John P Donnelly wrote:
We are expanding our storage by 1.5TB…we have an option to make some of
this 3390-27 volumes…
We are looking for a best fit allocation for these volumes:
JES2, public, storage, paging, ML1?
Our concerns include duration of a full volume backup, device
response time, contention.
Our DBAs say they will not use for our IDMS databases…
Suggestions? Experiences? Advice?
1. Ask DBAs for justification. "Because we fear" is ...well ...not the best
answer.
2. I would use it for application files: VSAM, PS, HFS, etc. ML1 is good candidate as well.
3. I would avoid LARGE PS as JES2 spool, because it is relatively new feature. AFAIK there is no reason to use mod-27 for PAGE (size limit for pagesets). No reason for SYSRES and DLIB (mod-9 is big enough).
4. I don't know your DR plan, but you have to check it against volume size. If
you do remote copy, the answer is obvious.
You can see some opinions like "it's to large for us", "backup would take to much time", "we afraid about performance" etc. The same opinions can be found few years ago about mod-9.
Popular file size limits are 4GB for VSAM non-EA and 64k tracks for PS&PDS files. Both limits can be reached on mod-9 as well.
As a remainder: mod-27 is '-1' technology, now there is mod-54.
--
Radoslaw Skorupka
Lodz, Poland
--
BRE Bank SA
ul. Senatorska 18
00-950 Warszawa
www.brebank.pl
Sąd Rejonowy dla m. st. Warszawy
XII Wydział Gospodarczy Krajowego Rejestru Sądowego,
nr rejestru przedsiębiorców KRS 0000025237
NIP: 526-021-50-88
Według stanu na dzień 01.01.2007 r. kapitał zakładowy BRE Banku SA (w całości
opłacony) wynosi 118.064.140 zł. W związku z realizacją warunkowego
podwyższenia kapitału zakładowego, na podstawie uchwał XVI WZ z dnia 21.05.2003
r., kapitał zakładowy BRE Banku SA może ulec podwyższeniu do kwoty 118.760.528
zł. Akcje w podwyższonym kapitale zakładowym będą w całości opłacone.
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