Tsai Laurence wrote: > Dears, > Would like to know if any of your shop running the 3390-27 . If yes, why > do you use it ? If no , why dont you use it ? > Any consideration of performance , system administration , s/w limitation ?
1. It is worth to mention, there's no 3390-27. What we have is *so called* 3390-27. Difference: anybody can use -27 and mean a little bit different thing. 2. Pro's. Less I/O addressed used. The only way to exploit large disk systems capacity - addressing limitations apply to number of volumes, not size. With PAV is doesn't hurt to have large volumes. BTW: 'large' is not good word, when we compare it to contemporary regular PC disks. 3. Con's. See 1. - it is not a standard. Someone can create 32760 Cyl device, which is a max for mod-27 (caution: we also have mod-54 now!). Someone else can create 32000 cyl device. Usually it is not a problem. The problem when restoring full volume dump or establish remote copy (i.e. PPRC) pairs. BTW: some PPRC, FlashCopy etc. functions can be limited when using large volumes. -- Radoslaw Skorupka Lodz, Poland ---------------------------------------------------------------------- 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
