Data Domain: Filesystem Panic During PPDM Recipe Replication | mrepl_send_file: I/O error

Summary: Data Domain systems may experience repeated filesystem panics during recipe replication when using PowerProtect Data Manager (PPDM) backups. This occurs due to incorrect handling of zero-length base files created by PPDM’s capacity-optimized workflow. ...

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
Check out other resources

Symptoms

Filesystem panics repeatedly during mtree replication.
Error message in logs: 
PANIC: ddr/repl/lrepl_client.c: mrepl_send_file: 16629: repl ctx 10:22: mrepl_send_file: I/O error
Replication jobs fail with I/O errors.
System enters panic state to protect data integrity.

Cause

  • PPDM’s TDSM capacity-optimized workflow creates a zero-length backup that serves as a basefile for replication.
  • Replication code incorrectly interprets the zero-length basefile as corruption.
  • Data Domain reports this as an I/O error, triggering a DDFS panic to safeguard data integrity.

Resolution

Permanent Fix:

  • Issue resolved in the following DDOS releases:
    • 7.7.5.20
    • 7.10.1.10
    • 7.12.0.0 and later

Upgrade to one of these versions to prevent the panic condition.

Workaround:

  • Disable recipe replication on the source Data Domain system using SE mode.
  • A filesystem restart is not required.
  • Important: SE commands have been deprecated in:
    • DDOS 7.7.5.25
    • DDOS 7.10.1.15
    • DDOS 7.13.0.15
    • DDOS 6.2.1.110 and above
  • SE commands are accessible only by Dell employees.
  • Contact Dell Support to apply the workaround - Reference this KB article (#000217104) to expedite resolution.

Affected Products

Data Domain, DD OS, DD OS 7.10, DD OS 7.11, DD OS 7.7, DD OS 7.8, DD OS 7.9
Article Properties
Article Number: 000217104
Article Type: Solution
Last Modified: 18 رجب 1447
Version:  4
Find answers to your questions from other Dell users
Support Services
Check if your device is covered by Support Services.