Around 8 heads, each with 4x10G connections, and then 10G connections to downstream integrated blade centre switches where the hosts reside. A handful of hosts will have 1G connections (landing on the FEXes)
The heads will be distributed across four 5548P, and the hosts/blade centres and connected to 2232PP FEXes. I'd have to dig around to get some expected IO figures for the storage; it will very likely be a fairly even split between reads/writes. Cheers, Matt On 5 August 2011 13:56, John Gill <johg...@cisco.com> wrote: > Matthew, > When you say a large deployment, can you describe the number of FEXes and > hosts? > Which model of FEX? > What speed are your heads, how many connections? > What speed are your hosts, how many connections? > Mostly reading, writing, random? > > You can increase the buffer size available per port on the FEXes, but it > would be good to know if this kind of configuration would be beneficial to > you. It would mean acting more in a shared manner - so any one transfer > will have access to more buffers, but there could be contention of those > buffers if every other port is also performing in the same manner. > > Regards, > John Gill > cisco > > > On 8/5/11 7:05 AM, Matthew Melbourne wrote: >> >> Hi, >> >> We're implementing two pairs of N5Ks (and downstream N2k FEXes) to act >> as separate iSCSI SAN fabrics, with SAN heads attached directly to >> N5Ks and host ports (and downstream integrated blade switches) >> connecting to the FEXes. Does anyone have any real-world experience of >> using N5Ks for a large iSCSI deployment. I have enabled jumbo frames >> through a network-qos policy-map as an obvious first-step, but wonder >> whether anything can be optimised by tuning buffer sizes to >> accommodate the bursty nature of iSCSI (etc)? This switches will only >> be switching iSCSI traffic. >> >> Cheers, >> >> Matt >> > -- Matthew Melbourne _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/