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ipcshm and AIX

Posted in 2007

Topics: Backup & Restore, Connectivity: ESQL/C, 4GL & Embedded SQL, Networking & sqlhosts Configuration, Migration, Import/Export & Data Conversion, Platform-Specific Issues, Cloud, Docker & Containers

mweallans@panacea.co.uk — — source: Usenet: comp.databases.informix

We have always been informed by one of the UK Vars that we should configure ipcstr connections and not ipcshm when running on AIX. Does anybody have any idea why and what would be the ramifications of uisng ipcshm instead? I have a weird problem which has only surfaced since we did a massive migration of firmware, OS, IDS, and application software and during this change somebody changed which connection would be used to the server for 4GL programs running on the same system from onsoctcp to onipcshm. Everything is working OK apart from a very intermittent problem with onbar/ISM where devices become unmounted for no apparent reason. I don't see why this change would be related to the problem but as a wiser man than me once said "If you're looking for a needle in a haystack you can't help clutching at straws" regards Malcolm

↪ replying to mweallans@panacea.co.uk
Claus Samuelsen — — source: Usenet: comp.databases.informix

mweallans@panacea.co.uk wrote: > We have always been informed by one of the UK Vars that we should > configure ipcstr connections and not ipcshm when running on AIX. Does > anybody have any idea why and what would be the ramifications of uisng > ipcshm instead? > > I have a weird problem which has only surfaced since we did a massive > migration of firmware, OS, IDS, and application software and during > this change somebody changed which connection would be used to the > server for 4GL programs running on the same system from onsoctcp to > onipcshm. > > Everything is working OK apart from a very intermittent problem with > onbar/ISM where devices become unmounted for no apparent reason. I > don't see why this change would be related to the problem but as a > wiser man than me once said > "If you're looking for a needle in a haystack you can't help clutching > at straws" > > regards > > Malcolm > If I remember correctly, when IBM released the powerPC version 4 CPU some changes were made to the semaphore handling. These changes made sometimes an ipcshm connection unexpectedly hang. A workaround to this problem was to change ipcshm to ipcstr. Still if I remember correctly, the problem was solved in IDS 7.31.UD2 I don't think there has been problems using ipcshm on AIX since then. Claus

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