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兼济天下则达 独善其身则穷Linux kernel & Storage & Virtualization
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兼济天下则达 独善其身则穷 | wufei.org Reviews
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Linux kernel & Storage & Virtualization
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Slow fsync
http://wufei.org/2016/09/03/slow-fsync
Sep 3, 2016 JamesW. 转载须注明出处 www.wufei.org. Fsync对于Data Integrity的重要性不言而喻, 在我们的系统中fsync主要来源于两个地方:. Syslogd, 每条log之后都会调用fsync, 如果记录的log过多的话, 对fsync的性能有很高要求. 当然每条log之后都fsync是可以讨论的, 一个更直接的方法就是减少syslog的数量, 这个基本上是可以做到的. SQLite, 我们使用SQLite保存registry, registry里面不只是一些静态的configs, 也包括一些runtime的状态, 有些SQLite的访问甚至出现在data path上. 如果这些SQLite操作不能在规定时间完成, 我们会主动关闭业务逻辑, 所以SQLite的访问, 特别是写访问的速度对于我们至关重要. SQLite的写操作可想而知需要调用fsync, 当大量的fsync出现在系统中时, 对I/O的性能就是很大的挑战. 在继续讨论之前, 先来看看简化过的I/O stack:. 在我的博客 Linux Filesystem Primer. EXT4通过...
Crash Howto
http://wufei.org/2016/04/01/crash
Apr 1, 2016 JamesW. 转载须注明出处 www.wufei.org. Crash struct vm area struct -o struct vm area struct { [0] struct mm struct *vm mm; [4] long unsigned int vm start; . [44] long unsigned int vm offset; [48] struct file *vm file; [52] long unsigned int vm pte; } SIZE: 56 crash task struct -o ffff8100145d2080 struct task struct { [ffff8100145d2080] volatile long int state; [ffff8100145d2088] struct thread info *thread info; [ffff8100145d2090] atomic t usage; . Struct task group { . struct cfs rq * cfs rq; }; ...
Dedupe in Backup
http://wufei.org/2016/02/19/dedupe-in-backup
Feb 19, 2016 JamesW. 转载须注明出处 www.wufei.org. Post-process vs. Inline. WD) Arkeia Progressive Dedupe. ExaGrid Zone Level Dedupe. 通过识别数据中相同的部分, 并只保留其中的一份拷贝, 这个过程就是去重(Dedupe). 往往 Dedupe和压缩一起使用, 而且都能起到减少数据长度从而提高磁盘利用率, 这是两种不一样的技术. 自从Data Domain把Dedupe技术在Backup领域发扬光大之后, Dedupe就成为了Backup领域的标配. 通常Backup的数据都有大量的重复, 所有Backup解决方案都必须包括这样那样的Dedupe, 而且 现在越来越多的Primary Storage也都引入了Dedupe的功能. Backup的过程其实就是把数据从Source端搬到Target端. 比如你的笔记上安装一个Avamer Client, Backup的时候这个Client就会把硬盘上的文件复制到Avamer的后端. Post-process vs. Inline. Post-...
RAID, RAID, RAID
http://wufei.org/2016/05/08/raid
RAID, RAID, RAID. May 8, 2016 JamesW. 转载须注明出处 www.wufei.org. RAID 4 vs. RAID 5. RAID 10 vs RAID 01. Rebuild Time and MTTDL. Copy on Partial-Fail Drive. Optimization in Diagonal Parity. Differential RAID or Not. RAID 以 Stripe 为单位对数据提供保护, Stripe 又划分成 Stripe Unit 分布到所有的成员硬盘中, 往往一个 Stripe 会包含多份数据以及校验和. 在基本的 RAID 实现里, 通过一个简单的映射把 RAID 虚拟出来的逻辑磁盘地址对应到相应的物理硬盘和 LBA 上, 以下图为例, D1, D2 到 Dn 形成一个连续的地址空间. 在复杂的 RAID 实现里, 特别是一些实现压缩, 去重的商用系统, RAID 内部会维护一个虚拟磁盘地址到物理磁盘的映射, 这种简单的映射关系不复存在. SNIA 标准化了 0-6 共 7 个级别的 RAID. RAID 6: b...
scatterlist in xen-blkfront
http://wufei.org/2016/08/21/scatterlist-in-xen-blkfront
Aug 21, 2016 JamesW. 转载须注明出处 www.wufei.org. Persistent grants in xvd. Persistent grants in xvd. 由于我们用的内核版本是v3.2, 需要backport这个patch. 顺便说一下, v3.2真的不是Xen ready, 还缺少很多feature和bugfix, 不过对于开发人员来说却不见得是什么坏事, 刚好可以更深入的理解这些东西. Bash-3.00# parted /dev/xvdb mklabel gpt -bash-3.00# parted /dev/xvdb p Error: Can't have the end before the start! 跟踪parted的源码的话, 可以发现该错误是由于解析GPT的分区表时出错. 可以肯定的是, 除了使用parted之外, 我们并没有故意地去破坏分区表. 而且经过一番测试, 还可以确定的是, 这个bug就是backport persistent grants引入的. LBA 0 - Protective MBR, 0x55aa. Bash-3.0...
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兼济天下则达 独善其身则穷
Backup Brain to Brains. Linux I/O data flow. Sep 16, 2016. Sep 10, 2016. Plugging for 2x RAID sequential throughput. Sep 4, 2016. Sep 3, 2016. Aug 21, 2016. Slow memory access on Xen guest. Aug 19, 2016. Jul 3, 2016. Jun 26, 2016. Jun 13, 2016. RAID, RAID, RAID. May 8, 2016. Apr 2, 2016. Apr 1, 2016. Feb 24, 2016. Feb 19, 2016. Linux I/O data flow. Sep 16, 2016. Plugging for 2x RAID sequential throughput. Sep 4, 2016. Sep 3, 2016. Jun 13, 2016. RAID, RAID, RAID. May 8, 2016. Feb 19, 2016. Jun 26, 2016.
Blog de wufei - Oppai-chan en force XD - Skyrock.com
Mot de passe :. J'ai oublié mon mot de passe. Oppai-chan en force XD. Deux trois mots pour dire d avoir du texte par ici :-p. Mise à jour :. Abonne-toi à mon blog! Pour mon premier article je vais mettre un souvenir recent c etait le 30 mars dernier a l animansion *qui pour dire au passage etait trop cool *. Bon dans l ordre :. En haut a gauche anais *pour pas dire vegetalis * apres mwa *Oppai-chan* et puis senpai. Ou poster avec :. Posté le mercredi 02 avril 2008 08:06. N'oublie pas que les propos injur...
日本人の皆さま、タオバオに出店しませんか？
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