[gentoo-user] Re: /dev/hdb performance really sucks ...

[James <wireless@tampabay.rr.com>]

Richard Watson <waty <at> bigpond.net.au> writes:


> Hi - I'm getting vastly different performance results on hda (master) as
> opposed to hdb (slave). 
> Any suggestions would be appreciated. 

I'd make sure you read the man page on hdparm. Certain actions can kill hardware,
permanently. 

That said, what I do is set the hdparms in /etc/conf.d/hdparm. I believe you
can test each drive, note the best (safe) parameters to adjust. Test the
adjustments, and then make an entry, per hard drive in the
/etc/conf.d/hdparm. Here's what works for me on one system:

all_args="-d1"
hda_args="-d1 -u1 -c1 -a256"


Remember, any device that is seen as a /dev/hd* will be affected by 
settings like [all_args="-d1"]......

If get lesser performance when (2) different drives are on the same
(ide/ata/eide) controller, then try a second pci cotroller card.
or if both are on the same cable, and the MB or controller has a 
second port, add a second cable and move one drive to the other 
port/cable. This sort of performance degradation should effect both drives. 

HTH

James

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