HP 6100 HP 4x00/6x00/8x00 Enterprise Virtual Array Updating Product Software G - Page 23

XCS 6.240 upgrade considerations, Selecting an appropriate time to perform an online upgrade, - test page

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critical applications or operations is minimized during the upgrade, select a time when a host I/O disruption would minimize the impact to the business operations. • Communicating with HP Command View EVA-The first steps of the upgrade have a lower priority than host I/O. The upgrade can extend beyond the timeout values expected by HP Command View EVA, which may cause loss of management connectivity to the EVA. A HP Command View EVA discover operation may be required to re-establish communication with the EVA. XCS 6.240 upgrade considerations Before upgrading to XCS 6.240, consider the following: • When performing an online upgrade, to ensure a resynchronization time of less than 60 seconds, the total allocated capacity should be 10 TB or less and the configuration cannot contain DR groups. Upgrades in HP Continuous Access EVA configurations should be performed offline. Allocated capacity is the total of all virtual disks, snapshots, snapclones, mirrorclones and containers. NOTE: This is not a regression of support. It is a formal statement of limitations that have been in effect for previous releases. • Check the disk group alarm occupancy setting before upgrading. See the HP Enterprise Virtual Array best practices configuration white paper for guidelines on how to configure this setting based on your capacity. Locate the white paper for your array model at: http://h18006.www1.hp.com/storage/arraywhitepapers.html • HP test results show that upgrading the controller software online on an EVA containing Vraid0 LUNs can marginally increase the possibility of Vraid0 LUN data unavailability during the upgrade. To reduce this increased risk, either halt all host I/O to Vraid0 LUNs or migrate the LUNs to another Vraid level before the upgrade. • Stop all storage modification jobs (such as creation, deletion, presentation) 30 minutes before beginning the controller software upgrade. Selecting an appropriate time to perform an online upgrade To ensure the success of an online upgrade, selecting the appropriate time is essential. The two factors that most affect this selection are: • Criticality of business applications-Ensure that you do not select a time when critical business applications could be affected. • I/O load-Selecting a period of low I/O activity helps to ensure that the upgrade completes as quickly as possible, and avoids disruptions to host and applications due to timeouts. While there are advantages to performing an online upgrade, there are circumstances when it is not advisable. Therefore, give careful consideration to the circumstances of your configuration and application deployment before making an attempt to do an online upgrade. NOTE: When determining an appropriate time to do an online upgrade, ensure that no configuration-related replication tasks (creating or deleting DR groups, snapshots, snapclones, mirrorclones or presenting to hosts) are being performed. Analyzing storage system I/O using HP Command View EVAPerf The HP Command View EVAPerf tool included with HP Command View EVA can be used to gather and analyze statistics on storage system utilization. This section provides recommendations on using HP Command View EVAPerf to gather statistics to help identify periods of low storage system activity. XCS 6.240 upgrade considerations 23

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critical applications or operations is minimized during the upgrade, select a time when a host
I/O disruption would minimize the impact to the business operations.
•
Communicating with HP Command View EVA—The first steps of the upgrade have a lower
priority than host I/O. The upgrade can extend beyond the timeout values expected by HP
Command View EVA, which may cause loss of management connectivity to the EVA. A HP
Command View EVA discover operation may be required to re-establish communication with
the EVA.
XCS 6.240 upgrade considerations
Before upgrading to XCS 6.240, consider the following:
•
When performing an online upgrade, to ensure a resynchronization time of less than 60
seconds, the total allocated capacity should be 10 TB or less and the configuration cannot
contain DR groups. Upgrades in HP Continuous Access EVA configurations should be performed
offline. Allocated capacity is the total of all virtual disks, snapshots, snapclones, mirrorclones
and containers.
NOTE:
This is not a regression of support. It is a formal statement of limitations that have
been in effect for previous releases.
•
Check the disk group alarm occupancy setting before upgrading. See the HP Enterprise Virtual
Array best practices configuration white paper for guidelines on how to configure this setting
based on your capacity. Locate the white paper for your array model at:
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8
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.hp
.co
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•
HP test results show that upgrading the controller software online on an EVA containing Vraid0
LUNs can marginally increase the possibility of Vraid0 LUN data unavailability during the
upgrade. To reduce this increased risk, either halt all host I/O to Vraid0 LUNs or migrate the
LUNs to another Vraid level before the upgrade.
•
Stop all storage modification jobs (such as creation, deletion, presentation) 30 minutes before
beginning the controller software upgrade.
Selecting an appropriate time to perform an online upgrade
To ensure the success of an online upgrade, selecting the appropriate time is essential. The two
factors that most affect this selection are:
•
Criticality of business applications—Ensure that you do not select a time when critical business
applications could be affected.
•
I/O load—Selecting a period of low I/O activity helps to ensure that the upgrade completes
as quickly as possible, and avoids disruptions to host and applications due to timeouts.
While there are advantages to performing an online upgrade, there are circumstances when it is
not advisable. Therefore, give careful consideration to the circumstances of your configuration and
application deployment before making an attempt to do an online upgrade.
NOTE:
When determining an appropriate time to do an online upgrade, ensure that no
configuration-related replication tasks (creating or deleting DR groups, snapshots, snapclones,
mirrorclones or presenting to hosts) are being performed.
Analyzing storage system I/O using HP Command View EVAPerf
The HP Command View EVAPerf tool included with HP Command View EVA can be used to gather
and analyze statistics on storage system utilization. This section provides recommendations on
using HP Command View EVAPerf to gather statistics to help identify periods of low storage system
activity.
XCS 6.240 upgrade considerations
23