HP 3PAR InForm OS 3.1.1 CLI Administrator's Manual

Viewing the Event Log
• To view the events log, simply issue the showeventlog command.
The showeventlog display can be refined to include only events occurring before or after
a specified time, within a specified time period, and that match a specified pattern. For
complete information on the events log’s display options, see the HP 3PAR InForm OS Command
Line Interface Reference.
Stopped Logical Disks and Missing Physical Disks
If physical disks in the system are unavailable when the system is powered on, the physical disk
is in the Missing state. The system manager will not immediately start logical disks that have chunklets
on these missing disks. The result is some logical disks remain in the Stopped state. Use the showpd
and showld commands to display the state of physical and logical disks.
If the logical disk is data-complete, but a few of the physical disks are missing, the logical disks
will be automatically started after waiting five minutes. If more than four physical disks are missing,
the logical disks will not be started automatically. You can start a data-complete logical disk using
the InForm OS CLI startld command, and the system manager will begin reconstructing the
missing mirrored data. The system automatically relocates the chunklets from the missing physical
disks to free space or spare space.
For a complete list of options available for the showpd and showld commands, see the HP 3PAR
InForm OS Command Line Interface Reference and InForm OS CLI Help.
Preserved Data
When the system is holding data in cache but is not able to write that data to the destination disk
for any reason, it saves the data to the preserved data logical disk. This logical disk is automatically
created at the time that the storage system is installed and initially configured.
The data written to the preserved data logical disks is typically created due to a temporary loss of
availability of disks, a situation that usually corrects itself once the disks become available again.
When the destination logical disks become available again, the system automatically plays back
the preserved data by writing it from the preserved data LDs to the destination logical disks.
If you notice that the preserved data logical disk has data saved for a long time, use the showpd
command to see which physical disks are in an unavailable state. If any disks are in an unavailable
state, it is necessary to take corrective action in order to make those disks available again. If data
is persistently saved to the preserved data logical disk, contact your local service provider for
technical support and services.
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