In his post on dtrace.org Adam Leventhal summarizes the 10th anniversary celebration of the creation of ZFS. The post includes three videos on the subject, the first of which is with Matt Ahrens, co-creator of ZFS, who discusses the new stable ZFS interface designed for programmatic consumers of the solution. John Kennedy explains his work on the ZFS test suite, and Chris Siden of Delphix discusses his work on ZFS feature flags and Async Destroy, which allows datasets to be destroyed asynchronously in the background, which is especially helpful when gigantic datasets need to be erased, Leventhal observes.
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RAID-Z -- the ZFS implementation of RAID -- was the subject of Adam Leventhal's presentation at the 2010 Open Storage Summit, a presentation he entitled "Everything You Always Wanted to Know About RAID-Z," and that he describes as " ... an accumulation of blog posts and articles written by me and others as well as quite a bit of new material that’s been building up." He also calls the talk an overview of RAID-Z's history, a review of its strengths and weaknesses, and a glance at the future challenges ZFS and RAID will have to meet, along with a few suggestions toward solutions and mitigating factors.
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By hiding the write latency of disks and thereby enabling the use of economical, high-capacity drives, Logzilla, a key component of the ZFS Hybrid Storage Pool, can accelerate synchronous writes, blogger Adam Leventhal observes, conceding at the same time the role played by the fast SAS and SATA SSDs from STEC in the Sun Storage 7000 series. He adds that using SAS-attached SSDs is a simpler and more reliable, though slower, clustering solution than the traditional PCI-attached DRAM device, however.
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As the title of his blog, "Fishworks history of SSDs," suggests, Adam Leventhal parts the curtain on some of the deliberations behind bringing the 7000-series enterprise storage solution to fruition. Finding it difficult to realize the desired storage capacity using 7,200 rpm disks, Fishworks turned to the new technology of flash storage. The first solution employing flash was Logzilla, he writes.
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RAID-Z was designed as a software substitute for the expensive RAID card that has been used in traditional storage and, using its variable width stripes, to overcome the "RAID-5 write hole," writes Fishworks engineer Adam Leventhal in his blog "What is RAID-Z?" For all of that, however, Leventhal suggests that RAID-Z is not the mirror image of RAID-5.
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