Re: DMA on Friday night server

From: Greg Madden <pabi@acsalaska.net>
Date: Thu Jul 07 2005 - 21:20:23 AKDT

On Thursday 07 July 2005 08:04 pm, Damien Hull wrote:
> Damien Hull wrote:
> >I think I have DMA working on the Friday night server.
> >
> > hdparm -Tt /dev/hdb
> >
> > /dev/hdb:
> > Timing cached reads: 348 MB in 2.00 seconds = 173.68 MB/sec
> > Timing buffered disk reads: 64 MB in 3.09 seconds = 20.72
> > MB/sec [root@testb ~]# hdparm -v /dev/hdb
> >
> > /dev/hdb:
> > multcount = 16 (on)
> > IO_support = 0 (default 16-bit)
> > unmaskirq = 0 (off)
> > using_dma = 1 (on)
> > keepsettings = 0 (off)
> > readonly = 0 (off)
> > readahead = 256 (on)
> > geometry = 65535/16/63, sectors = 81964302336, start = 0
> > [root@testb ~]#
> >
> >"hdb" is where all the data is.
> >
> >---------
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> >with 'unsubscribe' in the message body.
>
> Here's more info.
>
> hdparm -i /dev/hdb
>
> /dev/hdb:
>
> Model=Maxtor 6Y080L0, FwRev=YAR41BW0, SerialNo=Y2MP82KE
> Config={ Fixed }
> RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
> BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16,
> MultSect=16 CurCHS=16383/16/63, CurSects=16514064, LBA=yes,
> LBAsects=160086528 IORDY=on/off, tPIO={min:120,w/IORDY:120},
> tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4
> DMA modes: mdma0 mdma1 mdma2
> UDMA modes: udma0 udma1 *udma2 udma3 udma4 udma5 udma6
> AdvancedPM=yes: disabled (255) WriteCache=enabled
> Drive conforms to: (null):
>
> * signifies the current active mode
>
> [root@testb ~]# hdparm -i /dev/hda
>
> /dev/hda:
>
> Model=Maxtor 83240D3, FwRev=NAVX171F, SerialNo=L326XNPA
> Config={ Fixed }
> RawCHS=6697/15/63, TrkSize=0, SectSize=0, ECCbytes=20
> BuffType=DualPortCache, BuffSize=256kB, MaxMultSect=16,
> MultSect=16 CurCHS=6697/15/63, CurSects=6328665, LBA=yes,
> LBAsects=6329388 IORDY=on/off,
tPIO={min:120,w/IORDY:120},http://www.pcguide.com/ref/hdd/if/ide/modesUDMA-c.html
> tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4
> DMA modes: mdma0 mdma1 mdma2
> UDMA modes: udma0 udma1 *udma2
> AdvancedPM=no WriteCache=enabled
> Drive conforms to: ATA/ATAPI-4 X3T13 1153D revision 7: 1 2 3
>
> * signifies the current active mode
>
>
> If anyone thinks I need to make changes let me know.
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http://www.pcguide.com/ref/hdd/if/ide/modesUDMA-c.html

The good news is that DMA is working, the not so good news is it is
operating in UDMA mode 2, 33MB/S, which is slow but depending on the
age of the box may be all it is capable of. Any hd faster than UDMA
mode 2 will require a 80 pin cable.

-- 
Greg Madden
Precision Air Balance, Inc.
Phone: (907)276-0461
email, confidential: pabi@acsalaska.net
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Received on Thu Jul 7 21:18:00 2005

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