Disk access/MPT under ESX3.5

[Daniel Ponticello]

Much better:

endevor# camcontrol negotiate 0:0 -W 16 -O 127 -R 40.000
Current Parameters:
(pass0:mpt0:0:0:0): sync parameter: 8
(pass0:mpt0:0:0:0): frequency: 160.000MHz
(pass0:mpt0:0:0:0): offset: 127
(pass0:mpt0:0:0:0): bus width: 16 bits
(pass0:mpt0:0:0:0): disconnection is enabled
(pass0:mpt0:0:0:0): tagged queueing is enabled
endevor# camcontrol inquiry da0
pass0: <VMware Virtual disk 1.0> Fixed Direct Access SCSI-2 device
pass0: 80.000MB/s transfers (40.000MHz, offset 127, 16bit), Command 
Queueing Enabled
endevor# dd if=/dev/zero of=/var/tmp/dead.file bs=1024k count=1000
1000+0 records in
1000+0 records out
1048576000 bytes transferred in 20.364577 secs (51490193 bytes/sec)
endevor# dd if=/dev/zero of=/var/tmp/dead.file bs=1024k count=1000
1000+0 records in
1000+0 records out
1048576000 bytes transferred in 11.525560 secs (90978311 bytes/sec)
endevor# dd if=/dev/zero of=/var/tmp/dead.file bs=1024k count=1000
1000+0 records in
1000+0 records out
1048576000 bytes transferred in 11.833996 secs (88607094 bytes/sec)
endevor# dd if=/dev/zero of=/var/tmp/dead.file bs=1024k count=1000
1000+0 records in
1000+0 records out
1048576000 bytes transferred in 12.779979 secs (82048335 bytes/sec)
endevor# dd if=/dev/zero of=/var/tmp/dead.file bs=1024k count=1000
1000+0 records in
1000+0 records out
1048576000 bytes transferred in 11.812926 secs (88765137 bytes/sec)

Also CPU system load is lower: 40% instead of 70% on dual cpu, and 23% 
instead of 50% on quad cpu.

Still not as fast as debian, but really really usable now =)

how i can make it mantain these settings at boot?

Also, do you know why the first dd was slower?

Thanks,

Daniel


Shunsuke SHINOMIYA ha scritto:
>  Hello, Daniel
>
>  Can you execute camcontrol with some parameters again?
>  For example, `camcontrol negotiate 0:0 -W 16 -O 127 -R 40.000'.
>
>   

-- 

WBR,
Cordiali Saluti,
 
Daniel Ponticello, VP of Engineering

Network Coordination Centre of Skytek

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