Data Domain: DD3300 Mapping disk alerts to the correct hard drive slot

Summary: On Data Domain DD3300 systems, disk failure alerts reference an enclosure and disk number (for example, Enclosure=1:Disk=18). These identifiers do not directly correspond to the physical slot numbers on the appliance. This article explains how to accurately map the alert information to the correct physical disk for replacement. ...

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Instructions

The DD3300 uses a customized Dell R740xd platform where physical slot numbering starts at 0, while Data Domain software identifies disks starting at 1. This mismatch causes confusion when correlating alert data to physical disk positions.

Understand Slot Numbering Differences on the DD3300.

  • Physical slots: Start at 0.
  • Software disk IDs: Start at 1 (format: Enclosure.Disk, e.g., 1.18).

Use the below charts to establish which disk to remove based on the disk identification information provided in the alert.
 

FRONT DISKS (facing front of appliance)
Software ID= disk 1.1

Physical slot = 0 (zero)		 Software ID= disk 1.4

Physical slot = 3		 Software ID= disk 1.7

Physical slot = 6		 Software ID= disk 1.10

Physical slot = 9
Software ID= disk 1.2

Physical slot = 1 		 Software ID= disk 1.5

Physical slot = 4		 Software ID= disk 1.8

Physical slot =7		 Software ID= disk 1.11

Physical slot = 10
Software ID= disk 1.3

Physical slot = 2		 Software ID= disk 1.6

Physical slot =5		 Software ID= disk 1.9

Physical slot = 8		 Software ID= disk 1.12

Physical  slot = 11

 

MIDPLANE DISKS (facing from front of appliance)
Software ID= disk 1.15

Physical slot = 14		 Software ID= disk 1.16

Physical slot = 15		 Software ID= disk 1.17

Physical slot = 16		 Software ID= disk 1.18

Physical slot = 17

 

REAR SSD (facing rear of appliance)
Software ID= disk 1.13

Physical slot = 12		 Software ID= disk 1.14
UNUSED for DD3300
Physical slot = 13

 

EXAMPLE:

  •  The Data Domain operating system posted the following disk failure alert.
Severity                       CRITICAL
Class                          HardwareFailure
Object                         Enclosure=1:Disk=18                             
Status                         active
Message                        Unable to access a disk and the disk state is missing.
Post Additional Information    EnclosureSerialNumber=NA:DiskSerialNumber=NA:FailureCode=NA
Clear Additional Information
Event Id                       EVT-STORAGE-00002                      
Event Name                     DiskFailure           
Description                    Unable to communicate with a disk. This disk cannot be used at this time.                                       
  • Determine the enclosure and slot information in the alert  --> in this case,  Enclosure=1:Disk=18 
  • Reference the layout tables (above) to determine which physical slot maps to the enclosure and disk slot information from the alert. 
    • 1 disk 18, is located in physical slot #17. 

    Mapping disk alerts to the correct hard drive slot can also be done using the CLI (command-line interface).
    Run the following commands to display the disk to slot-mapping information. 

    # alerts show current 
# disk show hardware detailed

      # alerts show current-detailed

    Severity                       CRITICAL
Class                          HardwareFailure
Object                         Enclosure=1:Disk=18
Status                         active
Message                        Unable to access a disk and the disk state is missing.
Post Additional Information    EnclosureSerialNumber=NA:DiskSerialNumber=NA:FailureCode=NA
Clear Additional Information
Event Id                       EVT-STORAGE-00002                      
Event Name                     DiskFailure           
Description                    Unable to communicate with a disk. This disk cannot be used at this time.

    # disk show hardware detailed

    ...
...
Configuration: 14 drives present.
Hardware disk information

Disk   Slot        Manufacturer/Model   Firmware   Serial No.       Capacity     Type
          (pci/idx)
----   ---------   ------------------   --------   --------------   ----------   --------
1.1    0           ST4000NM0295         DT31       ZC1241AL         3.63 TiB     SAS
1.2    1           ST4000NM0295         DT31       ZC1241DC         3.63 TiB     SAS
1.3    2           ST4000NM0295         DT31       ZC1241E2         3.63 TiB     SAS
1.4    3           ST4000NM0295         DT31       ZC1241D0         3.63 TiB     SAS
1.5    4           ST4000NM0295         DT31       ZC123C5V         3.63 TiB     SAS
1.6    5           ST4000NM0295         DT31       ZC123ZGP         3.63 TiB     SAS
1.7    6           ST4000NM0295         DT31       ZC12418K         3.63 TiB     SAS
1.8    7           ST4000NM0295         DT31       ZC124396         3.63 TiB     SAS
1.9    8           ST4000NM0295         DT31       ZC1241AS         3.63 TiB     SAS
1.10   9           ST4000NM0295         DT31       ZC1241B8         3.63 TiB     SAS
1.11   10          ST4000NM0295         DT31       ZC12S062         3.63 TiB     SAS
1.12   11          ST4000NM0295         DT31       ZC12PZ4J         3.63 TiB     SAS
1.13   12          MZ7KM480HMHQ0D3      GD53       S3BUNX0J600187   447.13 GiB   SATA-SSD
1.14   13          (absent)             (absent)   (absent)         (absent)     (absent)
1.15   14          ST4000NM0295         DT31       ZC12S0DD         3.63 TiB     SAS
1.16   15          ST4000NM0295         DT31       ZC12S05H         3.63 TiB     SAS
1.17   16          ST4000NM0295         DT31       ZC12S0M3         3.63 TiB     SAS
1.18   17          ST4000NM0295         DT31       ZC12S0F7         3.63 TiB     SAS            <<     Note that disk 1.18 maps to physical slot # 17
----   ---------   ------------------   --------   --------------   ----------   --------
Configuration: 18 drives present.

    Important:

    • Do not use disk show state for physical hard drive status; it only reports virtual device states.
    • For reconstruction status, check using iDRAC.

    # disk show state

    Dev     1  2  3  4  5  6  7  8  9  10
-----   ------------------------------
1-10    Y  Y  .  .  .  .  .  .  .  .
11-14   .  .  .  .
-----   ------------------------------

Legend   State           Count
------   -------------   -----
.        In Use Device   12
Y        System Device   2
------   -------------   -----
Total 0 disks and 14 devs

    Optional: Use Disk Beacon.
    To physically locate the disk, flash its LED - using the disks software ID (not the physical slot number):

    # disk beacon 1.18
Press Ctrl+C to stop beaconing.

    Affected Products

    Data Domain

    Products

    Data Domain, DD3300 Appliance
    Article Properties
    Article Number: 000009373
    Article Type: How To
    Last Modified: 16 Dec 2025
    Version:  6
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