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List:       linux-smp
Subject:    Re: fast drives.
From:       Eric NOULARD <Eric.Noulard () prism ! uvsq ! fr>
Date:       1999-09-30 5:44:32
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On Wed, Sep 29, 1999 at 07:52:44AM -0700, C Polisher wrote:
> Gregory Hosler wrote:
> > does anyone have experience w/ a large (9 Gb or larger) fast/wide drive,
> > running on a aic7xxx (obviously) at full speed (40 Mb/s), with tagged
> > queueing enabled.
> > 
> > The reason I ask is that I have a new IBM drive, I had to disable tagged
> > queueing, and further slow it down to 34 mb to eliminate any spurious errors
> > (that are otherwise described as "termination/cabling problems").
> 
> I've had no problems with the IBM 9.1GB SCSI,
> hope some of this info helps. Sounds very much like
> a cabling / termination problem. Are you using an
> active terminator on your SCSI chain?

	Just to approve this since I have similar setup.

distro: SuSE 6.1
kernel: 2.2.12 SMP 
motherboard: ASUS P2B-DS
drive:       IBM DDRS-39130D 

	The IBM drive is working perfectly at 80 MByte/sec,
with tagged command queue to 16.
Uptime is 6 days due to ... 'a power failure last week' ((:. 
Last manual reboot was for upgrading kernel :))).

	More detail info follows:	

Attached devices: 
Host: scsi0 Channel: 00 Id: 02 Lun: 00
  Vendor: IBM      Model: DDRS-39130D      Rev: DC1B
  Type:   Direct-Access                    ANSI SCSI revision: 02

cat /proc/scsi/aic7xxx/0 
Adaptec AIC7xxx driver version: 5.1.19/3.2.4
Compile Options:
  TCQ Enabled By Default : Enabled
  AIC7XXX_PROC_STATS     : Enabled
  AIC7XXX_RESET_DELAY    : 5

Adapter Configuration:
           SCSI Adapter: Adaptec AIC-7890/1 Ultra2 SCSI host adapter
                           Ultra-2 LVD/SE Wide Controller
    PCI MMAPed I/O Base: 0xe1800000
 Adapter SEEPROM Config: SEEPROM found and used.
      Adaptec SCSI BIOS: Enabled
                    IRQ: 11
                   SCBs: Active 0, Max Active 17,
                         Allocated 30, HW 32, Page 255
             Interrupts: 533388
      BIOS Control Word: 0x18a6
   Adapter Control Word: 0x1c5e
   Extended Translation: Enabled
Disconnect Enable Flags: 0xffff
     Ultra Enable Flags: 0x0000
 Tag Queue Enable Flags: 0x0004
Ordered Queue Tag Flags: 0x0004
Default Tag Queue Depth: 8
    Tagged Queue By Device array for aic7xxx host instance 0:
      {0,0,16,0,0,0,0,0,0,0,0,0,0,0,0,0}
    Actual queue depth per device for aic7xxx host instance 0:
      {1,1,16,1,1,1,1,1,1,1,1,1,1,1,1,1}

Statistics:

(scsi0:0:2:0)
  Device using Wide/Sync transfers at 80.0 MByte/sec, offset 15
  Transinfo settings: current(10/15/1/0), goal(10/127/1/0), user(10/127/1/0)
  Total transfers 510928 (255680 reads and 255248 writes)
             < 2K      2K+     4K+     8K+    16K+    32K+    64K+   128K+
   Reads:  164213   13171   16331   20572    6001    9881   25511       0
  Writes:  174203   27906   19142    4992    2938    2939   23128       0

-- 
        Eric NOULARD
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