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Advanced O&M Command Reference

OceanStor 2800 V3 V300R006

This document is applicable to OceanStor 2800 V3. 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. The document that you browse online matches the latest C version of the product. Click Download to download documents of other C versions.
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mcachelayer queryext

mcachelayer queryext


The mcachelayer queryext command is used to view extent information in metadata caches and space allocation.


mcachelayer queryext -p pool id -l lun id -e extent id -t volume type





pool id

Disk domain ID.

The value ranges from 0 to n minus one. n indicates the maximum number of disk domain.

lun id


The value ranges from 0 to n minus one. n indicates the maximum number of LUNs.

extent id

Extent ID.


volume type

Volume type.

The value can be 0 or nonzero number, where:

  • data

non-zero number: meta.


Diagnostic view

Usage Guidelines



View extent information in metadata caches and space allocation.

admin:/diagnose>mcachelayer queryext -p 0 -l 0 -e 0x40000001 -t 1 
Extent info in mcache: 
Query extent info in mcache failed.Begin query in spa. 
Extent info in spa: 
Extent ID : 0x40000001 
Ckg ID : 0x4000 
Ckg Offset : 1 
Init Flag : 1 (0:init not finished 1: init finished) 
Zone Index : 0 
Migrate Flag : 0 (0:not migrate 1:migrate)

System Response


Updated: 2019-07-12

Document ID: EDOC1000138381

Views: 753405

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