Pillar Axiom: How to increase the LUN capacity

Asset ID:	1-71-1443468.1
Update Date:	2012-08-29
Keywords:

Solution Type Technical Instruction Sure

Solution 1443468.1 : Pillar Axiom: How to increase the LUN capacity

Applies to:

Pillar Axiom 600 Storage System - Version Not Applicable and later
Information in this document applies to any platform.
Customer wants to increase LUN size that they are already using.

Goal

This document gives general steps to increase LUN size on Axiom 600.

It is required to check OS limitations and procedures to resize LUN at OS level.

For example Windows has limitation for LUNs with MBR label over 2T. It is necessary to use GPT if the LUN size will be over 2T after resizing. Master boot record (MBR) disks use the standard BIOS partition table. GUID partition table (GPT) disks use unified extensible firmware interface (UEFI). One advantage of GPT disks is that you can have more than four partitions on each disk. GPT is also required for disks larger than 2 terabytes. But this conversion will destroy current data on disk. You need to take backup and restore after increasing the LUN size.

Fix

You can do LUN re-size on Axiom without outage.
You can modify LUN details online except re-homing the LUN.

Modify a LUN
You may need to modify the current Quality of Service (QoS) attributes for a LUN, such as increase the capacity or allocate space for Clone LUNs. You can also modify the mapping of a LUN as well as change the Slammer and control unit (CU) to which the LUN is assigned.

1- Click the Storage icon in the top context pane.
2- Click the LUNs link in the left navigation pane.
3- Select the LUN that you want to modify.
4- Choose Modify LUN from the Actions drop-down list.
5- Modify any of the tabbed LUN pages and click OK.

For parameter definitions, see the following:

SAN LUN size
Minimum: 1 to 2 GB. The exact value depends on these factors

● Brick type (Fibre Channel or SATA)
● RAID geometry (RAID 5 or Distributed RAID)
● Strip size (1 MB or normal)
Maximum: System capacity
Note: All capacity values must be in increments of 1 GB.

Here Operating limits for Pillar Axiom SAN systems:
SAN LUNs Maximum n = 4095 visible for each system
                                            256 visible for each host
                                            4095 visible for each SAN Slammer


SAN LUN size Minimum: 1 to 2 GB. The exact value depends on these factors
Brick type (Fibre Channel, SATA, or SSD)
RAID geometry (RAID 5 or Pooled RAID 10)
Strip size (1 MB or normal)
Maximum = system capacity
Maximum capacity is unlimited for a logical volume if the Thin Provisioning license is installed.

For more details please consult Axiom system documentation:
Release 4.5 http://docs.oracle.com/cd/E28234_01/index.htm
Release 5.2 http://docs.oracle.com/cd/E27438_01/index.htm
Release 5.3 http://docs.oracle.com/cd/E29307_01/index.htm

The documentation also exists on the pilot as well and is available via the GUI for download.

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