[Okta Webinar] Learn how to a build a cloud-first strategyRegister Now

x
?
Solved

How data is stored on a backup tape.

Posted on 2004-09-26
3
Medium Priority
?
272 Views
Last Modified: 2010-04-10
Could someone help me to understand how Data is stored on a backuptape, How is it indexed. When doing a differential backup, is the tape formatted every  time it`s being read to? Should the tape be formatted now and then to avoid problems?  Why? And please give me all informations that You think is relevant to this topic.
0
Comment
Question by:TorgN
3 Comments
 
LVL 9

Expert Comment

by:cooledit
ID: 12158058
hi, there

Backup's is stored as single files on the tapes. The indexing is done by individual program's but in theory if you do a backup from Windows Native backup or let's say Veritas then each differental program's is capable of restoring the data.

For the differental backup the tape is not erased. If you wanna reuse tape's then it's better to format it, relabel it.
0
 
LVL 2

Accepted Solution

by:
cyrax earned 1000 total points
ID: 12158128
TorgN,

Data is stored on a backup tape sequentially. This means that data is written to the tape in one contiunous, long stream. It can be likened to the music on an audio tape that plays a song as the tape advances.

Indexing is used to provide a reference to all of the portions of data on the tape. If for example, a tape has a stream of data with each data portioned into five sections, labelled 1, 2, 3, 4, 5. If you wanted to access some particular data at portion '4' of the tape, the index will tell the operating system or backup/restore program where on the tape the data is located relative to the other data.

A differential backup on the other hand, looks at the current data being backed up and compares it with the records of the data on the tape. It will only back up the data that has changed.

Normally the tape will only be formatted if you specify it.

There are many resources on the Internet that explain backup methodologies. Here is one of them:
http://www.pctechguide.com/15tape.htm

Good luck!

-Cyrax-
0
 

Author Comment

by:TorgN
ID: 12158180
Thank you for the help it helped me understand the essense of Tape Backup :)
0

Featured Post

Get your Conversational Ransomware Defense e‑book

This e-book gives you an insight into the ransomware threat and reviews the fundamentals of top-notch ransomware preparedness and recovery. To help you protect yourself and your organization. The initial infection may be inevitable, so the best protection is to be fully prepared.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article is a collection of issues that people face from time to time and possible solutions to those issues. I hope you enjoy reading it.
This article will show you step-by-step instructions to build your own NTP CentOS server.  The network diagram shows the best practice to setup the NTP server farm for redundancy.  This article also serves as your NTP server documentation.
Viewers will learn how to connect to a wireless network using the network security key. They will also learn how to access the IP address and DNS server for connections that must be done manually. After setting up a router, find the network security…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

834 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question