HP 6400/8400 HP StorageWorks Enterprise Virtual Array Updating Product Softwar - Page 9

Getting started, Upgrade overview, Upgrade paths

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1 Getting started This chapter provides information about required kits and reference documentation. Before you perform the upgrade procedures, ensure that your system meets the requirements. Upgrade overview Depending on the upgrade path for your configuration, you can perform an upgrade either online or offline. Online upgrade EVA controller software is upgraded while the controllers are processing I/O. The controllers resynchronize simultaneously while hosts and applications continue to run. Resynchronization during an online upgrade represents a single disruption of I/O, not the multiple disruptions seen with some upgrade types. However, you must consider host and application timeouts when performing an online upgrade. Offline upgrade (shutdown upgrade) All host I/O to the storage system must be stopped. All applications and hosts are shut down before you begin the controller upgrade and restarted when the upgrade is complete. An offline upgrade requires scheduling time with application managers and having staff available to shut down and restart applications and hosts. While actual upgrade time may be short, offline upgrades can require several hours to complete, from the time the first application shuts down until all hosts and applications have returned to service. Upgrade paths For details about supported upgrade and downgrade paths, see Table 3.1, Upgrade support for controller software versions, and Table 3.2, Downgrade support for controller software versions, respectively, in the HP StorageWorks Enterprise Virtual Array Compatibility Reference. See Table 1 on page 10 for the link to this document. HP StorageWorks Enterprise Virtual Array Updating Product Software Guide (XCS 09534000) 9

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1 Getting started
This chapter provides information about required kits and reference documentation. Before you perform
the upgrade procedures, ensure that your system meets the requirements.
Upgrade overview
Depending on the upgrade path for your configuration, you can perform an upgrade either online
or offline.
Online upgrade
EVA controller software is upgraded while the controllers are processing I/O. The controllers
resynchronize simultaneously while hosts and applications continue to run. Resynchronization during
an online upgrade represents a single disruption of I/O, not the multiple disruptions seen with some
upgrade types. However, you must consider host and application timeouts when performing an online
upgrade.
Offline upgrade (shutdown upgrade)
All host I/O to the storage system must be stopped. All applications and hosts are shut down before
you begin the controller upgrade and restarted when the upgrade is complete.
An offline upgrade requires scheduling time with application managers and having staff available to
shut down and restart applications and hosts. While actual upgrade time may be short, offline upgrades
can require several hours to complete, from the time the first application shuts down until all hosts
and applications have returned to service.
Upgrade paths
For details about supported upgrade and downgrade paths, see Table 3.1, Upgrade support for
controller software versions, and Table 3.2, Downgrade support for controller software versions,
respectively, in the
HP StorageWorks Enterprise Virtual Array Compatibility Reference
. See
Table
1
on page 10 for the link to this document.
HP StorageWorks Enterprise Virtual Array Updating Product Software Guide (XCS 09534000)
9