cancel
Showing results for 
Search instead for 
Did you mean: 

Verification of backup data

AndriiPushkarov
Level 4

Hi all,

1. How can you verify data immediately after backup?

Is there a ready-made solution for checking data integrity?

2. Type of backup “User Archive” whether it takes precedence over “User Backup” in terms of the reliability of the backup.

For example, an improved validation algorithm ...?

Andrii

4 REPLIES 4

StefanosM
Level 6
Partner Accredited Certified

What do you mean "Verify data immediately after backup" ?
If you want to compare the backed up data with the data on the disk, no you can not do that. I can not recall a backup software that will do that.

Netbackup can read the backup, compare the files with its database and guarantee that the expected files are in place and readable.
This can be done using the verify option in the GUI -> catalog or with the bpverify command. You can create a script that runs the bpverify command after the backup.
https://www.veritas.com/support/en_US/doc/123533878-127136857-0/v123545982-127136857
https://www.veritas.com/content/support/en_US/doc/24437881-126559615-0/v41507270-126559615

user archive and user backup are the same. But user archive deletes the files after a successful backup.

 

 

Nicolai
Moderator
Moderator
Partner    VIP   

Hi @AndriiPushkarov 

Verifications of backup is something that belongs to the past, where tape drive was unreliable. Today all moderne tape drives does automatic read after write to ensure data is correctly written.

Also a 1:1 compare is impossible, because no file system today is static, changes are written constant.

If integrigity if of your concern, perform restore test either bi-weekly or on a monthly basis.

Backup vs archive: The method to store data is the same, so reliability is the same, else what Stefanos said.

AndriiPushkarov
Level 4

Client - RHEL 7. Files will be deleted after backup.

We need to be sure that the data will be available for recovery.

Nicolai
Moderator
Moderator
Partner    VIP   

crc32 sum for all the files

Backup the files

Restore files to alternate location - perform CRC32 check again, and compare with result form first CRC32 run

Duplicate backup to second tape. Store the tape in different location.