Hal, There's nothing wrong with stripes over stripes. I've referred to this as braiding in the past.
With a good pre-fetch algorithm the storage uses the parallelism of the striped arrays to feed the cache in large block requests from many disks, and in turn the RAID-0 dataset can feed the sequential read process by pre-fetching from many concurrent volumes and paths. Braiding is a good thing. It is heavily used in UNIX land, Not so common on Windows, and unfortunately (for some unknown reason) strangely rare in MVS. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of Hal Merritt > Sent: Tuesday, April 08, 2008 8:57 AM > To: IBM-MAIN@BAMA.UA.EDU > Subject: Re: [IBM-MAIN] Sequential Data Striping > > What kind of hardware? Some modern DASD is already striped. More, a > 'volume' is just a logical construct that often spans physical volumes. > > If you are looking for performance, half track blocking (BLKSIZE=0) and > lots of buffers has worked really, really well for me. > ---------------------------------------------------------------------- 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
