I would like think you can use many dd proc for testing....and test dd use
raw device, can u give more infomation about multipath -ll -v3, iscsi
connection status in testing and NIC ip address and topology ? and like
iostat -x -d ....

2008/12/10 Ulrich Windl <[EMAIL PROTECTED]>

>
> On 9 Dec 2008 at 2:24, [EMAIL PROTECTED] wrote:
>
> >
> >
> >
> > > 2) our next problem is multipath. When we configure multipath, over
> > one NIC with dd we get 90 MBps read, but over 2 NICs just 80 MBps what
> > is strange. On
> > > switch and SAN we see that data flow is over both NICs, but dd shows
> > still 80 MBps.
>
> Hi, I'm by no ways a guru on iSCSI, but did you have a look at top(1) while
> performing the tests? How busy ist the CPU? How are the other CPU states,
> and how
> many I/O tasks are running? Probably the best way to test multipathing is
> to use a
> fast device with multiple slow channels. If performance doesn't improve,
> there's
> something quite wrong. MHO...
>
> Regards,
> Ulrich
>
>
> >
>

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