Which SCHED_ for DB server

Norberto Meijome freebsd at meijome.net
Thu Sep 1 08:17:21 GMT 2005

Holger Kipp wrote:
> Hello,

>>4 x SATA 150 drives, 90% of it RAID5 with gvinum.
> I do not know your applications, but if writing to disk is an issue:
> - WAL-files should be written to physically separated disks.
sorry, what do you mean by WAL-files

> - Write performance to RAID5 is not very good (tm).
>   This is both with softraid and with hardware raid, although
>   those raid controllers with 64MB or higher (+batterybackup)
>   might increase the visible performance if only a few processes
>   generate disk-i/o-load.
> - ATA is not good for production - better use SCSI.

I hear you... Budget reasons forced me to use this. I could go RAID10, 
but I'd lose about 200 GB which I probably will need.


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