a CLIM-attached disk, and the
MIRRORPARTITION attribute enables you to mirror the partition of a SAS HDD or SSD. Primary
and mirror disks cannot both be on the same disk enclosure.
You can configure the DP2 processes in any available NonStop CPU pairs. A single disk can have
the DP2 processes (disk LDEVs) associated with its individual partitions configured in different
NonStop CPU pairs.
For data migration purposes only, you can mirror a SAS SSD with a different type of disk.
Mirrored Disk Placement 77