Re: db region files, txn logs, and db files should all exist in separate directories

[Quanah Gibson-Mount <quanah@stanford.edu>]

--On Monday, February 02, 2004 7:30 PM -0500 ashish@ratboy.net wrote:

> Currently there is no way to split off  the txn logs, db files,
> and db region files into three separate directories.
> This would help with performance (especially on the master
> server), as the three separate components could be placed
> on separate disks.
>
>
> db region files (__db.*) -> /var/ldap/openldap-bdb
> db files (*.bdb) -> /var/ldap/openldap-bdb/data
> txn logs (log.*) -> /var/ldap/openldap-bdb/transaction_log
>
> The only configuration option available right now is the bdb
> directory, and all the above mentioned files get created in that
> directory.
>
> If there exists some ways to fix this, I would appreciate it...
> If not, do I file this as an enhancement request in the openldap
> bug repository?

Actually,

You are incorrect, it is quite possible to do exactly what you have asked, 
and this is a BDB issue more than an OpenLDAP issue. ;)

You can place your log files into a separate directory using the

set_lg_dir /var/ldap/openldap-bdb/transaction_log

in DB_CONFIG

I forget how to separate out the __db.* bits from the *.bdb, but I recall 
it is quite doable (I did it once, didn't really help much).

Also, in the OpenLDAP 2.2 series, you can use a memory cache for the __db.* 
files, which appears to be quite efficient.


--Quanah

--
Quanah Gibson-Mount
Principal Software Developer
ITSS/TSS/Computing Systems
ITSS/TSS/Infrastructure Operations
Stanford University
GnuPG Public Key: http://www.stanford.edu/~quanah/pgp.html