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STATUS CODE: 84 "media write error." When a disk storage unit in a storage unit group is 100% full, NetBackup will not select the next disk storage unit.

Article: 100016402
Last Published: 2025-09-09
Ratings: 13 14
Product(s): NetBackup

Problem

When a disk storage unit in a storage unit group is 100% full, NetBackup will not select the next disk storage unit.

Error Code:

STATUS CODE: 84 "media write error."

Cause:

In a storage unit group, disk storage units and media manager storage units do not behave the same.

Solution

NetBackup is working as designed.
 
When a disk storage unit in a storage unit group fills up (100% full), NetBackup will not select/fail over to the next disk storage unit in the storage unit group.
  • The job will fail with a status 84.
When a storage unit group is used in a policy, NetBackup uses the first storage unit listed if the storage unit is available.
  • If the first one is not available, NetBackup attempts to use the second storage unit listed, and so forth down the list.
  • When a disk storage unit becomes full, the next disk storage unit is made available to NetBackup.
  • Therefore NetBackup will continue to use the proceeding disk storage units in it's list.
It is not recommended to use a disk storage unit in storage unit groups if you expect the policy to use the next disk storage unit when the first disk becomes full.
  • It is recommended to manually change the disk storage unit priority instead.

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