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首页> 外文期刊>Journal of information science and engineering >Backup Metadata As Data: DPC-ToIerance to Commodity File System
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Backup Metadata As Data: DPC-ToIerance to Commodity File System

机译：将元数据备份为数据：DPC到商品文件系统的容差

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Backup Metadata As Data (MAD) is a user-level solution that enables commodity file systems to replicate their critical metadata and to recover from disk pointer corruptions. More specifically, it extracts disk pointers from file system and saves them as user data. When some data blocks become inaccessible due to pointer corruptions, Backup MAD restores access paths to them either by copying the blocks to another file system or by directly updating on-disk structures of file system. The latter technique helps Backup MAD restore lost files faster than any other recovery solution because data blocks are not moved during restoration. Also, as the technique relies on disk pointers extracted from a consistent file system state, it can rescue up to 50% more files than a scan-based recovery tool that infers block dependencies from a corrupted partition. We demonstrate the effectiveness of our technique by two real implementations, MAD-NTFS and MAD-ext2. Backup MAD enhances dependability of file system by protecting disk pointers on behalf of file system.
机译：数据备份元数据（MAD）是一种用户级解决方案，使商品文件系统能够复制其关键元数据并从磁盘指针损坏中恢复。更具体地说，它从文件系统中提取磁盘指针并将其保存为用户数据。当某些数据块由于指针损坏而变得不可访问时，Backup MAD可以通过将数据块复制到另一个文件系统或直接更新文件系统的磁盘结构来恢复对其的访问路径。后一种技术比任何其他恢复解决方案都可以帮助Backup MAD恢复丢失的文件更快，因为在恢复过程中不会移动数据块。而且，由于该技术依赖于从一致文件系统状态中提取的磁盘指针，因此与基于扫描的恢复工具（可从损坏的分区推断出块依赖关系）相比，它可以挽救多达50％的文件。我们通过两个真实的实现MAD-NTFS和MAD-ext2证明了我们技术的有效性。备份MAD通过保护代表文件系统的磁盘指针来增强文件系统的可靠性。

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