Cheetah is not running as fast as it should

YoYo

What is this storage?
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May 20, 2004
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:-?
I've got a Cheetah ST118202LC 10kRPM, which depending on whose words you believe, should be able to deftly run at between 28.8Mbyte/sec to 80Mbyte/sec, but doesn’t seem like wanting to go any faster than 18 or 19 Mbyte/sec. This Cheetah has previously been struck down by a virus but has since recovered and hopefully nursed back to health (basically by administering a default parameters reload). Are there any vital signs and bodily conditions I should have checked and monitored, but missed to do so?

Any valuable advice and assistance from our learned practitioners in this forum would be gratefully appreciated.
 

Mercutio

Fatwah on Western Digital
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What are you using to benchmark? What kind of controller are you using? Do you have a Seagate drive or an OEM model? What else is on your cabling? What kind of cabling do you have?

Uh, we need a little more info.
 

YoYo

What is this storage?
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May 20, 2004
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4
Hello,
The following is an X-ray of the viscera of the animal. Is everything where they should be?

########################
Page 08 - Caching parameters
########################
*Initiator Control (IC)= 0 (0x0)
Abort Pre-Fetch (ABPF)= 0 (0x0)
*Caching Analysis Permit (CAP)= 0 (0x0)
*Discontinuity (DISC)= 1 (0x1)
*Size Enable (SIZE)= 0 (0x0)
*Write Cache Enable (WCE)= 1 (0x1)
Multiplication Factor (MF)= 0 (0x0)
*Read Cache Disable (RCD)= 0 (0x0)
Demand Read Rentention Priority= 0 (0x0)
Write Rentention Priority= 0 (0x0)
Disable Pre-Fetch Transfer Length= 65535 (0xFFFF)
*Minimum Pre-Fetch= 0 (0x0)
*Maximum Pre-Fetch= 65535 (0xFFFF)
Maximum Pre-Fetch Ceiling= 65535 (0xFFFF)
*Force Sequential Write (FSW)= 1 (0x1)
*Logical block cache semgment size (LBCSS)= 0 (0x0)
*Disable Read-Ahead (DRA)= 0 (0x0)
*Number of Cache Segments= 3 (0x3)
*Cache Segment Size= 24576 (0x6000)
Non-Cache Segment Size= 0 (0x0)

'*' entries are changeable.


Other label particulars of this patient:
Drive: Seagate Cheetah 18G
Model: ST118202LC (detected by HA bios as SX118202LS)
Firmware: B801 (diagnosed by SCSI utility as B808)
Serial number: LK588967
Part number: 9J9006-422, Made in Singapore (=OEM)
Glist = 0
ETF defects = 1415

Host Adapter: Adaptec AIC7890AB
Host Adapter Bios: “589217rE9100(c)1999v2.20” shown on label; “Adaptec SCSI Bios v3.10 (c) 2001” displayed on post screen. (This adapter is also OEM)

Cabling: non-terminated 68-pin

Cable converter: 68-pin to 80-pin with a separate 4-pin power connector, and a 4-way jumper.

Other device: IMB LVD DXHS36D (may also be OEM)

Benchmark tools used: simple HDD tools downloaded.
 

timwhit

Hairy Aussie
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Jan 23, 2002
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You should definately have a terminator on the cable. This could possibly be what your problem is.
 

YoYo

What is this storage?
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May 20, 2004
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4
I had thought terminating at the HA should be sufficient, however tests using HD Tach v2.70 by www.simplisoftware.com gave the perplexing results below, so I’m still baffled.

IBM DXHS36D
test actions: random seek; read burst; read max
cable & HA terminated: 9.7ms; 27.7Mbyte/s; 20.4Mbyte/s
cable only terminated: 9.8ms; 27.7Mbyte/s; 20.3Mbyte/s
HA only terminated: 9.8ms; 43.1Mbyte/s; 20.4Mbyte/s

Cheetah ST118202LC
test actions:random seek; read burst; read max
cable & HA terminated: 8.2ms; 27.8Mbyte/s; 19.2Mbyte/s
cable only terminated: 8.4ms; 27.7Mbyte/s; 19.2Mbyte/s
HA only terminated: 8.6ms; 43.2Mbyte/s; 19.3Mbyte/s
 

The JoJo

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The cable must be terminated at both ends, the controller is usually the terminator at one end, but then you must deffinitely have termination at the other end.
 

YoYo

What is this storage?
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May 20, 2004
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4
The silver cable I used for the above-mentioned tests has four device connectors and (I think,) a passive terminator on it. Could this cable be specifically tuned for a 4-device setup, hence the drop in (read burst) performance in my 2-device arrangement test??
 

cquinn

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Mar 5, 2002
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Colorado
Passive termination is not good enough. And that is probably
not a cable that is rated for the higher spec speeds you are
trying to reach.
 
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