Robin H. Johnson wrote:
/dev/md2:
Timing cached reads: 2334 MB in 2.00 seconds = 1167.20 MB/sec
Timing buffered disk reads: 350 MB in 3.01 seconds = 116.32 MB/sec
It should exceed that speed - if I run hdparm -tT on 3 or more separate drives
in the array at the same time, their combined speed does not exceed 120Mb/sec
(a single drive manages 71Mb/sec) - The system does claim it negated at 3Gbit,
so I've wondering about a firmware bug in the sil24 or sil3726.
Thanks Robin.
I have seen reference to this performance limitation elsewhere:
http://www.barefeats.com/quick.html
and scroll down to the December 23rd 2006 entry.
"This is due to the fact that all current ExpressCard products use the
Silicon Image 3132 chip set and, for some reason, that's as fast as it
can go. Actually, the same is true of when the 3132 chipset is used in a
PCIe SATA host adapter for the Mac Pro."
Looks like bad silicon maybe?
Regards,
Richard
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