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- Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
- Path: sparky!uunet!paladin.american.edu!auvm!VCUVM1.BITNET!SSTSZXF
- Message-ID: <IBM-MAIN%92072210340646@RICEVM1.RICE.EDU>
- Newsgroups: bit.listserv.ibm-main
- Date: Wed, 22 Jul 1992 11:22:09 EDT
- Sender: IBM Mainframe Discussion list <IBM-MAIN@RICEVM1.BITNET>
- From: Zoltan Forray <SSTSZXF@VCUVM1.BITNET>
- Subject: Re: 3390 blksize calculation
- In-Reply-To: Message of Tue, 21 Jul 1992 20:20:35 -0500 from <CCENGNM@NUSVM>
- Lines: 12
-
- Until IBM decides that everything should be kept in linear datasets (where
- everything looks like a "page") blocksizes determine storage utilization and
- i/o performance.
-
- For instance, on 3480 type media, IBM recommends using the maximum blocksize
- that you can, the closer to 32K the better. In fact, they say if using less
- than 4K blocks will actually use more 3480 cartridge media than and equivalent
- 3420 reel tape.
-
- For 3380 type disks, a half-track block (23400) is usually optimal for most
- things like load libraries. If you used anything much larger, you would waste
- a large amount of space on each track.
-