[PERFORM] Disk writes

2006-07-27 Thread carlosreimer
Hi,   We've a fedora core 3 box with PostgreSQL 8.0.   There is some performance problems with the server and I discovered with vmstat tool that there is some process writing a lot of information in the disk subsystem.   I stopped the database and even so vmstat showed the same rates of disk write

RES: RES: RES: [PERFORM] Initial database loading and IDE x SCSI

2006-06-02 Thread carlosreimer
> > Many thanks Mark, > > > > I will consider fsync=off only to do an initial load, not for a > database normal operation. > > > > This approach works well. You just need to remember to shut down the > database and start it back up again with fsync enabled for it to be safe > after the initial

RES: RES: [PERFORM] Initial database loading and IDE x SCSI

2006-06-02 Thread carlosreimer
Many thanks Mark, I will consider fsync=off only to do an initial load, not for a database normal operation. I was just thinking about this hipotetical scenario: a) a restore database operation b) fsync off c) write-back on (IDE) As I could understand, in this sceneraio, it´s normal the IDE dr

RES: [PERFORM] Initial database loading and IDE x SCSI

2006-06-02 Thread carlosreimer
> <[EMAIL PROTECTED]> writes: > > I would like to know if my supposition is right. > > > Considering an environment with only one hard disk attached to > a server, an > > initial loading of the database probably is much faster using an IDE/ATA > > interface with write-back on than using an SCSI int

[PERFORM] Initial database loading and IDE x SCSI

2006-06-02 Thread carlosreimer
Hi, I would like to know if my supposition is right. Considering an environment with only one hard disk attached to a server, an initial loading of the database probably is much faster using an IDE/ATA interface with write-back on than using an SCSI interface. That´s because of the SCSI command i