Technical data

Online Add and Replacement (OLAR) of PCI Cards
PCI Card Slot Latches and Doorbells
HP System Partitions Guide: Administration for nPartitions, rev 5.1 378
PCI Card Slot Latches and Doorbells
NOTE This section applies only to HP rp7410 and rp8400 servers.
This section introduces two features of HP rp7410 and rp8400 server I/O
chassis: PCI card slot latches and PCI card slot doorbell buttons.
PCI Card Slot Latches
Both HP rp7410 and rp8400 servers have slot latches for all PCI card
slots; each PCI card slot has its own latch.
Each PCI card slot latch can enable or disable power to its card slot and,
when closed, the latch can secure a PCI card in place. These slot latches
are accessible when you have removed the top cover from an HP rp7410
or rp8400 server chassis.
Card slot latches are used both for offline PCI card procedures and for
online PCI card procedures.
When a PCI slot latch is open, the slot is powered off.
When a PCI slot latch is closed, the slot can have power enabled.
However, note that when a slot’s latch is closed the slot’s power can be
disabled as part of a PCI card OLAR procedure from SAM or Partition
Manager, or as a manual operation performed from the HP-UX
command-line or from a service processor (GSP or MP) command.
NOTE When HP-UX is running in the nPartition to which an I/O chassis
belongs, you should use SAM or Partition Manager procedures to
prepare a PCI card slot before opening or closing the slot’s latch.
Otherwise you may encounter unpredictable results.
Figure 8-1 on page 379 shows positions of PCI card slot latches. While an
HP rp8400 server is shown in Figure 8-1, HP rp7410 card slot latches are
available in the same location and operate identically.