Re: SW-RAID0 Performance problems

From: Andreas Peter (ujq7@rz.uni-karlsruhe.de)
Date: Sat Apr 14 2001 - 04:38:06 EST


Am Samstag, 14. April 2001 09:04 schrieb David Rees:

> OK, so it's not the RAID setup. There's two things that can cause this.
> One is that DMA is turned off (what does hdparm /dev/hda and hdparm
> /dev/hdc show?), the second was that the drives are on the same channel
> (which obviously isn't the case here). Can you verify that the drives are
> in DMA mode?

hdparm /dev/hda

/dev/hda:
 multcount = 16 (on)
 I/O support = 0 (default 16-bit)
 unmaskirq = 0 (off)
 using_dma = 1 (on)
 keepsettings = 0 (off)
 nowerr = 0 (off)
 readonly = 0 (off)
 readahead = 8 (on)
 geometry = 59556/16/63, sectors = 60032448, start = 0

the same on /dev/hdc

I played with different hdparm-settings, but it's not possible to speed up
the HDs

Andreas

-- 
Andreas Peter *** ujq7@rz.uni-karlsruhe.de

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