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Title
Jobs sit in "Waiting for media" for RAS devices, even when streams are available -
Description
When many backup jobs that target the same disk-based storage device are scheduled to start at the same time, or within a small window of time, the following issues occur:
- The target device is underused regarding the number of streams
- Some jobs remain in the "Waiting for media" state even if the device can run parallel jobs
- The completion time for small jobs increases by a few seconds or minutes
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Cause
These issues occur because the Media Manager uses a "quiesce time" setting to prevent assigning too many simultaneous jobs to a disk-based backup device. By default, the quiesce time is set to 10 seconds. Thus, after a job is assigned to a disk-based storage device, the Media Manager waits for 10 seconds before assigning the next job to the same device. You can change the default setting for quiesce time in the mediamgr.cfg file
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Resolution
To change the quiesce time for disk-based storage devices:
1. Open the mediamgr.cfg file in a text editor. You can find this file in <NetVault Backup home>\config on Windows and <NetVault Backup home>/ on Linux.
2. Change the value for the following entry:
[Media Requests: RAS quiesce time]
Type=Range
Range=0,1000
Value=10
*The default value is 10. To start the jobs at the sime time, set the value to 0 (Value=0).
3. Save the file
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Additional Information
Note the following: - This setting applies to all disk-based storage devices (DR Series Systems, EMC Data Domain Systems, and NetVault SmartDisk devices.) - For shared NetVault SmartDisk devices, this value cannot be set to 0