The 3.13 IOCs are very old MV2300s with only 32MB RAM of which 28 are in use. The larger record size in 3.14+ is overloading them. There are plans to remove them in the SLS-2 upgrade in a few years, so nobody is interested to upgrade their hardware right now. But I would like to migrate as many other IOCs from 3.14 to 7 before the SLS-2 upgrade.
I was thinking of reverting those parts of your modifications that prevent the 3.13 IOCs from connecting. The commit message suggests that it was not your intention to remove support for 3.13 clients but for much older versions (3.12? 2.x?).
I consider doing that during the codeathon.
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https://bugs.launchpad.net/bugs/1971737
Title:
EPICS 3.13 clients cannot connect to EPICS 7 or 3.16
Status in EPICS Base:
New
Bug description:
Since commit 95fd255d "rsrv: ignore CA client version older than v4.4"
from Jul 30 2016, EPICS 3.13 clients cannot connect any more, even
though their CA version is V4.8.
The reason is that camessage drops the incoming CA_PROTO_SEARCH
messages because the 3.13 client has not yet sent a CA_PROTO_VERSION
message and thus the code reads client->minor_version_number as 0.
This is a huge hindrance for upgrading 3.14 IOCs to EPICS 7 when there
are still 3.13 IOC (which cannot be upgraded yet) in the network which
need to connect.
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- [Bug 1971737] [NEW] EPICS 3.13 clients cannot connect to EPICS 7 or 3.16 Dirk Zimoch via Core-talk
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