05-15-2010
That depends on which method you employ to upgrade your server and what exactly you understand under "upgrade or migration".
If you mean a OS level upgrade: it can be done several ways. One way would be a "alt-disk-install", durich which the system will be available, save for a reboot.
If you mean hardware upgrade and/or DLPAR migration: yes, this is also possible while the system is under load. Hardware chamges itself can cause downtimes, depending on what you want to change and how much hardware you have: Memory and CPUs need a downtime of the machine, but with enough hardware resources you could live-migrate the LPARs to (an)other machine(s), do the upgrade and migrate them back.
All these methods depend on a certain infrastructure which you may or may not have available. So tell us, what you want to do, what you have and we give you a honest anwer instead of throwing around wild guesses.
bakunin
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relup(5) Files relup(5)
NAME
relup - Release upgrade file
DESCRIPTION
The release upgrade file describes how a release is upgraded in a running system.
This file is automatically generated by systools:make_relup/3,4 , using a release resource file ( .rel ), application resource files ( .app
) and application upgrade files ( .appup ) as input.
FILE SYNTAX
In a target system, the release upgrade file should be located in the OTP_ROOT/erts-EVsn/Vsn directory.
The relup file contains one single Erlang term, which defines the instructions used to upgrade the release. The file has the following syn-
tax:
{Vsn,
[{UpFromVsn, Descr, Instructions}, ...],
[{DownToVsn, Descr, Instructions}, ...]}.
* Vsn = string() is the current version of the release.
* UpFromVsn = string() is an earlier version of the release to upgrade from.
* Descr = term() is a user defined parameter passed from the systools:make_relup/3,4 function. It will be used in the return value of
release_handler:install_release/1,2 .
* Instructions is a list of low-level release upgrade instructions, see appup(5) .
It consists of the release upgrade instructions from the respective application upgrade files (high-level instructions are translated
to low-level instructions), in the same order as in the start script.
* DownToVsn = string() is an earlier version of the release to downgrade to.
When upgrading from UpFromVsn with release_handler:install_release/1,2 , there does not have to be an exact match of versions, but
UpFromVsn can be a sub-string of the current release version.
SEE ALSO
app(5), appup(5), rel(5), release_handler(3erl), systools(3erl)
Ericsson AB sasl 2.1.9.3 relup(5)