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6.5.5 Hot-swappable boot disks
The I/O drawer provides up to 16 hot-swappable bays for internal disks,
organized in four cages, each one connected to a separate Ultra3 SCSI
controller.
Disk mirroring is strongly suggested for the operating system disks in order to
eliminate system outages because of operating system disk failures. If a mirrored
disk fails, AIX 5L automatically reroutes the I/O requests to the other disk, without
service interruption. You can replace the failed drive with the system online, and
mirror again, to restore disk redundancy. Mirroring rules are operating system
specific and therefore type and architecture of OS should be considered when
calculating the number of redundant disks.
6.5.6 Blind-swap, hot-plug PCI adapters
All PCI-X slots are PCI 2.2-compliant and are hot-plug enabled, which allows
most PCI adapters to be removed, added, or replaced without powering down the
system. This function enhances system availability and serviceability.
IBM introduced blind-swap mechanism to provide concurrent adding or removal
of PCI adapters when the system is running.
Figure 6-5 shows a basic drawing of the blind-swap hot-plug cassette.
Figure 6-5 blind-swap hot-plug cassette
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