3HAC029818-001 DSQC663

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3HAC029818-001 DSQC663

?塊是存儲(chǔ)的基礎(chǔ)架構(gòu)，對(duì)塊的管理是簡(jiǎn)單的。從全球第一個(gè)磁盤存儲(chǔ)技術(shù)50年前誕生到現(xiàn)在，塊的技術(shù)沒有發(fā)生太大變化。磁盤工業(yè)生產(chǎn)遍及全球。最近幾年，存儲(chǔ)行業(yè)興起存儲(chǔ)虛擬化和數(shù)據(jù)整合的新概念，在這些概念和方案中，數(shù)據(jù)還是以塊的形式通過網(wǎng)絡(luò)進(jìn)行讀寫操作。

? ? 塊形式的存儲(chǔ)在滿足數(shù)據(jù)可擴(kuò)展性和數(shù)據(jù)安全性的增長方面，日益顯現(xiàn)出其局限性和不足。國際上主要有兩類網(wǎng)絡(luò)化存儲(chǔ)架構(gòu)，它們是通過命令集來區(qū)分的。
? ? 第一類是SAN(StorageAreaNetwork)結(jié)構(gòu)，它采用SCSI塊I/O的命令集，通過在磁盤或FC(FiberChannel)級(jí)的數(shù)據(jù)訪問提供高性能的隨機(jī)I/O和數(shù)據(jù)吞吐率，它具有高帶寬、低延遲的優(yōu)勢(shì)，在高性能計(jì)算中占有一席之地，但是由于SAN系統(tǒng)的價(jià)格較高，且可擴(kuò)展性較差，已不能滿足成千上萬個(gè)CPU規(guī)模的系統(tǒng)。第二類是NAS(NetworkAttachedStorage)結(jié)構(gòu)，它采用NFS或CIFS命令集訪問數(shù)據(jù)，以文件為傳輸協(xié)議，通過TCP/IP實(shí)現(xiàn)網(wǎng)絡(luò)化存儲(chǔ)，可擴(kuò)展性好、價(jià)格便宜、用戶易管理，如目前在集群計(jì)算中應(yīng)用較多的NFS文件系統(tǒng)，但由于NAS的協(xié)議開銷高、帶寬低、延遲大，不利于在高性能集群中應(yīng)用。
? ? 針對(duì)Linux集群對(duì)存儲(chǔ)系統(tǒng)高性能和數(shù)據(jù)共享的需求，國際上已開始研究全新的存儲(chǔ)架構(gòu)和新型文件系統(tǒng)，希望能有效結(jié)合SAN和NAS系統(tǒng)的優(yōu)點(diǎn)，支持直接訪問磁盤以提高性能，通過共享的文件和元數(shù)據(jù)以簡(jiǎn)化管理，目前對(duì)象存儲(chǔ)系統(tǒng)已成為Linux集群系統(tǒng)高性能存儲(chǔ)系統(tǒng)的研究熱點(diǎn)，如Panasas公司的ObjectbaseStorageClusterSystem系統(tǒng)和ClusterFileSystems公司的Lustre等。

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Netapp SATA Disk Shelf DS14MK2 AT w14x 750GB X268A-R5

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NetApp DS14MK2-AT 10.5TB 14 X 268A-R5 750GB SATA Drives
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NetApp FAS3020 / FAS3050 – FAS3040 / FAS3070 Spares Kit

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(2) NetApp DS14MK2-AT 14.0TB w/14 X267A-R5 500GB SATA

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NetApp C1105B NetCache

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We buy your NetApp, EMC, IBM, SUN surplus.

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Network Appliance NETAPP DS14MK4 W/14 X 144GB 15K HD,
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NetApp X306A-R5 X306A R5 2TB 7.2K RPM 3Gb SATA HDD
2 year warranty – we buy and sell networking equipment

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Netapp X290A-R5 600GB 15K SAS Hard Drive

NetApp X292A-R5 600GB FC 15K RPM Hard Disk Drive

NetApp X550 DS14mk2 FC-AL Disk Shelf Base 2 PS NEW

Lot 5pcs Netapp X269A-R5 SP-269A-R5 108-00180 1TB SATA
$740 each!! 1 Year Warranty!! Full Shelves available!!!
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NetApp X411A-R5 450GB 15K SAS HD for DS4243 Disk Shelf

NetApp SK-F820B Spares Kit for F820 Filer

Lot 10 NetApp X268A-R5 SP-268A-R5 750GB SATA 108-00149
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NetApp DS14 mk2 with 14x 300Gb 10K +ESH

NetApp DS14MK2-AT 14x500GB Network Storage 7TB
Includes 1-Year Warranty+Emerg?entSX Value Added Service

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NetApp FAS270c FAS270-270C Head2 R5 Dual Controllers

NetApp FAS270c Filer No Disk Dual Controllers FAS270

NetApp DS14MK2 14 X 300GB 10K FC X276A-R5
We buy your NetApp, EMC, IBM, SUN surplus.

