show ddp compress_info
Function
Format
show ddp compress_info domain_id=? extent_id=? extent_offset=? storage_tier=? gang_flag=? controller=?
Parameters
Parameter |
Description |
Value |
|---|---|---|
| domain_id=? | ID of the domain that you want to query. | To obtain the value, run the "show file_system general" or "show lun dedup_compress" command. |
| extent_id=? | ID of the extent that you want to query. | The value ranges from 0 to 18,446,744,073,709,551,615. |
| extent_offset=? | Offset of the extent that you want to query. | The value ranges from 0 to 4,294,967,295. |
| storage_tier=? | Type of the storage media. | The value can be "SSD", "SAS", or "NearLine SAS", where:
|
| gang_flag=? | Gang chunk flag. | The value can be "true" or "false", where:
|
| controller=? | Controller ID. | The value is in the format of "XA" or "XB" or "XC" or "XD", where the "X" is an integer ranging from 0 to 3, for example: "0A", "1C". |
Example
Query compression information about the data block with gang chunk flag "false" and storage media "SAS" on extent "72130162894987266" with offset "0" in domain "0".
developer:/>show ddp compress_info domain_id=0 extent_id=72130162894987266 extent_offset=0 storage_tier=SAS gang_flag=false controller=0A Is Compressed Data : Yes Tag : 3671775962 Original Data Checksum : 3671775962 Compressed Data Checksum : 651771316 Version : 16 Original Data Length : 65536 Compressed Data Length : 18908 Compress Algorithm : 0 Compress Header Length : 32 Block Number : 1 Private Length : 4 Original Data Checksum Flag : False Compressed Data Checksum Flag : True Block Length : 65536
System Response
The following table describes the parameter meanings.
Parameter |
Meaning |
|---|---|
| Is Compressed Data | Whether data is compressed. |
| Tag | Compression flag. |
| Original Data Checksum | Check value of original data. |
| Compressed Data Checksum | Check value of compressed data. |
| Version | Version of the compression algorithm library. |
| Original Data Length | Length of original data. |
| Compressed Data Length | Length of compressed data. |
| Compress Algorithm | Compression algorithm. |
| Compress Header Length | Length of the compression header. |
| Block Number | Number of blocks that are compressed together. |
| Private Length | Length of compressed private information. |
| Original Data Checksum Flag | Check flag of original data. |
| Compressed Data Checksum Flag | Check flag of compressed data. |
| Block Length | Length of the combined block. |
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