Journal-guided resynchronization for software RAID

被引：0
|
作者：
Denehy, TE [1 ]
Arpaci-Dusseau, AC [1 ]
Arpaci-Dusseau, RH [1 ]
机构：
[1] Univ Wisconsin, Dept Comp Sci, Madison, WI 53706 USA
来源：
USENIX ASSOCIATION PROCEEDINGS OF THE 4TH USENIX CONFERENCE ON FILE AND STORAGE TECHNOLOGIES | 2005年
关键词：
D O I：
暂无
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
We investigate the problem of slow, scan-based, software RAID resynchronization that restores consistency after a system crash. Instead of augmenting the RAID layer to quicken the process, we leverage the functionality present in a journaling file system. We analyze Linux ext3 and introduce a new mode of operation, declared mode, that guarantees to provide a record of all outstanding writes in case of a crash. To utilize this information, we augment the software RAID interface with a verify read request, which repairs the redundant information for a block. The combination of these features allows us to provide fast, joumal-guided resynchronization. We evaluate the effect of journal-guided resynchronization and find that it provides improved software RAID reliability and availability after a crash, while suffering little performance loss during normal operation.
引用
收藏
页码：87 / 100
页数：14
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