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We buy your NetApp, EMC, IBM, SUN surplus.

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We buy your NetApp, EMC, IBM, SUN surplus.

NetApp X3945-R5 Motherboard No Memory FAS3020 ,R5 New

NetApp FAS2050 Controller NetApp X3248A 111-00238

NetApp FAS2050 Controller NetApp X3248A-R5

NetApp FAS3050 Filer – Ontap licenses also available

NetApp 14 x 144GB 15K rpm MK2 disk shelf, X278A disks

NetApp FAS3050 Filer Head

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NetApp SK-F740B F740 Spares Kit – NEW Network Appliance

NetApp F760 Cluster (F760c) w/ (2) FC9 7 x 36GB
5 Year Next Business Day Warranty on All NetApp

NetApp X3146A-R5 NVRAM Card

NetApp 114-00014 Hot-Swap 650 Watt DC Power Supply

NetApp X500 14x36GB 10K DS14 Shelf Network Appliance

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NetApp FAS3020c Network Appliance Filer Head 2.8GHz

NetApp X500 DS14 FC-AL Disk Shelf Base with (2) PS

NetApp X550 DS14mk2 FC-AL Disk Shelf Base 2 PS

NETAPP FAS3020 Filer Head 2x DC Power Supply FAS 3020 *
1 Year Warranty! Ask about Disk Shelves! WE BUY SURPLUS

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5 Year Next Business Day Warranty on All NetApp

NetApp F810 Filer Head Unit

NetApp 14 x 300gb DS14 MK2 Shelf – X276, X276A disks

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Qty 20 NETAPP 300GB 10K X276A FC for DS14MK2 DS14MK4
$160 per drive!!! 1 Year Warranty!!! Full shelves avail
One-day shipping available

Qty 1 NetApp DS14MK2-AT DSX-7.0TB-R5-C 500GB SATA 7TB
Includes 1-Year Warranty

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NetApp X1131A-R6 HBA 2-Port 8Gb PCIe FCP Target Card

NetApp X410A-R5 300GB 15k R5 SAS Hard Drive

NetApp X268A-R5 750GB 7200 Disk for DS14 MK2 AT – NEW

NetApp X289A-R5 450GB 15k SAS Internal Hard Drive

NetApp 2TB DS14 mk2 w/ 14 X275 A 144GB 15K RPM HDD ESH2

NetApp FAS250 Network Appliance Filer W/ 2TB 14 x X274
We buy your NetApp, EMC, IBM, SUN surplus.

NETAPP DS14MK4 W/14 X 144GB 15K HD (x278a)
16 SHELVES AVAILABLE

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NetApp DS14mk2 AT Shelf w/ X267A-R5 X267A-R5 500GB SATA
90 day warranty

NetApp V-Series V3020c Filers 4 X 2GB FC

NetApp DS14MK4 with 14 X278A 15K 144GB drives.
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp (14) X278A 15K 144GB DS14MK4
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp 14 X278A 15K 144GB DS14MK4
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp Hard drives 14 X278A 15K 144GB DS14MK4
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp FAS980 Filer Head Network Appliance FAS 980
1 Year Warranty! Ask about Disk Shelves! WE BUY SURPLUS

NetApp FAS980 Filer Head Network Appliance FAS 980

NetApp X700B-ESH2-R5-C DS14MK2 SHLF ACPS 14x144GB

NetApp FAS980 Network Storage Filer Head 2x 2.7Ghz/6GB

NetApp X700AC DS14MK2 W/AC/PSU 14x144GB HD

NetApp FAS3020c iSCSI Filer Header

NetApp Network Appliance FAS960c Filer Unit System

NetApp SK-F810 Spares Kit for F810 Filer

NetApp X2044B FC-AL Card Dual Port Optical (SP-2044B)

NetApp X2044A FC-AL Card Dual Port Op (SC) (SP-2044A)

NetApp X2045A FC-AL Card Dual Port Optical (SP-2045A)

