HP 6400/8400 HP StorageWorks Enterprise Virtual Array Updating Product Softwar - Page 36

Managing application I/O timeouts for an online upgrade, Managing external devices

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Managing application I/O timeouts for an online upgrade Applications are typically insulated from the online controller firmware upgrade by the operating system and HBA driver software. Consequently, if the application is running on a properly configured operating system, the online controller upgrades will be performed successfully. It may be necessary to determine if any applications have timeout requirements that are more stringent than those of the operating system. Any applications with more stringent timeouts should be evaluated to determine if the application timeouts will be exceeded by the resynchronization interval that occurs during the online upgrade. IMPORTANT: It is crucial that you check application timeouts to verify that they are equal to or longer than the timeout thresholds for the upgrade. Although an application may survive the online controller software upgrade successfully, there may be an impact on performance. To minimize the performance impact on users, the online upgrade should be performed during a period of low user activity. Managing external devices If the EVA is being used as external storage (virtualized behind an HP StorageWorks XP array), perform the following resets before doing the upgrade (you will reset them after the upgrade is complete): IMPORTANT: Vraid0 LUNs on the EVA are not supported during an upgrade. • Enable System Option Mode 725 on the XP • Set the I/O Timeout to 240 seconds on all applicable external paths • Set the Path Blockade Watch Timer to 180 seconds on all applicable external paths Once the upgrade is complete, reset these parameters to their original values. Managing an SVSP configuration for an online upgrade If the EVA is in an SVSP configuration with SVSP synchronous mirrors, see the HP StorageWorks SAN Virtualization Services Platform Best Practices Guide for more information before upgrading. This document is available at http://www.hp.com/support/manuals. Select Storage Software under storage and then select HP StorageWorks SAN Virtualization Services Platform under Storage Virtualization Software. Back up all storage system data Estimated time to complete: Varies When to perform: As close as possible to the upgrade 36 Preparing for the upgrade

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Managing application I/O timeouts for an online upgrade
Applications are typically insulated from the online controller firmware upgrade by the operating
system and HBA driver software. Consequently, if the application is running on a properly configured
operating system, the online controller upgrades will be performed successfully.
It may be necessary to determine if any applications have timeout requirements that are more stringent
than those of the operating system. Any applications with more stringent timeouts should be evaluated
to determine if the application timeouts will be exceeded by the resynchronization interval that occurs
during the online upgrade.
IMPORTANT:
It is crucial that you check application timeouts to verify that they are equal to or longer than the
timeout thresholds for the upgrade.
Although an application may survive the online controller software upgrade successfully, there may
be an impact on performance. To minimize the performance impact on users, the online upgrade
should be performed during a period of low user activity.
Managing external devices
If the EVA is being used as external storage (virtualized behind an HP StorageWorks XP array),
perform the following resets before doing the upgrade (you will reset them after the upgrade is
complete):
IMPORTANT:
Vraid0 LUNs on the EVA are not supported during an upgrade.
•
Enable System Option Mode 725 on the XP
•
Set the I/O Timeout to 240 seconds on all applicable external paths
•
Set the Path Blockade Watch Timer to 180 seconds on all applicable external paths
Once the upgrade is complete, reset these parameters to their original values.
Managing an SVSP configuration for an online upgrade
If the EVA is in an SVSP configuration with SVSP synchronous mirrors, see the
HP StorageWorks SAN
Virtualization Services Platform Best Practices Guide
for more information before upgrading. This
document is available at
h
t
tp://w
w
w
.hp
.co
m/su
ppo
r
t/man
uals
. Select
Storage Software
under
storage and then select
HP StorageWorks SAN Virtualization Services Platform
under Storage
Virtualization Software.
Back up all storage system data
Estimated time to complete:
Varies
When to perform:
As close as possible to the upgrade
Preparing for the upgrade
36