NetWorker DD Boost Volumes are Going in Read-only Mode

Summary: Disk type volumes are found in read-only mode. The scanner command did run.

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Symptoms

Volumes are found to be read-only: 
$ /usr/sbin/mminfo -aVm -q "readonly"
state volume written (%) expires read mounts capacity flags
myvolume.123 42 TB 100% 01/28/2029 0 KB 19 0 KB r
  Message in daemon log: 
07/26/2025 05:46:21 AM 0 1249888000 6096 nsrmmdbd Volume DB.104 mode changed to read-only.
The volume cannot be used for backup, and cleanup does not run.

Message in daemon log: 
185765 2025-07-26 08:08:15 AM  2 5 0 3567675136 8898 0 myserver nsrsnmd NSR warning The 'read only' flag is set for the volume myvolume.123. Cannot recover space from the device mydevice.

Cause

Volumes are set to read-only when the scanner command runs. This is by design to support any Disaster Recovery scenarios.

Resolution

Note: The volume can be changed back to not read-only after it is confirmed that no other scanner runs or maintenance activities are in progress or needed.

With NMC:
  1. Check the volume status: NMC > Disk Volumes
Volume Status
  1. Unmount the device: NMC > Devices > Devices > select the device > right click the device > unmount
Unmount the device
  1. Change volume back to appendable: NMC > Disk Volumes > right click the volume > change mode > Appendable
Change volume back to appendable
 
volume status after change
  1. Mount the device: NMC > Devices > Devices > select the device > right click the device > mount 
Mount the device

With CLI:
Run the following: 
$   scanner -i -F -m -S 465737716 dev202
8909:scanner: using 'dev202' as the device name
8936:scanner: scanning Data Domain disk RL.202 on dev202
8939:scanner: Data Domain disk RL.202 already exists in the media index
29485:scanner: ssid 465737716: scan complete
8786:scanner: ssid 465737716: 498 KB, 23 file(s)

$  /usr/sbin/mminfo -aVm -q "readonly"
 state volume                  written  (%)  expires     read mounts capacity flags
       RL.202                  6997 KB 100%  10/31/25    0 KB     7      0 KB r

$  nsrmm | grep RL.202
Data Domain disk RL.202 mounted on dev202, write protected

$  nsrmm -y -u RL.202
Unmounted device: dev202

$  nsrmm -y -o notreadonly RL.202

$  nsrmm -y -m -f dev202
Data Domain disk RL.202 mounted on dev202, write enabled

Affected Products

NetWorker

Products

NetWorker Family
Article Properties
Article Number: 000376204
Article Type: Solution
Last Modified: 06 Nov 2025
Version:  2
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