NetApp X2045B FC-AL Card Dual Port Optical (SP-2045B)

NetApp X3760B F760 Motherboard – NEW

NetApp FAS920 / FAS940 / FAS960 / FAS980 Filer Kit

NetApp X291A-R5 450GB FC Fibre Channel 15K Hard Drive

NetApp X289A-R5 450GB 15k SAS Internal Hard Drive

NetApp X3140A NVRAM IV Card w/ 256MB SP-3140A – NEW

NetApp X1922A FC VI Cluster Card Optical SP-1922A – NEW

NetApp X1925A Infiniband Cluster Adapter SP-1925A – NEW

NetApp X2040B QLA2200G FC-AL Fiber Channel HBA SP-2040B
One-day shipping available

NETAPP DS14 MK2 AT 14 X 500GB SATA TO FC (2) AT-FCX

NetApp DS14MK2 14 X 300GB 10K FC 2 X ESH2 1 YEAR WAR

NetApp X1125D Gigabit Ethernet Controller (SP-1125D)

NetApp X279A-R5 300GB 15K RPM Disk for DS14 MK2 – NEW

NetApp F880 X3135 NVRAM III 128MB Cache Card 110-02087
One-day shipping available

NETAPP FAS3050 Filer Head Supports DS14 MK2 MK2-AT MK4
$$$$$ WE BUY BACK YOUR SURPLUS / RETIRED EQUIPMENT $$$$

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NETAPP FAS3050 Filer Head Network Appliance FAS 3050

NetApp DS14MK2 14 X 300GB 10K FC 2 X ESH2 X276A

NetApp R200 NearStore Head Unit 6GB 2X2.4GHz XEON

NetApp FAS3020 Filer with DK14MK2 (14 X 500 GB HDD)

NetApp X3129 NVRAM III Card 64MB for F85 SP-3129

NetApp C1100A NetCache C1100 1 x 9GB – NEW

NetApp X680DC FC9 FC-AL Disk Shelf

NetApp X748A DC Power Supply

Netapp Filer FAS3020 1 Yr Warranty Network Appliance

Netapp FAS3020 Filer Head 1 YEAR WARRANTY
We Buy your Surplus NETAPP, SUN, DELL, HP, CISCO, IBM.

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NETAPP FAS3020 Filer Head Network Appliance FAS 3020
1 Year Warranty! Ask about Disk Shelves! WE BUY SURPLUS

NetApp DS14mk2 AT Shelf w/ X267A-R5 500GB SATA
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp F820 Filer Head Unit
5 Year Next Business Day Warranty on All NetApp

NetApp F85 Filer Network Appliance
5 Year Next Business Day Warranty on All NetApp

NetApp DS14MK4 Disk Shelf w/ 14x 144GB 15K FC X278A qty

NetApp DS14mk2 AT Shelf 14 x X267A-R5 500GB SATA Drives
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp (14) X267A-R5 500GB SATA DS14mk2 AT Shelf
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp DS14mk2 (14) X267A-R5 500GB SATA AT

專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊

PLC模塊，可編程控制器，CPU模塊，IO模塊，AI模塊，通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅

15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實(shí)力庫存商家


選擇深圳長欣，選擇放心，售后無憂大量現(xiàn)貨，當(dāng)天順豐發(fā)貨！
主營：本特利，英維思，伍德沃德，福克斯波羅、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

先介紹幾點(diǎn)經(jīng)驗(yàn)。
1、先通讀一遍“系統(tǒng)手冊(cè)”（不管能不能看懂，先了解個(gè)大概，以便學(xué)習(xí)編程時(shí)查找）；
2、由位控邏輯入手，逐漸增加定時(shí)、計(jì)數(shù)等條件，把或、與、非關(guān)系理順；
3、進(jìn)而練習(xí)整數(shù)運(yùn)算、實(shí)數(shù)運(yùn)算、類型轉(zhuǎn)換；
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解（最好是有個(gè)物理回路驗(yàn)證，比如變頻器+電機(jī)+測(cè)速傳感器）；
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制（盡量避免跳轉(zhuǎn)，非跳不可時(shí)也是跳的越近越好）；
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機(jī)器人配件DSQC系列和Motorola MVME系列，GE 卡件 模塊 驅(qū)動(dòng)器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌，由于PLC的基本框架大同小異，學(xué)會(huì)一種至于其它的學(xué)習(xí)起來也就簡(jiǎn)單了。

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