RWWMAINT@MSU.BITNET (Rich Wiggins) (02/02/90)
Does anyone out there make use of disk controllers with cache on systems running Notis? I'm curious if time-consuming tasks such as index builds run faster in such an environment. (The rule of thumb is that I/Os that move through large datasets without dwelling in one area of disk are usually not good cache candidates.) How about solid-state DASD? Anybody use such devices to speed up Notis? How about running VSE or MVS as a guest of VM/XA, with minidisk caching in expanded storage? If anyone is benefitting from these various giant versions of RAM disks, it'd be interesting to learn about it. Thanks. /Rich Wiggins Michigan State U
ADLB001@MVS.MCGILL.CA (Ron Johnston) (02/03/90)
The best way to speed up NOTIS indexing jobs is to increase the VSAM buffering.
HARRY@MARIST.BITNET (A. Harry Williams) (02/03/90)
On Fri, 2 Feb 90 08:58:19 EST Rich Wiggins said: >How about running VSE or MVS as a guest of VM/XA, with minidisk caching >in expanded storage? Since the I/O will be via SIO(F) or SSCH and not DIAG, VM/XA SP2's mini disk caching will not cache that I/O. It also must be a 4K I/O for it to be cached, ie it is aimed mainly at CMS I/O. I was hoping that this was not the case since one of our biggest I/O bottlenecks is an index file. I guess its time to look at 3880-23 or 3990s. > >If anyone is benefitting from these various giant versions of RAM disks, >it'd be interesting to learn about it. Thanks. > >/Rich Wiggins > Michigan State U /ahw