In a message dated 10/11/2005 11:25:20 A.M. Central Daylight Time, [EMAIL PROTECTED] writes:
>I'm curious ... what are you sharing your checkpoint volume with that would >make DEFRAGs necessary? I thought it was a bad idea to put it on a volume >with a lot of other activity. If you have a critically performance-sensitive data set, it is never a good idea to put it on a volume with ANY other allocated data set. If a seldom accessed file on the same volume is never accessed at all, it should be on tape and not on DASD. If it is accessed more often than never, then whenever it is accessed by some application then that application will very likely do its I/Os against that "seldom-accessed" data set just as fast as it possibly can. This will cause a serious, albeit possibly short-lived, performance problem for the critical loved one on the same volume. The best solution is to use a mini-volume with just enough space for the critical data set. If you know the other data set's usage pattern is not only very seldom but also random, then you might get away with putting it on a volume that holds a critical file but also has lots of empty space that you are tempted to try to fill up with "seldom-accessed" files. Bill Fairchild ---------------------------------------------------------------------- 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
