Portal | Manuals | References | Downloads | Info | Programs | JCLs | Master the Mainframes
IBM Mainframe Computers Forums Index
 
Register
 
IBM Mainframe Computers Forums Index Mainframe: Search IBM Mainframe Forum: FAQ Memberlist Usergroups Profile Log in to check your private messages Log in
 

 

Difference between tape backup & DASD

 
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> JCL & VSAM
View previous topic :: :: View next topic  
Author Message
pranta

New User


Joined: 23 Feb 2006
Posts: 16

PostPosted: Fri Mar 16, 2007 3:25 pm    Post subject: Difference between tape backup & DASD
Reply with quote

Hi Friends,

1.Can you please let me know what is the difference between tape back up & DASD?
2.If a dataset is migrated then where does it reside?
3.When a job is trying to access a dataset where from it tries to access that(tape or DASD)?
4.What are possible places where a dataset can be available,,like tape,DASD,......?
Back to top
View user's profile Send private message

expat

Global Moderator


Joined: 14 Mar 2007
Posts: 8593
Location: Back in jolly old England

PostPosted: Fri Mar 16, 2007 3:33 pm    Post subject:
Reply with quote

1. Do you mean the difference between a tape backup and a DASD backup ? or a backup of a tape or DASD

2. Site specific, you will need to ask your storage guys about the way in which they have configured the ILM (Information Lifecycle Management) software, such as HSM, FDR/ABR, CA-DISK ............... etc. etc.

3. References the catalog to see what device the dataset resides on

4. Depends on your hardware availability, DASD, tape, optical volume
Back to top
View user's profile Send private message
murmohk1

Senior Member


Joined: 29 Jun 2006
Posts: 1439
Location: Bangalore,India

PostPosted: Fri Mar 16, 2007 3:34 pm    Post subject:
Reply with quote

Pranta,

Quote:
If a dataset is migrated then where does it reside?


The dataset moves from DASD to tape volume.

Quote:
When a job is trying to access a dataset where from it tries to access that(tape or DASD)?

Depending on the catalog entry or volume information you provided in the JCL, job access either DASD or tape.

Quote:
What are possible places where a dataset can be available,,like tape,DASD,......?


Dint understand the question properly. But, it can be on optical disks also besides tape and DASD.

Quote:
Can you please let me know what is the difference between tape back up & DASD?

DASD is like a Hard disk on the PC, tape are tapes (as the name say). DASD access is faster than tape.
Back to top
View user's profile Send private message
pranta

New User


Joined: 23 Feb 2006
Posts: 16

PostPosted: Fri Mar 16, 2007 3:38 pm    Post subject:
Reply with quote

thanks a lot to all for the response
Back to top
View user's profile Send private message
expat

Global Moderator


Joined: 14 Mar 2007
Posts: 8593
Location: Back in jolly old England

PostPosted: Fri Mar 16, 2007 3:46 pm    Post subject:
Reply with quote

Quote:
Quote:
If a dataset is migrated then where does it reside?

The dataset moves from DASD to tape volume.


And if ML2 is defined as DASD, then the dataset will reside on DASD. As I said, that is site specific and depends entirely on how the ILM software has been configured. I've worked at two sites that use DASD ML2.
Back to top
View user's profile Send private message
murmohk1

Senior Member


Joined: 29 Jun 2006
Posts: 1439
Location: Bangalore,India

PostPosted: Fri Mar 16, 2007 4:02 pm    Post subject:
Reply with quote

Quote:
And if ML2 is defined as DASD, then the dataset will reside on DASD. As I said, that is site specific and depends entirely on how the ILM software has been configured. I've worked at two sites that use DASD ML2.


Thanks for the updates Expat. I was in an impression, that dataset moves to tape upon migration.
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 -> JCL & VSAM All times are GMT + 6 Hours
Page 1 of 1

 

Search our Forum:

Similar Topics
Topic Author Forum Replies Posted
No new posts Length of Tape file Mohan Kothakota JCL & VSAM 9 Thu Apr 20, 2017 10:24 pm
No new posts Difference between TWALENG and TWASIZE Arunkumar Chandrasekaran CICS 3 Tue Jan 03, 2017 12:57 pm
No new posts TAPE VERIFY utility?? MrExtraordinare JCL & VSAM 3 Fri Dec 09, 2016 10:57 pm
No new posts IMS Database backup info ashek15 IMS DB/DC 14 Wed Nov 16, 2016 5:29 am
No new posts Sticky: difference between ... DUMMY ... and ... enrico-sorichetti JCL & VSAM 0 Mon Oct 17, 2016 4:31 pm


Facebook
Back to Top
 
Mainframe Wiki | Forum Rules | Bookmarks | Subscriptions | FAQ | Tutorials | Contact Us