Portal | Manuals | References | Downloads | Info | Programs | JCLs | Mainframe wiki | Quick Ref
IBM Mainframe Computers Forums Index
 
Register
 
IBM Mainframe Computers Forums Index Mainframe: Search IBM Mainframe Forum: FAQ Memberlist Profile Log in to check your private messages Log in
 
Recovery of dataset Once the dataset is deleted

 
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> Mainframe Interview Questions
View previous topic :: :: View next topic  
Author Message
deepak.kec

New User


Joined: 26 Feb 2007
Posts: 71
Location: bangalore

PostPosted: Mon Apr 02, 2007 6:11 pm    Post subject: Recovery of dataset Once the dataset is deleted
Reply with quote

Once the dataset is deleted --- Can they be recovered again? How?
Back to top
View user's profile Send private message

expat

Global Moderator


Joined: 14 Mar 2007
Posts: 8620
Location: Back in jolly old England

PostPosted: Mon Apr 02, 2007 6:34 pm    Post subject:
Reply with quote

Only if a backup exists.

The recovery method is dependant entirely on the backup method used.
Back to top
View user's profile Send private message
dick scherrer

Site Director


Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Mon Apr 02, 2007 9:20 pm    Post subject:
Reply with quote

Hello,

If you talk with your sdtorage management people, they can tell yo if there is a backup and how to retrieve it.
Back to top
View user's profile Send private message
Ranjanapai

New User


Joined: 21 Mar 2007
Posts: 3
Location: India

PostPosted: Tue Apr 03, 2007 3:23 pm    Post subject: Re: Recovery of dataset Once the dataset is deleted
Reply with quote

Try giving HRECOVER command followed by th data set name in ispf screen. if the back up is not available, the recovery process will b failed. this command works if u try this immediately with in a day after deleting the dataset.
Back to top
View user's profile Send private message
dick scherrer

Site Director


Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Tue Apr 03, 2007 7:39 pm    Post subject:
Reply with quote

Hello,

This works only if the file has been backed up. . . The best hope is that the file was created long enough ago that it made it to the volume backups (if the site does volume backups).

The amount of time since deletion will not make a difference.
Back to top
View user's profile Send private message
expat

Global Moderator


Joined: 14 Mar 2007
Posts: 8620
Location: Back in jolly old England

PostPosted: Tue Apr 03, 2007 7:55 pm    Post subject:
Reply with quote

The volume dumps can be funny little critters ...... if they are specifically offsite dumps, then they are usually defined as not eligible for dataset restore. If the dataset is on one of these dump volumes and the dump was processed by HSM with DFdss specified as the default datamover, then you could feed the dump volume(s) into a DFdss job to recover it. You might have to get the tapes brought back onsite first though.

Quote:
The amount of time since deletion will not make a difference.

That depends on how frequently the storage people process the EXPIREBV function of HSM, or if your shop uses another ILM software how the backup retention is defined.
Back to top
View user's profile Send private message
dick scherrer

Site Director


Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Tue Apr 03, 2007 8:34 pm    Post subject:
Reply with quote

Hello,

My bad - the intended point was that a recent deletion is not related to recurring backups (actually what i might also have added was that if the file was new, and had not yet been backed up, there may be no way to get it back).

As far as restore eligible, i've not yet had a dataset that was on backup media that could not be gotten back - might take a bit of work, but was always retrievable.

Indeed, would a backup that could not be recovered be a write-only file?

As a complete aside, i was in a meeting once where several (senior corporate manager) folks voiced their concern that a particular bit of data was extremely needing of protection. A good friend suggested that it be put in a write-only file that could not be re-read. A few of the "big suits" took the bait and the meeting degraded from there when realization struck that they'd been had. . . icon_smile.gif
Back to top
View user's profile Send private message
expat

Global Moderator


Joined: 14 Mar 2007
Posts: 8620
Location: Back in jolly old England

PostPosted: Wed Apr 04, 2007 12:51 pm    Post subject:
Reply with quote

Quote:
As far as restore eligible, i've not yet had a dataset that was on backup media that could not be gotten back - might take a bit of work, but was always retrievable.

Yes, that was the point I was making. The reason that offsite dump volumes are marked as not eligible for dataset restore is that otherwise HSM would attempt to use them if a dataset restore was required for a dataset on those dump volumes.

Of course the easiest way would be for the tapes to be brought back onsite, the storage people change the dump class definition to eligable and then run the restore.
Back to top
View user's profile Send private message
View previous topic :: :: View next topic  
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> Mainframe Interview Questions All times are GMT + 6 Hours
Page 1 of 1

 

Search our Forum:

Similar Topics
Topic Author Forum Replies Posted
No new posts File Tailoring -- Temporary dataset i... samzee71 CLIST & REXX 3 Fri Dec 01, 2017 3:12 am
No new posts Copy 4 byte of data from the last rec... arunsoods DFSORT/ICETOOL 9 Fri Oct 06, 2017 12:15 pm
No new posts opening a dataset after reading it fr... arunsoods DFSORT/ICETOOL 5 Wed Oct 04, 2017 3:54 pm
No new posts Updating the Trailer count in variabl... satheshbabur DFSORT/ICETOOL 6 Wed Aug 30, 2017 9:49 pm
No new posts Mainframe dataset split purushottam DFSORT/ICETOOL 13 Tue Aug 29, 2017 12:28 pm

Facebook
Back to Top
 
Job Vacancies | Forum Rules | Bookmarks | Subscriptions | FAQ | Polls | Contact Us