>I'm currently working on a project where we have to dump on tape (3592 >Jaguar 2) about 6To in 6 hours (~1To/h). >We are using FICON Express 2Go connected on a z/800 mainframe. >Does anyone know the block size of an ADRDSSU physical dump? >We are wondering if we need or not software like ExHPDM (STK Product) >that is able to dump on cartdrige with a 256K blocksize. >Some people are saying that speed limit on an Ficon channel depending on >the blocksize of the data that was carrying on.
Rom - We use ExHPDM and have been happy with it. We move about 2.7Tb to six Escon attached 9840b drives in about 2 hours. Remember, however, that its a balancing act between your source disk speeds and the number and speed of the tape drives you have. Our source disk is two Escon attached STK arrays and we have another product feature called HSDM (High Speed Data Mover) which moves the data from disk to tape in its native compressed format. If you're not familiar with STK disk, the data is stored on the disk in a compressed format. So while we are logically moving 2.7Tb, we are only actually physically moving about 600Gb. We've pretty much balanced and maxed out the throughput of the arrays and drives through trial and error. We're running 42 concurrent FDR backups which are streamed to those six tapes drives by ExHPDM. So adding more drives does not get us any more speed - we would have to spread the data across more disk arrays or faster disk arrays, and then add more tape drives also to handle the throughput. What type of disk is your source data stored on? Hope the info is useful. Jeffrey Deaver, Senior Analyst, Systems Engineering 651-665-4231 ---------------------------------------------------------------------- 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
