HP XP P9000 Provisioning for Mainframe Systems User Guide

Storage system operation when LDEVs are formatted
The storage system acts in one of two ways immediately after an LDEV is added, depending on
the default settings in the storage system.
• The storage system automatically formats the added LDEV. This is the default action.
• The storage system blocks the LDEV instead of automatically formatting it.
To confirm or change the default formatting settings on the storage system, contact the administrator.
Users who have the Storage Administrator (Provisioning) role can change these default formatting
settings using Remote Web Console.
Quick Format function
The Quick Format function formats internal volumes in the background. While Quick Format is
running in the background, you can configure your system before the formatting is completed.
Before using Quick Format to format internal volumes, ensure that the internal volumes are in
blocked status.
I/O operation from a host during Quick Format are allowed. Formatting in the background might
affect performance.
Quick Format cannot be performed on the following volumes:
• Any volumes other than internal volumes
• Pool volumes
• Journal volumes
Quick Format specifications
DescriptionItem
The internal volume must be in blocked status.Preparation for executing the
Quick Format feature
Up to 36 parity groups can concurrently undergo Quick Format. There is no limit on
the number of volumes that can undergo Quick Format.
The number of parity groups
that can undergo Quick
Format
While one Quick Format operation is in progress, another Quick Format operation can
be performed. A maximum of 36 parity groups can concurrently undergo Quick Format.
Concurrent Quick Format
operations
At the beginning of the Quick Format operation, Remote Web Console performs
preliminary processing to generate management information. If a volume is undergoing
Preliminary processing
preliminary processing, the Remote Web Console main window shows the status of the
volume as Preparing Quick Format. While preliminary processing is in progress, hosts
cannot perform I/O access to the volume.
If a volume undergoing Quick Format is blocked, the storage system recognizes that
the volume is undergoing Quick Format. After the volume is restored, the status of the
volume changes to Normal (Quick Format).
Blocking and restoring of
volumes
If all volumes in one or more parity groups undergoing Quick Format are blocked, the
displayed number of parity groups undergoing Quick Format decreases by the number
of blocked parity groups. However, the number of parity groups that have not undergone
and can undergo Quick Format does not increase. To calculate the number of parity
groups that have not undergone but can undergo Quick Format, use the following
formula:
36 - X - Y
Where:
X indicates the number of parity groups on which Quick Format is being performed.
Y indicates the number of parity groups where all volumes are blocked during the Quick
Format.
48 Configuring custom-sized provisioning