Raid Controller
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 Dell Perc 5 SAS RAID Controller PCI E PY331  US $65.00
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 Dell PowerEdge RP272 Raid Controller US $60.99
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 3ware 8506 12 Escalade 12 Port SATA RAID Controller PCI Card 64 Bit US $59.99
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 IBM 25R8064 IBM IBM ServeRAID 8k SAS Storage controller zero channel RAID US $59.00
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 FlashPoint LT SCSI PCI I O Raid controller US $29.95
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 HP Compaq 204069 001 Fiber RAID Array Controller US $24.99
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RAID And Other Computing Advancements - There May Be All The Time Fragmentation
A latest article by Computing Technology Overview's Tom Joyce discusses the truth that with every major advancement in enterprise computing comes new set of efficiency administration challenges. This was and is certainly true of RAID technologyeven although rumors have circulated in some circles for years that RAID is a performance resolution and would not need defragmentation, analysis as well as person testimony has actually shown otherwise.
RAID (which initially meant Redundant Array of Inexpensive Disks and now means Redundant Array of Unbiased Disks) makes use of any of a number of technologies to create a digital quantity which, actually, is made up of quite a few disks. Data written to the RAID set is written redundantly so that if one of many disks ought to fail, the entire data is still available, many instances with no seen interference to the user. This implies drastically lowered or no downtime for very important purposes corresponding to databases. The working system "sees" the RAID set as one volume; knowledge is written bodily to the disks by the RAID controller which also create a replica of each information block.
RAID technologies additionally serve to improve efficiency; because the I/O load is throughout a number of disks instead of just one, retrieval is faster. But the fantasy that fragmentation does not have an effect on RAID arrays is truly that: a myth. As an utility reads and writes to this virtual setting (creating new information, extending present ones, in addition to deleting others) the files develop into fragmented. Because of this reality, fragmentation on this logical drive will have a substantial destructive efficiency effect. When an I/O request is processed by the file system, there are a variety of attributes that should be checked which cost worthwhile system time. If an application has to problem multiple "unnecessary" I/O requests, as in the case of fragmentation, not solely is the processor stored busier than needed, however once the I/O request has been issued, the RAID {hardware}/software must process it and decide to which physical member to direct the I/O request.
A defragmenter sees the RAID surroundings simply because the file system does. That's, it defragments the logical drive, bettering the velocity and performance of a RAID setting by eliminating wasteful and pointless I/Os from being issued by the file system. This happens as a result of the file system sees the files and free house as being more contiguous. The file system will spend much less time checking file attributes which suggests more processor time could be dedicated to doing real useful work for the consumer and application.
With immediately's monumental disk capacities and file sizes, mixed with increased-than-ever access demand on RAID sets by servers, consideration must also be paid not solely to the very fact of defragmentation, however the defragmentation know-how itself. Scheduled defragmentation, as soon as "state-of-the-art", is now leaving fragmentation behind after defragmenter runs. The true resolution in high-demand server environments is a new breed of defragmenter which requires no scheduling but runs invisibly within the background, at any time when system resources are available, and keeps tempo with at this time's frantic fragmentation rates.
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Solving “Event 129 nvstor64 reset to device, DeviceRaidPortN was issued” and “Event 5 nvstor63 A parity error was detected on DeviceRaidPortN” (TheNubbyAdmin)
My Problem: I have an HP ML 115 G5 server that uses a NVIDIA NFP3400 Chipset
for storage. I have two pairs of hard drives that are mirrored. The Windows
Server 2008 event log was displaying the following errors reported by the
nvstor64 driver: Event 129 nvstor64 "reset to device, DeviceRaidPort2 was
issued" Event 5 [...]
Adaptec 5445 SATA SAS RAID Controller & MaxIQ SSD Cache Unboxing & First Look Linus Tech Tips
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