3PAR InForm® OS 2.3.1 CLI Administrator's Manual (320-200180 Rev B, February 2010)

11.5
Stopped Logical Disks and Missing Physical Disks
InForm OS Version 2.3.1 3PAR InForm CLI Administrator’s Manual
11.6.1 Preserved Data
When the InServ storage 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.