we have 1500 systems in the local network running with sep 12.1.1 now we have planed to upgrade to server with 12.1.2 please let me know how many system i can push the new sep 12.1.2 package at a time to upgrade.

You can use auto upgrade feature

https://www-secure.symantec.com/connect/articles/upgrade-clients-sep-121-auto-upgrade-feature

How to upgrade Symantec Endpoint Protection clients using the Auto-Upgrade feature

do you want to use auto upgrafe or push method?

since  clients are in LAN. you can autoupgrade one group at a time or you can schedule the upgrade.

You can use auto-upgrade, client deployment wizard or a third party method such as sccm or even gpo

How many clients are in single group?

If all the clients are in local network then you can choose the autoupgrade feature one by one on all groups.

note that the load on SEPM should also be considered.

hi,

I want to to do the auto upgrade from the group it self how many systems can get upgrade at a time let me know the exact system count that i can upgrade at once.

Hi,

Check pete comments on this thread

https://www-secure.symantec.com/connect/forums/sep-11061-install-package-upgrade-question

Upgrade Schedule lets you control the time of the client computer upgrade.

- From, To:

• Specifies a range of time over which to install packages. If the From and To times match, the upgrades start immediately.

- Distribute upgrades over:

• Specifies the number of days or hours over which the packages can be distributed.
• The following formula calculates time:

• • (Package Size\Server Transfer Rate) * Number of Computers

    as

    MB / MB per second * Num = seconds

dear Raju please understand my question in the same group at a time how many system i can upgrade i want it in exact count 

we dont have any third party patch server to upgrade

the link provides the information of version 11.x which is outdated.

Link is old but calculation formula are same for sep 11.x and sep 12.x

Do you need more help here? if not please update the thread.