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What is the best senario for upgrading SAP ECC6 EHP0 to EHP8 in replicated systems?

Jul 10, 2017 at 07:52 PM

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Former Member

Hi Guys

We are performing an Upgrade of SAP ERP 6.0 EHP 0 to EHP 8 based in AIX and Oracle 12c.

This is a productive database so its replicated to another server using Dataguard.

My main questions are:

-What is the best senario for this upgrade without or with minimum downtime?

-If i did the upgrade on DR server to be EHP 8 the changes in data that happened on the main server on EHP 0 will replicated to DR server correctly?

-Is the oracle dataguard tool can replicate two systems with different EHP version?

Regards

Karem

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2 Answers

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Former Member Jul 10, 2017 at 08:56 PM
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Hi Karem,

First EhP0 to EhP8 is a two step upgrade, you cannot upgrade it directly in one step.

Data guard can support such scenario Ex: If you upgrade your primary system then all changes will get replicated to secondary but still you need to perform few manual steps at application level (Like Kernel, Profile parameters etc.) BUT if you perform the upgrade by following this scenario, how can you manage your primary with archive logs ON during the upgrade ? It generates tons of archive logs which need to be shipped and applied on DR database. Other challenge is if you are following this scenario, how can you use your DR as fall back solution if your upgrade goes into trouble ? Versions of Oracle on primary and target (of EhP8) also plays a role here.

To avoid these issues, perform upgrade on Primary (Disconnect Data guard just before the downtime so that it can be used as fall back solution if your primary is not usable) and do a backup restore and Data guard enablement after the upgrade.

Regards,

Harish Karra

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Former Member

Dear Harish

Thank you for your fastest reply

I would like to know regarding to your suggestion senario if i make the upgrade on primary machine to EHP 8 and at the same time our business users is connected to DR machine on EHP0 (to avoid the down time due two steps of upgrade and to keep our business continuity) and the dataguard is off, after i success in the upgrade on primary can i sync the changes in data that happened due to the upgrade time on DR machine to primary to make our users connect again to primary(DR still on EhP0)?. After that i can upgrade the DR machine by any means.

Regards

Karem

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Former Member
Former Member

No.....if you open your database on secondary for transactional use, how can you sync it again from upgraded system ?

Your sequence would be - Upgrade your primary to EhP7 after disabling the data guard - Do a backup restore and enable data guard - Upgrade your primary to EhP8 - Do a backup restore and enable data guard

Perform DB upgrades in between if required (DB upgrade doesn't need backup restore as Data guard can take care of the upgrade activity on DR)

Regards,

Harish Karra

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Former Member
Former Member

Dear Harish,

1- why I can't upgrade to EHP8 directly in one step?is there a sap note or guide mentioned this restriction?

2- did you mean in last sequence all this steps our system will be in downtime?

3- how can i estimate the downtime duration?

Regards Karem

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Former Member
Former Member

Hi Karem,

1) Yes direct upgrade is possible on ERP 6.0 but there are other things you need to consider like system should be Unicode if you go with one step upgrade. For EhP8, Unicode version is mandatory.

Refer:

2171334 - EHP8 for SAP ERP 6.0 SP Stacks - Release & Information Note

why-ehp-8-is-different

2) Sorry, I didn't understand your query

3) It depends on lot of things...your trial runs can give you the estimate

Regards,

Harish Karra

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Former Member
Former Member

2- did you mean that during the upgrade for primary and DR our systems will be in downtime and our users cannot connect to any system, and there so no way to upgrade these two systems (main and DR) without downtime?

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Former Member
Former Member

Yes,

Upgrade is an uptime+downtime activity. Most of the activities are done during uptime in a shadow system and those will get replicated in original system during it's downtime.

Downtime is very minimum (again depends on system performance and other factors) but downtime is mandatory.

Regards,

Harish Karra

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Reagan Benjamin
Jul 12, 2017 at 09:08 AM
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A direct update to EHP8 is possible if the conditions are met.

Download the SUM Central note and check the upgrade paths provided there.

2371752 - Central Note - Software Update Manager 1.0 SP20 [lmt_006]

As the source system is ERP 6.0 you need to check the note 2187353 for the minimum SP requirement.

2187353 - SP Equivalence for update/upgrade to SAP NW 7.5

First you need to make sure you have supported OS and DB for the EHP8 update. Check PAM. In previous releases of SUM there used to be an option to disable archiving at the database level which will switch the database into no-archive log mode. I am not sure about this in the newer versions of SUM but you need to make sure this is not enabled. As long as the archive logs are generated the standby database will get updated. All modifications is done at the database level so Oracle will replicate all the changes from the source to the target using the archive logs. You need to make sure there is sufficient space at the file-system at both sites. The EHP8 update should be done on the main instance. As the target system is based on EHP8, during the update the system will be modifying the profiles as there is no longer START profiles. So you need to make sure the DR site is updated with the new profiles, kernel and other things.

If there is enough resources at the OS level then increasing the number of processes for the uptime and downtime tasks can help. As a starting step download and read the upgrade guide.

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