Re: RAID 5 performance issue.

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Justin Piszcz wrote:
>On Fri, 5 Oct 2007, Dean S. Messing wrote:
>>
>> Brendan Conoboy wrote:
>> <snip>
>>> Is the onboard SATA controller real SATA or just an ATA-SATA
>>> converter?  If the latter, you're going to have trouble getting faster
>>> performance than any one disk can give you at a time.  The output of
>>> 'lspci' should tell you if the onboard SATA controller is on its own
>>> bus or sharing space with some other device.  Pasting the output here
>>> would be useful.
>> <snip>
>>
>> N00bee question:
>>
>> How does one tell if a machine's disk controller is an ATA-SATA
>> converter?
>>
>> The output of `lspci|fgrep -i sata' is:
>>
>> 00:1f.2 SATA controller: Intel Corporation 631xESB/632xESB SATA AHCI Controller\
>> (rev 09)
>>
>> suggests a real SATA. These references to ATA in "dmesg", however,
>> make me wonder.
>>
>> ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
>> ata1.00: ATA-7: WDC WD1600JS-75NCB3, 10.02E04, max UDMA/133
>> ata1.00: 312500000 sectors, multi 0: LBA48 NCQ (depth 31/32)
>> ata1.00: configured for UDMA/133
>> ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
>> ata2.00: ATA-7: ST3160812AS, 3.ADJ, max UDMA/133
>> ata2.00: 312500000 sectors, multi 0: LBA48 NCQ (depth 31/32)
>> ata2.00: configured for UDMA/133
>> ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
>> ata3.00: ATA-7: ST3500630NS, 3.AEK, max UDMA/133
>> ata3.00: 976773168 sectors, multi 0: LBA48 NCQ (depth 31/32)
>> ata3.00: configured for UDMA/133
>>
>>
>> Dean
>> -
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>>
>
>His drives are either really old and do not support NCQ or he is not using 
>AHCI in the BIOS.

Sorry, Justin, if I wasn't clear.  I was asking the N00bee question
about _my_own_ machine.  The output of lspci (on my machine) seems to
indicate I have a "real" STAT controller on the Motherboard, but the
contents of "dmesg", with the references to ATA-7 and UDMA/133, made
me wonder if I had just an ATA-SATA converter.  Hence my question: how
does one tell definitively if one has a real SATA controller on the Mother
Board?
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