btrfs? Dropboxã•ã‚“, ã‚ãªãŸãŒè¦‹ã¦ã„ã‚‹ã®ã¯ext4ã§ã™ã‚ˆ - Gentoo metalog注æ„: ã“ã®è¨˜äº‹ã®å†…容ã¯ã‚ã‚Šã¨å±é™ºãªéƒ¨åˆ†ãŒã‚ã‚Šã¾ã™. 使ã„ãŸããªã£ã¦ã‚‚よã注æ„ã—ã¦ç†è§£ã—ã¦ä½¿ã£ã¦ãã ã•ã„ ã‚ãŸã—ã‚‚ã¾ã 大ã—ã¦å®Ÿå‹•ãƒ†ã‚¹ãƒˆã—ã¦ã¾ã›ã‚“. Dropboxã®ä¸èº«ãŒæ¶ˆå¤±ã—ãŸã‚Š, FSãŒã“ã‚ã‚ŒãŸã‚Š, ãªã‚“ã‹ãŠã‚‚ã—ã‚ã„ã“ã¨ã«ãªã£ã¦ã‚‚責任ã¯ä¸€åˆ‡ã¨ã‚Œã¾ã›ã‚“. 技術的ãªè¦³è³žç”¨ã«ç•™ã‚ã‚‹ã®ãŒç„¡é›£ã§ã™ ã¯ã˜ã‚ã« DropboxãŒext4ã—ã‹å¯¾å¿œã—ãªããªã‚‹ã‚‰ã—ã„ã§ã™ã. btrfs愛用者ã¨ã—ã¦ã¯ãƒãƒãƒ£ãƒ¡ãƒãƒ£ã‚ã‚“ã©ã„ã§ã™. ã¨ã„ã†ã“ã¨ã§, ãªã‚“ã¨ã‹ã—ãŸããªã‚Šã¾ã™ã. 1ã¤ã®æ–¹æ³•ã¨ã—ã¦, 下ã®è¨˜äº‹ã®ã‚ˆã†ã«btrfs上ã«ext4ã®ã‚¤ãƒ¡ãƒ¼ã‚¸ãƒ•ã‚¡ã‚¤ãƒ«ã‚’作ã£ã¦ã‚ã’ã‚‹ã¨ã„ã†æ–¹æ³•ãŒã‚ã‚Šã¾ã™. qiita.com ãŸã ã“ã®æ–¹æ³•ã ã¨, kernelã®ä¸ã§ç„¡é§„ã«ext4ã‚’Dropboxã®ãŸã‚ã ã‘ã«å‹•ã‹ã™ã“ã¨ã«ãªã‚Šã¾ã™ã. ext4ã®moduleãªã‚“ã‹ç½®ã„ã¦ãŠããŸããªã„. ãã†æ€ã„ã¾ã›ã‚“㋠システムコールã®çµæžœã‚’書ãã‹ãˆã‚‹
Using an external journal with ext4 – Jean's Blog
ext4ã®noauto_da_allocオプションã®è©³ç´° - Qiita
https://liw.fi/larch/ohad-btrees-shadowing-clones.pdf
https://www.semanticscholar.org/paper/Improving-block-sharing-in-the-Write-Anywhere-File-Grusecki/3d1abb7432c9e52758f1bccc5b1e2e60dfbfe91f?p2df
Write Anywhere File Layout - Wikipedia
Better Linux Disk Caching & Performance with vm.dirty_ratio
Ensuring data reaches disk [LWN.net]![Ensuring data reaches disk [LWN.net]](https://cdn-ak-scissors.b.st-hatena.com/image/square/6b330395eb6a3a4002d6aa19c1d6d71ad3930378/height=288;version=1;width=512/https%3A%2F%2Fstatic.lwn.net%2Fimages%2F2011%2Fjm-data-flow.png)
New community features for Google Chat and an update on Currents
Fsync Performance on Storage Devices
ãƒãƒƒãƒ•ã‚¡ã‚ャッシュã¨AIO（1）
Which I/O controller is the fairest of them all? [LWN.net]
https://www3.cs.stonybrook.edu/~bender/newpub/2012-EsmetBeFa-HotStorage.pdf
Comparison of file systems - Wikipedia
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