高負荷システムでNVMeデバイス使用時のfstrimとdiscard mount optionの話 - たごもりすメモ
先にまとめると ディスクI/Oに高い負荷をかけるシステムでNVMeデバイスを使うときweekly cron jobでfstrimが走る状況になってたら停止しろ じゃないとfstrimが走った瞬間にI/Oパフォーマンスが刺さって死ぬ fstrimを停止するならdiscard mount optionを有効化しろ、ただしその状態でのI/O性能で問題ないかどうか測っておけ discard mount optionを有効化しても大きいファイルの削除には気をつけろ、プチfstrimみたいになるぞ 追記されるばかりで大きくなるファイル(そして削除されるファイル)はNVMeじゃないデバイスに置いとけ 高I/Oスループットを期待するシステムでのNVMeとfstrim 社内で小さめのインスタンスを多く並べてトラフィックを捌いてたのを色々要件があって大きめのインスタンスにまとめるようなシステムアップデートをや
ATA Secure Erase - ata Wiki
OBSOLETE CONTENTThis wiki has been archived and the content is no longer updated. This procedure describes how to use the hdparm command to issue a Secure Erase ATA instruction to a target storage device. When a Secure Erase is issued against a SSD drive all its cells will be marked as empty, restoring it to factory default write performance. DISCLAIMER: This will erase all your data, and will not
Flash Reliability in Production: The Expected and the Unexpected | USENIX
As solid state drives based on flash technology are becoming a staple for persistent data storage in data centers, it is important to understand their reliability characteristics. While there is a large body of work based on experiments with individual flash chips in a controlled lab environment under synthetic workloads, there is a dearth of information on their behavior in the field. This paper
Facebook's SSD findings: Failure, fatigue and the data center
Facebook's SSD findings: Failure, fatigue and the data center SSDs revolutionized data storage, even though we know little about how well they work. Now researchers at Facebook and Carnegie-Mellon share millions of hours of SSD experience Millions of SSDs are bought every year. It's easy to be impressed by fast boots and app starts. But what about 24/7 data center operations? What are the common
When Solid State Drives are not that solid - Algolia Blog
It looked just like another page in the middle of the night. One of the servers of our search API stopped processing the indexing jobs for an unknown reason. Since we build systems in Algolia for high availability and resiliency, nothing bad was happening. The new API calls were correctly redirected to the rest of the healthy machines in the cluster and the only impact on the service was one woken
SSDs: A gift and a curse
TweetArtur Bergman, founder of a CDN exclusively powered by super fast SSDs, has made many compelling cases over the years to use them. He was definitely ahead of the curve here, but he’s right. Nowadays, they’re denser, 100x faster and as competitively priced as hard disks in most server configurations. At Etsy, we’ve been trying to get on this bandwagon for the last 5 years too. It’s got a lot b
Coding for SSDs – Part 1: Introduction and Table of Contents | Code Capsule
Hi, I’m Emmanuel! I’m the author of this blog. I am a Senior Director of Software Engineering at adidas.com, and I’m based in Amsterdam, Netherlands. Translations: This article was translated to Simplified Chinese by Xiong Duo and to Korean by Matt Lee (이 성욱). Introduction I want to make solid-state drives (SSDs) the optimal storage solution for my key-value store project. For that reason, I had t
SSD に関する雑感 - mura日記 (halfrack)
SSD は block erase やら wear leveling で作業領域としての DRAM に大きく頼らざるを得ない。 電源断により DRAM の dirty な領域が消失することを考慮しながらメタデータの破損を防ごうとすると、 DRAM -> NAND の書き込み順序に強い制約が生じ、高速化に支障を来す。(ファイルシステムにおけるそれと同じように) DRAM with BBU を仮定すると、ファームウェアが書き込みの順序をイジる自由度が大幅に増す。 HDD と違い、 NAND は短時間ならキャパシタの電力で書き込みを行うことが出来るので、 SSD 内部での DRAM with BBU が容易であり広く普及するだろう。 コンデンサは二次電池と違い、はめ殺しに出来る程度に寿命が長い。 定期的な交換を必要とせずメンテナンスが楽なので、コンシューマ向けにも普及するだろう。 安価な SSD
OpenSSDWiki
The OpenSSD Project is an initiative to promote research and education on the recent SSD (Solid State Drive) technology by providing easy access to OpenSSD platforms on which open source SSD firmware can be developed. Currently, we have offered an OpenSSD platform based on the commercially successful BarefootTM controller from Indilinx Co., Ltd. In addition, we now support an FPGA-based OpenSSD pl
Log-structured file systems: There's one in every SSD
Please consider subscribing to LWNSubscriptions are the lifeblood of LWN.net. If you appreciate this content and would like to see more of it, your subscription will help to ensure that LWN continues to thrive. Please visit this page to join up and keep LWN on the net. When you say "log-structured file system," most storage developers will immediately think of Ousterhout and Rosenblum's classic pa
SSDAlloc - Hybrid SSD/RAM Allocation Made Easy
Hybrid SSD/RAM Memory Management Made Easy. A Nearly-Transparent Programming Model for High-Performance Flash in Virtual Memory. What Is It? Flash memory (mostly in the form of SSDs) is fast becoming an integral part of a wide range of systems, including cell phones, netbooks, laptops, desktops and servers. The integration is happening either in the form of an SSD based swap space or SSD based
Investigation: Is Your SSD More Reliable Than A Hard Drive? : SSD Reliability: Is Your Data Really Safe?
Does a lack of moving parts translate to higher reliability? That's the assumption many enthusiasts and IT professionals make about SSDs. We go straight to the data centers using these devices, dig into failure rate statistics, and suggest otherwise. SSD Reliability: Is Your Data Really Safe?Back in 2008, Intel made a case to us about storage bottlenecking its Nehalem architecture. We were at IDF
SATA3.0対応SSDで,SATA3・SATA2ケーブルでの速度差はあるの？(2/9更新) | おもひでほろほろ
一定期間更新がないため広告を表示しています
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GitHub - KioxiaAmerica/trocksdb: RocksDB modified to separate keys and values, resulting in a major decrease in write amplification without sacrificing performance
Error Characterization, Mitigation, and Recovery in Flash Memory Based Solid-State Drives
Reduce Windows 10 size With Built-in App Called CompactOS - The Steps
Siglead
SSDの裏話をSSDコントローラメーカー「シグリード」に聞いてみた 2TB SSDのサンプルと450万円のNANDチェック機器を店頭デモ中 （○○なもの）
Linux SSD partition alignment tips | Into.the.Void.
Don’t waste your SSD blocks « An enjoyed kernel apprentice