实习1
2016-07-12 10:54:40 0 举报
实习1是一段重要的学习和成长经历。在这个阶段,实习生将有机会亲身参与并了解所在公司的运作和业务流程。通过与同事合作、参与项目和接受指导,实习生可以提升自己的专业技能和职业素养。此外,实习1也是一个展示自己能力和潜力的机会,通过积极参与工作并展现出良好的工作态度和团队合作精神,实习生可以在公司中建立起良好的声誉和人脉关系。总之,实习1是一个宝贵的机会,可以为实习生的职业发展打下坚实的基础。
作者其他创作
大纲/内容
读/写入硬盘
1. Data write2. Journal metadata write3. Journal commit4. Checkpoint metadata5. Free
protocol
Data Journaling
PM
读/写入内存
SSD/HDD
Tricky Case
The File System Checker(fsck)
Batching Log Updates
Making The Log Finitecircular log(eg.mark theoldest and newest non-checkpointed transactions in the log in a journal superblock)
the log is of a finite size
Metadata Journaling
1. Journal write2. Journal commit3. Checkpoint
非易失数据
1. Journal write2. Checkpoint
Soft Updates copy-on-write (COW) backpointer-based consistency (or BBC)optimistic crash consistency
avoid excessive write traffic to disk
DRAM
读/写入PM
Block Reuse revoke record
too slow、 it is incredibly expensive to scan the entire disk to fix problems
cache
Journaling (or Write-Ahead Logging)
Other Approaches
avoid writing data twice
1. Journal write2. Journal commit3. Checkpoint4. Free
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