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Storage has changed dramatically over the last three years driven by SSD developments. Most of the key components necessary for a powerful storage system are available and the cost is highly favorable for direct placement of data files. Some additional Read More...
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Over the last two years, I have stood up several proof-of-concept (POC) database server systems with consumer grade SSD storage at cost $2-4K per TB. Of course production servers are on enterprise class SSD, Fusion-IO and others, typically $25K+ per TB. Read More...
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After years of anticipation and false starts, the SSD is finally ready to take a feature role in database server storage. There were false starts because NAND flash is very different from hard disks and cannot be simply dropped into a storage device and Read More...
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I am finally getting around to setting up a SSD array, starting with a few, then working up to perhaps 20 units over 2 controllers and 4 x4 SAS ports. During initial testing I observed very high disk latency, in the range of 100ms+ for reads and upto Read More...
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Over weekend I was looking at various RAID controller documents to update my material on storage performance, and I came across three items that were good for a hoot. Direct IO, not Cached IO The LSI slidedeck MegaRAID Performance Tuning and Benchmark Read More...
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Revenge, Return of Big Iron. In the old days, standard server systems did not have the power to run large enterprises, hence there were vendors that built really big servers. However it became apparent if not widely publicized that there were serious Read More...
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Storage performance is not inherently a complicated subject. The concepts are relatively simple. In fact, scaling storage performance is far easier compared with the difficulties encounters in scaling processor performance in NUMA systems. Storage performance Read More...
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First, especially for all the people with SAN storage, drive letters are of no consequence. What matters is the actual physical disk layout behind each RAID Group or LUN. Forget capacity, pay attention to the number of spindles supporting each RAID group. Read More...
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While reading through the documentation for the HP Storage Works 2000 MSA, I found the following performance numbers cited in the quickspecs for both the FC and SAS versions. The 2000fc version cited performance numbers for the fc (Fiber Channel), sa Read More...
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A recently published TPC-H benchmark result, along with previously published results provide some insight into to the relative impact of SSD to disk drives, and SSD versus system memory. The TPC-H configurations are shown below. All results are at SF Read More...
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For several months, we have seen ads for the joint HP/Oracle RAC and Exadata storage combination talking about extreme performance (10X faster) for large data warehouses. One thing I like about Oracle is that they have courage to pursue technology with Read More...
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This came out on the Microsoft website. I have not had time to look over the hardware configuration carefully. Of course the recommended storage is a SAN, vendors love to sell very high margin products when there are perfectly good merely high margin Read More...
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Last month, Scott pointed out the really bad performance characteristics of the Dell PERC6 in RAID0 sequential write, particularly compared with RAID-5. Granted, this is not necessarily a red flag because few people use RAID 0 in production. Still, if Read More...
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Everytime a good product comes out, people seem to contrive bad ideas for what can be replaced, usually brains, or people with brains, or that people lacking brains can accomplish something on their own. Let me put it simply. Suppose one had a query that Read More...
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An observant person has probably noticed that SQL queries requiring disk reads not only have longer duration but also higher CPU times. It is not hard then to deduce that disk access (for both HDD and SSD), which involves the OS performing an IO call, Read More...
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