Hello All,
I have had several questions about TurboImage LFDS. I will first start with
a summary of Large File and follow with LargeFileDataSets.
Large File Functionality, 6.5 release.
by Craig Fairchild
Commercial Systems Division
Introduction
This document describes the changes to the MPE/iX operating system as a
result of the initial addition of Large File functionality. In this
document, Large Files are defined as any file greater than 4GB - 64KB
(4,294,901,760 bytes) which was the maximum file size prior to release 6.5.
For the sake of brevity, this value is referred to somewhat inaccurately
as "4GB" for the rest of this document.
Overview
The addition of Large File support to MPE/iX increases the maximum file
size supported by MPE/iX from the former limit of 4GB to 128GB for release
6.5. In the future, additional increases in supported file size can be
expected as customer needs demand.
For more details see: http://docs.hp.com/en/30216-90291/ch03s01.html
NOW for LFDS:So here's a summary.,
Large File Data Set (LFDS)
by Tien-You Chen, Commercial Systems Division
Overview
When TurboIMAGE was introduced, the size of a data set was limited to 4GB
(this was the MPE limitation until recently). When users demanded a larger
data set, JUMBO data set was introduced, which can have a maximum size of
396GB (max. size per chunk multiplied by max. no. of chunks = 4GB * 99 =
396GB). Jumbo and single file data set are functionally similar except for
dynamic expansion capability; while single file data set can grow
dynamically, jumbo data set cannot. Now, with the availability of LARGE
FILES (file greater than 4GB) on MPE, starting from version 6.5, we can
increase the limit on a single file data set to 128GB, which is now the MPE
file system limit.
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IF your site is currently using Jumbo data sets this may be a growth option.
You can't have LFDS co-exit with Jumbos within one database.
For more details at http://docs.hp.com/en/30216-90336/ch05s21.html
If you were considering this option it is not working at this time. The
lab is working on the problem and we hope to have something in the near
future. If you are interested in using this option and would like to be a
tester for the patch, please open a response center case.
I have created a note that explains some of the problem with LFDS datasets,
KBRC00016390/RCEN...it can be viewed on the ITRC.HP.COM knowledge database.
Best Regards
Cathlene Mc Rae
HP SR. Response Center Engineer
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