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Re: Openldap 2.3.11 cannot autorecover from abnormal shutdown.
Thanks for your explaining.
We are a software vendor providing web-mail system solution and
OpenLDAP is a part of the solution. We must be sure that customer's
machine could successful startup(incluing openldap) after a power
failure. Because the OpenLDAP 2.0.27 with back-gdbm have no problem
under this environment, we must keep the newer version's stability.
I just want to decide add a 'db_recover' in the init script. Now I
have another question: when will slapd write the environment headers?
Farther, can you sure slapd should autorecover correctly after writing
environment?
2005/12/20, Howard Chu <hyc@symas.com>:
> Sounds like you lost power before the disk drive actually wrote the
> environment pages to disk.
> Again, read the BerkeleyDB documentation.
> http://www.sleepycat.com/docs/ref/program/cache.html
>
> There's no magic - if your system loses power before the disks finish
> writing the data, the data is lost. If the power fails before the
> environment headers are written, then the environment is useless, and
> there is nothing to recover.
>
> I believe this email thread has gone as far as it can. Don't be stupid:
> no amount of software can correct for catastrophic hardware failures -
> invest in an uninterruptible power supply.
>
> Yingbo Qiu wrote:
> >> Read the BerkeleyDB documentation. "db_stat -e" will print the
> >> environment version along with other information.
> >>
> >
> > But It just print
> > '''
> > db_stat: Program version 4.3 doesn't match environment version
> > db_stat: DB_ENV->open: DB_VERSION_MISMATCH: Database environment
> > version mismatch
> > '''
> >
> > I have to modify the env/env_region.c, and get next output:
> > '''
> > db_stat: Program version 4.3 doesn't match environment version
> > db_stat: Environment version 0.0 doesn't match program version
> > db_stat: DB_ENV->open: DB_VERSION_MISMATCH: Database environment
> > version mismatch
> > '''
> >
> > refer:
> > /* Make sure the region matches our build. */
> > if (renv->majver != DB_VERSION_MAJOR ||
> > renv->minver != DB_VERSION_MINOR) {
> > __db_err(dbenv,
> > "Program version %d.%d doesn't match environment version",
> > DB_VERSION_MAJOR, DB_VERSION_MINOR);
> > + __db_err(dbenv,
> > + "Environment version %d.%d doesn't match program version",
> > + renv->majver, renv->minver);
> > ret = DB_VERSION_MISMATCH;
> > goto err;
> > }
> >
> >
> >
>
>
> --
> -- Howard Chu
> Chief Architect, Symas Corp. http://www.symas.com
> Director, Highland Sun http://highlandsun.com/hyc
> OpenLDAP Core Team http://www.openldap.org/project/
>
>