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Manylogs: Improved CMR/SMR disk bandwidth and faster durability with scattered logs

机译：Manylogs：改进的CMR / SMR磁盘带宽并通过分散的日志提高耐用性

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We introduce manylogs, a simple and novel concept of logging that deploys many scattered logs on disk such that small random writes can be appended into any log near the current disk head position (e.g., the location of last large I/O). The benefit is two-fold: the small writes attain fast durability while the large I/Os still sustain large bandwidth. Manylogs also inspire a new principle: decoupling of durability and location constraints. For example, we can put journal blocks in any scattered log as they only need durability but not location constraints (i.e., eventually journal blocks will be freed). We can also allow applications to specify which files that require only durability but not location constraints (e.g., application commit-log files). We show the power of manylogs for Conventional-Magnetic Recording file system (MLFS) and block-level (MLB) layers and also Shingled-Magnetic Recording (MLSMR) layer. With microand macro-benchmarks, compared to Linux ext3, MLFS provides up to 15x (3.7x on average) bandwidth improvement and up to 22x (5.7x) faster sync latency. With real-world traces, MLB and MLSMR deliver 1.9x and 1.3x I/O latency speed-up on average respectively.
机译：我们介绍了manylogs，这是一种简单而新颖的日志记录概念，它在磁盘上部署了许多分散的日志，因此可以将小的随机写操作追加到当前磁盘磁头位置附近的任何日志中（例如最后一个大I / O的位置）。好处有两个：较小的写入可实现快速的持久性，而较大的I / O仍可保持较大的带宽。 Manylogs还激发了一个新原理：将耐用性和位置约束脱钩。例如，我们可以将日志块放在任何分散的日志中，因为它们仅需要持久性，而无需位置限制（即最终将释放日志块）。我们还可以允许应用程序指定哪些文件仅需要持久性，而无需位置限制（例如，应用程序提交日志文件）。我们展示了常规磁记录文件系统（MLFS）和块级（MLB）层以及叠磁记录（MLSMR）层的许多日志的功能。与Linux ext3相比，MLFS具有微基准和宏基准，可提供高达15倍（平均3.7倍）的带宽改进，以及高达22倍（5.7倍）的同步延迟。通过实际跟踪，MLB和MLSMR分别平均提供了1.9倍和1.3倍的I / O延迟加速。

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