Re: [SLUG] DMA off?

From: Eben King (eben1@tampabay.rr.com)
Date: Tue May 23 2006 - 11:48:20 EDT

On Tue, 23 May 2006, Jason Boxman wrote:

> Eben King wrote:
>> I have two (identical) hard drives. Every night, I have a cron job that
>> cats /dev/hda > /dev/hdb . Lately I've been finding DMA off at the
>> conclusion of this copy. From last night (this morning) in
>> /var/log/messages:
>>
>> May 23 06:08:20 pc kernel: hdb: dma_timer_expiry: dma status == 0x61
>> May 23 06:08:21 pc kernel: hdb: DMA timeout error
>> May 23 06:08:21 pc kernel: hdb: dma timeout error: status=0xd0 { Busy }
>> May 23 06:08:21 pc kernel: ide: failed opcode was: unknown
>> May 23 06:08:21 pc kernel: hda: DMA disabled
>> May 23 06:08:21 pc kernel: hdb: DMA disabled
>> May 23 06:08:21 pc kernel: ide0: reset: success
>>
>> Is it time to replace that drive?
>
> No.
>
> If its regular ATA, then they're on the same ATA ribbon and I'd try them on
> separate channels.

This is a new problem. They worked correctly for months. Originally, I had
them on separate channels (hda and hdc), but then I changed cases (from
mini-tower to tower) and the cable would not reach[1]. Are there longer
ATA cables available? If not, I'll try to make the cabling reach in a
sub-optimal arrangement.

> I suspect a master/slave issue of sorts. Do both drives support and run
> at the same Ultra DMA mode?

They're identical. If I took them out, I'd have to check the master/slave
jumpers to tell which is which.

root@pc:/usr/share/xscreensaver/dvd2b/stage/vcr# hdparm -i /dev/hda /dev/hdb

/dev/hda:

  Model=IC35L120AVV207-0, FwRev=V24OA63A, SerialNo=VNVD00G4CD51GX
  Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
  RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=52
  BuffType=DualPortCache, BuffSize=1821kB, MaxMultSect=16, MultSect=16
  CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=241254720
  IORDY=on/off, tPIO={min:240,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
  AdvancedPM=yes: disabled (255) WriteCache=enabled
  Drive conforms to: ATA/ATAPI-6 T13 1410D revision 3a:

  * signifies the current active mode

/dev/hdb:

  Model=IC35L120AVV207-0, FwRev=V24OA66A, SerialNo=VNVD06G4CYA17L
  Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
  RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=52
  BuffType=DualPortCache, BuffSize=1821kB, MaxMultSect=16, MultSect=16
  CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=241254720
  IORDY=on/off, tPIO={min:240,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
  AdvancedPM=yes: disabled (255) WriteCache=enabled
  Drive conforms to: ATA/ATAPI-6 T13 1410D revision 3a:

  * signifies the current active mode

It appears so.

[1] There are two DVD drives and two hard drives; HDs=hda & hdb, DVDs=hdc &
     hdd is the only way I could make the cables reach. 

-- 
-eben    ebQenW1@EtaRmpTabYayU.rIr.OcoPm    home.tampabay.rr.com/hactar

           Q: What kind of modem did Jimi Hendrix use?
           A: A purple Hayes.
-----------------------------------------------------------------------
This list is provided as an unmoderated internet service by Networked
Knowledge Systems (NKS).  Views and opinions expressed in messages
posted are those of the author and do not necessarily reflect the
official policy or position of NKS or any of its employees.

This archive was generated by hypermail 2.1.3 : Fri Aug 01 2014 - 19:18:22 EDT