On 11/20/07, Asif Iqbal <[EMAIL PROTECTED]> wrote: > On Nov 20, 2007 7:01 AM, Chad Mynhier <[EMAIL PROTECTED]> wrote: > > On 11/20/07, Asif Iqbal <[EMAIL PROTECTED]> wrote: > > > On Nov 19, 2007 1:43 AM, Louwtjie Burger <[EMAIL PROTECTED]> wrote: > > > > On Nov 17, 2007 9:40 PM, Asif Iqbal <[EMAIL PROTECTED]> wrote: > > > > > (Including storage-discuss) > > > > > > > > > > I have 6 6140s with 96 disks. Out of which 64 of them are Seagate > > > > > ST3300007FC (300GB - 10000 RPM FC-AL) > > > > > > > > Those disks are 2Gb disks, so the tray will operate at 2Gb. > > > > > > > > > > That is still 256MB/s . I am getting about 194MB/s > > > > 2Gb fibre channel is going to max out at a data transmission rate > > around 200MB/s rather than the 256MB/s that you'd expect. Fibre > > channel uses an 8-bit/10-bit encoding, so it transmits 8-bits of data > > in 10 bits on the wire. So while 256MB/s is being transmitted on the > > connection itself, only 200MB/s of that is the data that you're > > transmitting. > > But I am running 4GB fiber channels with 4GB NVRAM on a 6 tray of > 300GB FC 10K rpm (2Gb/s) disks > > So I should get "a lot" more than ~ 200MB/s. Shouldn't I?
Here, I'm relying on what Louwtjie said above, that the tray itself is going to be limited to 2Gb/s because of the 2Gb/s FC disks. Chad Mynhier _______________________________________________ perf-discuss mailing list perf-discuss@opensolaris.org
