HP 6100 HP 4x00/6x00/8x00 Enterprise Virtual Array Updating Product Software G - Page 31

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

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NOTE: For Microsoft Windows guests, set the Windows SCSI timeout registry to 60 secs as follows: 1. In the Windows registry, find HKEY_LOCAL_MACHINE\System\CurrentControlSet\ Sevices\Disk\TimeOutValue 2. Set this value to 60 decimal (3Ch), 3. If the registry entry does not exist, you must create it. See your Windows documentation for instructions. The ESX layer (VMFS, the VMware filesystem) controls timeouts of VMFS I/O. These values may vary from ESX release to release. Xen Citrix For Xen Citrix, except for NFS SR timeouts, because Citrix XenServer 5.0 mounts using software with non-default timeout values, use the values as specified for Linux, "Linux" (page 28). To check or set Xen Citrix parameters, use the set_parm executable found in the /opt/hp/ directory. When executed, the options to change timeout values are displayed. NOTE: • The timeout values must be increased for Emulex single path (without multipath support) and QLogic single path being used in the environment. This is not only important for online upgrades but for general data integrity. • Online controller firmware upgrades are supported with Xen Citrix boot devices. 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 XP array), perform the following resets before doing the upgrade (you will reset them after the upgrade is complete): NOTE: Vraid0 LUNs on the EVA are not supported during the 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 application I/O timeouts for an online upgrade 31

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NOTE:
For Microsoft Windows guests, set the Windows SCSI timeout registry to 60 secs as
follows:
1.
In the Windows registry, find
HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Sevices\Disk\TimeOutValue
2.
Set this value to 60 decimal (3Ch),
3.
If the registry entry does not exist, you must create it. See your Windows documentation for
instructions.
The ESX layer (VMFS, the VMware filesystem) controls timeouts of VMFS I/O. These values may
vary from ESX release to release.
Xen Citrix
For Xen Citrix, except for NFS SR timeouts, because Citrix XenServer 5.0 mounts using software
with non-default timeout values, use the values as specified for Linux,
“Linux” (page 28)
.
To check or set Xen Citrix parameters, use the
set_parm
executable found in the
/opt/hp/
<driver-specific>
directory. When executed, the options to change timeout values are
displayed.
NOTE:
•
The timeout values must be increased for Emulex single path (without multipath support) and
QLogic single path being used in the environment. This is not only important for online upgrades
but for general data integrity.
•
Online controller firmware upgrades are supported with Xen Citrix boot devices.
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 XP array), perform the
following resets before doing the upgrade (you will reset them after the upgrade is complete):
NOTE:
Vraid0 LUNs on the EVA are not supported during the 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 application I/O timeouts for an online upgrade
31