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Enclosure Interleaving Disk Configuration
5/21/04
Enclosure Interleaving Disk Configuration
Until recently, you could order only one disk configuration for an HP NonStop S-series system. This configuration had
mirrored pairs adjacent with the primary in an odd slot and the mirror in the next higher number (even) slot in the same
enclosure.
The HP NonStop Enterprise Division (NED) now provides a new, orderable, disk configuration with improved availability
characteristics. Based on a feature called Enclosure Interleaving, this disk configuration provides disk mirroring across
enclosures and is recommended to NED customers for its availability enhancements.
Notes:
• The new configurations do not apply to external disks.
• Both the primary and mirror for $SYSTEM must reside in Group 1, which causes restrictions on possible
configurations. These restrictions are accounted for in the configurations shown in this document.
• The new configurations include a new nonadjacent disk distribution for enclosures that cannot be mirrored.
Enclosure Interleaving Rules:
1. A topology branch consists of a processor enclosure and its associated I/O enclosures (for example, disk Groups 2
and 21-25). When there is only one enclosure on a topology branch, disks are distributed as shown under “Enclosure
Interleaving with Group 2, no Groups 21-25” (or, for Group 1 only, “Enclosure Interleaving with Group 1, no Groups
11-15”).
2. Whenever there is more than one enclosure on a topology branch, the primaries are always in odd slots, and mirrors
are always in even slots, specifically the next higher slot. For example, the mirror for the disk in slot 5 is always in
slot 6 in a different enclosure.
3. The mirror for a disk is in the next higher enclosure on the same topology branch. For example, mirrors for the odd
slots of disk group 2 are in 21, and mirrors for the odd slots of disk group 21 are in 22. Mirrors for the primaries in the
highest numbered enclosure on a topology branch are in the lowest numbered enclosure on a topology branch. For
example, if topology branch 2 contains enclosures 2 and 21-23, the mirrors for enclosure 23 are in enclosure 2. This
type of mirroring can be thought of as round-robin mirroring.
4. Group 1 and, therefore, topology branch 1, are different from other topology branches because of the restriction on
$SYSTEM, which is always in slots 11 and 12 of Group 1. The disks in slots 11 and 12 of the other enclosures on
topology branch 1 (Groups 11-15) follow these Enclosure Interleaving rules with Group 1 excluded.
5. The specifically named disks ($SYSTEM, $DSM, $AUDIT, and $OSS) all have primaries in disk Group1 and mirrors
in disk group 11 if possible. If a system does not have $OSS, it becomes another arbitrary volume
(for example, $D).
Hewlett-Packard Development Company L.P.
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