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Which copies do people run varification on?

10 months ago
5 September 2023
6 replies
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Userlevel 4

+15

Ken_H
Byte
203 replies

Hello everyone,

I have a storage policy with three copies:

Primary on disk at my main data center
Secondary on disk at my DR site
Secondary on Metallic cloud storage

Following the failure to restore a production system last week it was found that none of my copies had verification enabled. My question is: Should I turn on verification for all three copies?

Any recommendations would be appreciated.

Ken

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Best answer by Collin Harper 7 September 2023, 17:28

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6 replies

Userlevel 2

Hi @Ken_H ,

Good day!

It’s good to run verification on the disk copies so that data integrity will be checked on the daily basis.

Not required to schedule a verification job for the metallic copy.

Hi @Ken_H,

Good day.

Please schedule the DDB verification for the disk copies.

Note: Due to the durable nature of cloud storage products, multiple replicas stored across availability zones, and the cost to perform read operations, data verification is not required for cloud libraries.

https://documentation.commvault.com/11.24/expert/12567_verification_of_deduplicated_data.html

Regards,

Wasim

Userlevel 5

+14

Collin Harper
Vaulter
489 replies
10 months ago
7 September 2023
Answer

Hello @Ken_H

DDB Data Verification is run on all DDBs (no matter the copy) by default based on a System Created DDB Verification schedule. While true that Cloud copies are less likely to have their “at-rest” data affected in some way, it is not impossible and on occasion does occur.

Note that with Cloud Copies you will be charged egress when running a DDB Verf from an on-prem MediaAgent so it is best practice to setup a Cloud-Based MediaAgent in the same region as the bucket to avoid egress charges.

There is no default or automatic verification for tape copies since 1) they do not have associated DDBs and 2) usually tapes are sent off-site so a non-DDB Data Verification usually is not feasible to run, though if you had all tapes in the library you can run a non-DDB Data Verification on-demand.

Thank you,
Collin