[CentOS] Very slow disk performance on CentOS 4.5 [solved]
Alfred von Campe
alfred at von-campe.com
Fri Aug 31 19:52:19 UTC 2007
> Well most desktop motherboards these days provide for 2 SATA devices
> and 2 emulated PATA devices. Though the emulated PATA devices will
> probably end up using PIO instead of DMA for transfers which is
> slow and processor intensive, so these are usually reserved for
> optical drives, which are slow.
Thanks, Ross, that certainly explains it. I wonder why the
motherboard isn't labeled more clearly that not all SATA connectors
are treated the same.
> I would still have the 2 optical drives hda/hdb set for DMA transfer
> too as watching DVDs will be choppy and burning CDs/DVDs may be
> fraught with failures.
I'll keep that in mind.
> Most cases this isn't needed, but if you want to view and access
> information on SATA/SAS/SCSI disks you can google for 'sdparm', but
> it isn't as user-friendly as hdparm and not all options are
> implemented for SATA drives as they support a limited SCSI command
> spec.
I'll check out sdparm.
Thanks again,
Alfred
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