We help IT Professionals succeed at work.

online and offline SQL backup basics

252 Views
Last Modified: 2014-12-04
I am after an independent view of the following scenarios. There are a number of database (SQL Server) backups being written to the same drives as their live production database. Some of these servers are virtual (SAN storage) and others are physical (local storage).

Our DBA made the following comments:

This is more of a risk on physical servers (local storage) than virtual servers (SAN storage) – can anyone explain why?

They also claimed – if they are backing up the data to tape each night, what’s the real risk? I.e. if the drive housing both the data and backups did corrupt or did fail, as long as they have a backup on tape to which they can restore the backup of the data after the hardware/corruption fault has been rectified – is there really any risk?

What’s your view?
Comment
Watch Question

Vitor MontalvãoIT Engineer
CERTIFIED EXPERT
Distinguished Expert 2017

Commented:
This is more of a risk on physical servers (local storage) than virtual servers (SAN storage) – can anyone explain why?
If you loose your physical server you may loose your backups as well. The golden rule for backups is for not store the backups in the same place that your databases are.
For example, where do you store the copy of your house keys? If you let them inside of your house would be useless if you lost the original keys, right?

Author

Commented:
But if the data is first backed up to local drives, and then backed up to tape - whats the risk? As even if the drives with the live database and backups fail, then you can restore the data from tape?
John EastonDirector
Commented:
This one is on us!
(Get your first solution completely free - no credit card required)
UNLOCK SOLUTION

Author

Commented:
So all in all if you backup to tape, even if the same drive is housing both databases and online backups, there isnt much risk as you can restore from tape?
Vitor MontalvãoIT Engineer
CERTIFIED EXPERT
Distinguished Expert 2017
Commented:
This one is on us!
(Get your first solution completely free - no credit card required)
UNLOCK SOLUTION
ste5anSenior Developer
CERTIFIED EXPERT
Commented:
This one is on us!
(Get your first solution completely free - no credit card required)
UNLOCK SOLUTION
Senior DBA
CERTIFIED EXPERT
Most Valuable Expert 2018
Distinguished Expert 2019
Commented:
This one is on us!
(Get your first solution completely free - no credit card required)
UNLOCK SOLUTION

Gain unlimited access to on-demand training courses with an Experts Exchange subscription.

Get Access
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Empower Your Career
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Unlock the solution to this question.
Join our community and discover your potential

Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts.

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.