9.4 upgrade SHMVIRTSIZE problem

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Andrew - 29 Mar 2005 23:39 GMT

Upgrade from 9.21 to 9.40
Windows NT Advanced server SP3
4 Gig ram

Had had SHMVIRTSIZE set to 655360

Did the upgrade and Informix failed on setting up the Shared memory.
Worked OK if it was reduced - to 327680, and stepped up OK to 557056, but
after that it just falls over when you try to bring the bugger online.
Anyone got any ideas? Non Move to *ix realted, thanks. Just don't
understand how with nothing but the db version changed that suddenly starts
falling over.

Even just ideas about what to look at would be most welcome

ta
Andrew

Reply to this Message

Art S. Kagel - 30 Mar 2005 14:58 GMT

> Upgrade from 9.21 to 9.40
> Windows NT Advanced server SP3
[quoted text clipped - 8 lines]
> understand how with nothing but the db version changed that suddenly starts
> falling over.

It may be that the total of resident, virtual, and message segments exceeds
the OS max shared memory you can attach a process to. Why different than in
9.21? Because some other data structures in the RESIDENT segment may now be
larger than they were expanding that segment so that others need to be
smaller. Alternative to reducing SHMVIRTSIZE you may be able to reduce the
number of ipcshm connections in your NETTYPE parameters which will eliminate
some message (type M) shared memory and leave more room for virtual segments.

Art S. Kagel

> Even just ideas about what to look at would be most welcome
>
> ta
> Andrew

Reply to this Message