On Wed, 2 Jan 2008 22:16:04 -0800, shai hess <[EMAIL PROTECTED]> wrote:
> Yes, if you need local 3390 it is faster to use directly connect >FICON/ESCON real 3390. Using TCP with MFNetDIsk is a feature which nobody >have and I really do not like to be one of a many OEM which use the real >3390 and by that have limitation which i do not have, like remote 3390 disk, >DR, uses all PC features, PC backup and more. > You know many people who backup PC hard drives? To what? And some kind of synchronized backup so when multiple restores need to be done the application still works. ><Obviously performance would suffer depending on the >available bandwidth for remote TCPIP transmission of IO but for an >absolute DR capability, the product has many facets I can visualise. > >Yes, TCP is a problem like the Hard disk in the past was a problem when try >to use it in EMC, IBM and more to emulate 3390 disks but now everyone use >Hardisk to do the emulation. I know that TCP is faster and faster everyday. >IBM must do more to make the TCP the same faster. TCP is a protocol, how do you make it faster? Can you make English faster? The network speed will not be faster than your your slowest link. The mainframe is about doing thousands of things per minute, NFS works because it was not trying to handle the same workload as the mainframe. I suppose if I care about speed then I must run my own intra-net wiring where I can control the traffic on the wiring. The minute I use the inter-net, I am subject to routing beyond my control. IP V6 with prioritizing is not going to get sub- second response time between a mainframe on the west coast of USA and a PC file in Nepal because all the links i between are not going to give a hoot that 'my' trafficreally is more important than 'your' traffic. Sounds like you have a niche product for the home hobbyist, like Hercules. Hercules on a PC is not expected to handle millions of credit card transactions per day. NFS on the mainframe gives access to a network file, there is no claim you will get performance above what the slowest can give. Therefore, time sensitive transactions do not store their data on NFS disk files. Those shops who are looking to have 'instant' disaster recovery already need speed, reliability, and support. What happens to the application when those PC's and their drives start failing? >About TCPIP bandwidth, Yes if you have slower TCP lines, MFNetDisk >will work slowly, But in today cost everyone can have faster TCP connection. > ><but for an >absolute DR capability, the product has many facets I can visualise. > >Thanks. > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
