On 2 Aug 2013 18:09, "DJ Delorie" <dj@xxxxxxxxxx> wrote:
>
>
> > > The fastest disk I/O on trimslice, based on my testing, is via iSCSI
> > > over the ethernet port. It can do gigE (125MByte/sec) where usb/sata
> > > on arm seems to be limited to 27 MByte/sec or so (37 MByte/sec on
> > > intel i7).
> >
> > Are you really MB/s rather than IOPS bound?
>
> 37 MBytes/sec is close to the USB480 limit, considering overhead, I
> think. I don't know why the arm devices seem to be limited to 27
> MBytes/sec on USB disks, but those were the numbers I saw.
Mbps is not directly relates to IOPS ultimately you could have 16gbps fcp interface but if the storage attached to that is slow without decent caching etc the performance will still be terrible
Peter
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