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"Lazy Size On MDS".pdf

LUG2018-Lazy_Size_on_MDS-Xi.pdf

🔗 Source: wiki.lustre.org

📊 Size: 238 KB

👤 Author: Molly Rector

⬇️ Downloads: 68

Summary

DataDirect Networks discusses Lazy Size on MDS, an approach to improve performance by storing file metadata, including size and blocks information, on the MDS (Metadata Server) instead of retrieving it from OSTs (Object Storage Targets). The current approach requires N+1 RPCs (Remote Procedure Calls) to get file attributes, resulting in slow "ls -l" commands on large directories. The proposed LSOM (Lazy Size on MDS) design saves size and blocks information as an EA (Extended Attribute) value on MDT (Metadata Target) and updates it when a file is truncated or closed. The implementation is kept simple, with no guarantee of LSOM accuracy, and a helper tool syncs file LSOM xattr periodically. Client support is provided through commands like "lfs getsom" and "getxattr"/"lgetxattr"/"fgetxattr" to retrieve LSOM xattr from MDT.

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Description

DataDirect Networks discusses Lazy Size on MDS, an approach to improve performance by storing file metadata, including size and blocks information, on the MDS...

Technical Information

File Format: PDF
File Size: 238 KB
Pages: 10
Language: EN
Author: Molly Rector
Total Downloads: 68
Last Updated: 1 month ago

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This PDF document about "Lazy Size on MDS" provides comprehensive information and guidance. Whether you're a beginner or advanced user, this resource offers valuable insights into "Lazy Size on MDS".