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Advanced O&M Command Reference

OceanStor 18000 and 18000F V5 Series V500R007

This document is applicable to OceanStor 18500 V5, 18800 V5, 18500F V5, and 18800F V5. Based on the CLI, this document describes how to use various commands classified by functionsand how to set the CLI and manage the storage system through these commands.

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nmgr showinst

nmgr showinst


The nmgr showinst command is used to query the instance object details about a node manager in the system.


nmgr showinst -d index





index Index of node manager instances.

To obtain the value, run the "nmgr showallinst" command.


Diagnostic view

Usage Guidelines

This command can be used to query the details about the object memory such as the allocation queue when an error occurs in the node manager module.


Query the object details about node manager instance 0 in the system.

admin:/diagnose>nmgr showinst -d 0
NodeInst                     : 0x1000000100000000
DiskSegId                    : 0x40000000
SegOff                       : 0x8000
Pool ID                      : 0
Segment type                 : 0
Volume ID                    : 0x1000000100000000
Node Size                    : 32(sector)
Default Reserve Num          : 64
Flags                        : 0
Active Tx ID                 : 0x5a71
Pending Tx ID                : 0x5a71
Pending Tx VolID             : 0x1000000100000000
Max Node Number              : 0x4093
Pending Max Node Number      : 0x4093
Used Node Number             : 0x30
Pending Used Node Number     : 0x30
Root Segment ID              : 0x40000005
Pend Root Seg ID             : 0x40000005
Root Alloc Seg ID            : 0x40000005
Pend Root Alloc Seg ID       : 0x40000005
Write Num                    : 34
Prealloc Seg Num             : 0
Pend prealloc Seg Num        : 0
Disk Segment ID              : 0x40000000
Disk Segment Offset          : 0x8000
Version                      : 2
Preallocated segment info    : 0
Nodequeue Node Info          : 15
Node Num                     : 15
Pending Node Num             : 15
Head                         : 31
Pending Head                 : 31
Tail                         : 46
Pending Tail                 : 46
Index Node
---------- --------------------
31         0x400000050024
32         0x400000050029
33         0x400000050027
34         0x400000050021
35         0x400000050020
36         0x400000050026
37         0x40000005001f
38         0x40000005002b
39         0x400000050023
40         0x40000005002c
41         0x400000050025
42         0x400000050015
43         0x400000050028
44         0x40000005002d
45         0x400000050011
Cowqueue Node Info           : 1
Node Num                     : 1
Pending Node Num             : 1
Head                         : 68
Pending Head                 : 68
Tail                         : 69
Pending Tail                 : 69
Index Node
---------- --------------------
68         0x40000005001e

System Response

The following table describes the parameter meanings.




Volume ID of the instance.


Instance address.


Instance offset address.

Pool ID

Storage pool ID.

Segment type

Address type.

Volume ID

Volume ID of the instance.

Node Size

Node size.

Default Reserve Num

Number of reserved nodes.



Active Tx ID

Task ID.

Pending Tx ID

Pending task ID.

Pending Tx VolID

Pending task ID of the volume.

Max Node Number

Maximum number of nodes.

Pending Max Node Number

Maximum number of nodes when tasks are not delivered.

Used Node Number

Number of used nodes.

Pending Used Node Number

Maximum number of nodes used when tasks are not submitted.

Root Segment ID

Root segment ID.

Pend Root Seg ID

Root segment ID before the segment expansion task is submitted.

Root Alloc Seg ID

First segment ID in the allocation linked list.

Pend Root Alloc Seg ID

First segment ID in the allocation linked list before the task is submitted.

Write Num

Write sequence number of the instance.

Prealloc Seg Num

Number of preallocated segments.

Pend prealloc Seg Num

Number of preallocated segments before the task is submitted.

Disk Segment ID

Position of the node management object on the disk.

Disk Segment Offset

Segment offset.


Version of instance.

Preallocated segment info

Information of preallocated segments.

Nodequeue Node Info

Number of available allocation nodes.

Cowedqueue Node Info

Number of released cowed nodes saved in the task.

Node Num

Number of active nodes.

Pending Node Num

Number of pending nodes.


Head of the active queue.

Pending Head

Head of the pending queue.


Tail of the active queue.

Pending Tail

Tail of the pending queue.


Index of the node in the queue.


Address of the node in the queue.

Updated: 2020-01-17

Document ID: EDOC1000181602

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