I don't believe this is true. I know that Db2 will only "pre-format" a subset of pages when it opens a newly created LDS, or adds a new extent, rather than pre-formatting the entire dataset/extent.
Wayne Driscoll Rocket Software Note - All opinions are strictly my own. -----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Mike Schwab Sent: Friday, May 15, 2020 12:15 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Does allocating an HFS or zFS erase all existing data?intervals formatted? EXTERNAL EMAIL All VSAM datasets including Linear are formatted when created. The disk space used is not allocated to any other datasets. Previous data left by deleted datasets is usually left in place (erase on delete is an option but not used frequently) but frequently overwritten in a short time so restoring a deleted data set is almost always impossible. On Fri, May 15, 2020 at 4:25 PM Seymour J Metz <sme...@gmu.edu> wrote: > > I want to edit the wiki article [[Disk formatting]] to clarify the > statement "s a general rule,[nb 1] formatting a disk erases most if > not all existing data on the disk medium". Normally I would consult > the logic manuals :-( > > When you allocate an HFS or linear data set, does AMS preformat all of the > tracks? When you format a zFS, does that force formatting of all tracks? Can > you provide references that I can cite for the answers? > > Thanks. > > > > -- > Shmuel (Seymour J.) Metz > https://nam01.safelinks.protection.outlook.com/?url=http:%2F%2Fmason.g > mu.edu%2F~smetz3&data=02%7C01%7C%7C421a17b8a7be4aed45fb08d7f8f37cf > 4%7C79544c1eed224879a082b67a9a672aae%7C0%7C0%7C637251596968251708& > sdata=GI0Z4yvHlBuwKVQ3%2BJntG4HzfTreMlSIDJsPQ9PwjXE%3D&reserved=0 > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ================================ Rocket Software, Inc. and subsidiaries ■ 77 Fourth Avenue, Waltham MA 02451 ■ Main Office Toll Free Number: +1 855.577.4323 Contact Customer Support: https://my.rocketsoftware.com/RocketCommunity/RCEmailSupport Unsubscribe from Marketing Messages/Manage Your Subscription Preferences - http://www.rocketsoftware.com/manage-your-email-preferences Privacy Policy - http://www.rocketsoftware.com/company/legal/privacy-policy ================================ This communication and any attachments may contain confidential information of Rocket Software, Inc. All unauthorized use, disclosure or distribution is prohibited. If you are not the intended recipient, please notify Rocket Software immediately and destroy all copies of this communication. Thank you. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
