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Articles for the keywords: L2ARC
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18 Jul 2012
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Oracle ZFSSA Smashes IBM XIV Running Oracle ERP On Oracle RAC DB [26952]
Performance Gains Are Laid to CACHE Size
In a proof of concept exercise running a customer's Oracle ERP on Oracle T-4 servers and an Oracle RAC on T-4's, plus storage using an Oracle ZFS Storage Appliance 7420, Darius Zanganeh reports that, even without any optimization, the Oracle system was 2.5x faster than the customer's IBM XIV production system in running their month end close. Zanganeh suggests the reason is the size of available CACHE: 1TB of cache split on 2 controllers, 2 TB of L2arc Read SSDs and a few write SSDs. Furthermore, the Oracle configuration only used about 25% of the total hardware setup.
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30 Mar 2012
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ZFS Resources [25859]
Getting Started, Links and Videos
ZFS is a combined file system and logical volume manager designed by Sun more than 10 years ago. The features of ZFS include data integrity verification against data corruption modes, support for high storage capacities, integration of the concepts of filesystem and volume management, snapshots and copy-on-write clones, continuous integrity checking and automatic repair, RAID-Z and native NFSv4 ACLs. ZFS is implemented as open-source software, licensed under the Common Development and Distribution License (CDDL).
The illumos wiki page for ZFS has a useful set of links to documents and videos including on-going illumos ZFS projects.
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03 Aug 2011
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Determining the Costs of Using Dedup with ZFS [24414]
Blogger Takes a Case Study Approach
Whether -- or not -- to dedup is a question addressed by Constantin Gonzalez in a recent blog that subject the question to a cost/benefit analysis as a means of allaying the anxieties of those users who remain uneasy about the dedup capabilities of ZFS. Gonzalez blogs that, "the decision to use ZFS deduplication or not is almost always a simple cost/benefit analysis. When using deduplication, one needs to plan for at least some extra L2ARC SSD requirements, or better some extra RAM for storing the dedup table in a manner that doesn't negatively impact write performance. Especially RAM can become a decisive factor in deciding for or against deduplication, so usually a dedup savings factor of 2 is a necessary threshold for deduplication to become a real cost saver." He reviews the means in a case study approach to learn just how much space is saved in a dedup procedure; calculating the memory costs of using dedup; L2ARC as an alternative to dedup. Finally, Gonzalez lays out how to determine the break even point in assessing dedup costs and provides a couple rules of thumb.
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09 Jun 2011
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ZFS Features by Version [24249]
From ZFS Version 1 to Version 5, from iSCSI to Triple Parity RAID-Z
In his Oracle blog post on ZFS zpool and file system version numbers and features Steffen Weiberle points out that ZFS versions are conveniently backward compatible but that the reverse is not the case. It is therefore important, he writes, to know what the oldest kernel version is that one might with to attach a pool to, making sure that upgrades are not made that would render this impossible. He then provides a helpful table that lists the ZFS feaures introduced in Solaris 10 updates.
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