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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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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 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: 2020-01-17

Document ID: EDOC1000181602

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