[NAS Backup] Suppress Errors in Disk Usage Calculation that Caused Backup to Fail.

[daviftorres]

Description

This PR...

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[daviftorres]

This is the equivalent command for applying the fix:

sed -i 's_du -sb $dest | cut -f1_du -sb $dest 2>/dev/null | cut -f1 || true_g' /usr/share/cloudstack-common/scripts/vm/hypervisor/kvm/nasbackup.sh

We haven't confirmed the exact root cause of the du failure yet. As a precaution, we applied this fix to all servers and will monitor backups over the next few days.