We have a 979-400 with 2 gig memory and 24 mirrored drives (total of 42 in RAID 1 configuration with 3 hot spares). We bumped up our memory from 1 gig to 2 gig several months prior to the upgrade from 5.5 to 6.0, but to address a problem totally unrelated to the upgrade. We average about 230 user per day, but have had Disk I/O issues, also unrelated to the upgrade. HP told us that 1 gig would have been sufficient for the upgrade to 6.0. Our increase in memory was to address cache. Cynthia Bridges-Fowler MIS Operations Analyst IMC Salt, Inc., a division of IMC Global [log in to unmask] http://www.imcsalt.com >>> 47u <[log in to unmask]> 10/11/00 12:46PM >>> Sohrt, Jeff ([log in to unmask]) wrote: : Could those of you who've performed and upgrade from 5.5 or 6 -> 6.5 provide : some details as to memory requirements? : We're on a 989-4 processor with 1 gig memory, with 16 drives (8/8 mirror). : Our top # users is 100 and we never experience any performance issues. : In speaking to a member of the response center, he mentioned that he's never : seen anyone have to bump up memory to handle the 64 bit nature of 6.5. : While the memory sellers are advising at least 1 GIG per processor + extra : for OS, # users, # jobs etc. : Looking for some real world experience out there. : Thanks in advance. I can't offer you the real world experience you are looking for, but I will offer my perspective as the HP CSY person responsible for 6.5 performance. Here is an excerpt from my talk at HPWorld last month on this very subject: "Rumors that 6.5 takes huge amounts of memory to run are simply NOT true. Each user (session, network connection, or job) should require about the same amount of memory on 6.5 as on 5.5 or 6.0. The 6.5 operating system itself uses slightly more memory than 6.0, as should be expected when adding new features. "If your system has at least 128MB, and has enough memory to run well at all times on 5.5 or 6.0, and you are not changing anything else, then updating to 6.5 should NOT require more memory." Even though I work for a company that sells memory :), I can assure you that there is nothing about the "64-bit" nature of 6.5 that uses much memory. On a 1GB system, you are not going to notice a difference, assuming what you have said above, "we never experience any performance issues," is true now on 5.5. I wish you the best with whatever OS release you decide is best! Kevin Cooper HP CSY Performance Team [log in to unmask]