1771-P5E

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描述

1771-P5E

在2004年，ANSI推出了基于對象的存儲設備(OSD)的1.0版本規(guī)范。它定義了基于對象的存儲設備的通訊協(xié)議。OSD規(guī)范描述了一個SCSI命令集合，由他提供一個高水平的OSD接口。這個接口允許客戶端，比如文件系統(tǒng)和數(shù)據(jù)庫存放和索引數(shù)據(jù)。SNIA’S技術(shù)工作組當前正在開發(fā)OSD規(guī)范的2.0版本，這個版本年內(nèi)完成。
? ? 一個OSD設備存放對象，他控制著從對象到物理介質(zhì)的映射圖。設備同時也跟蹤作為屬性的元數(shù)據(jù)，例如建立時間標記，從而允許在客戶端非常容易地共享數(shù)據(jù)。
? ? 可以說，OSD最大的賣點在于它結(jié)合了SAN的可擴展性和NAS的數(shù)據(jù)共享。早期的NAS架構(gòu)的擴展性能并不好，因為所有的元數(shù)據(jù)的處理都集中在NAS服務器上。在有限的NAS頭下擴張更多的存儲受到限制，而且這個時候，NAS上的元數(shù)據(jù)處理變成了瓶頸。如果想擴展，就需要增加更多的NAS服務器，但是此時的管理成為頭疼的事情，因為數(shù)據(jù)是分散的，這就是我們常說到的“NAS　孤島”
? ? OSD的能力在于它將客戶端和OSD設備直接聯(lián)系起來，并不需要中間環(huán)節(jié)管理元數(shù)據(jù)。Panasas公司，全球第一家提供商用OSD產(chǎn)品的公司，同時提供面向?qū)ο蟮拇鎯筒⑿形募到y(tǒng)。Panasas公司的DirectFLOW的設計，客戶端從帶外管理的控制刀片得到目標的分布和安全屬性。所有的數(shù)據(jù)流都直接從OSD存儲刀片到客戶端。盡管商用的OSD產(chǎn)品還只是鳳毛麟角，但是OSD技術(shù)還是在日新月異?！∥鹘莺虸BM已經(jīng)展示了OSDc產(chǎn)品?！P已經(jīng)和開放源代碼廠家　Lustre文件系統(tǒng)合作，使用OSD作為他的StorageWork可擴展文件系統(tǒng)的重要部分。
? ? 對于對象存儲來講，不光是解決了數(shù)據(jù)存儲的問題，同時它還解決了數(shù)據(jù)安全性的問題。存儲通常已經(jīng)依賴于客戶端和私有網(wǎng)絡的認證來保護系統(tǒng)的安全性，不管在文件服務器內(nèi)用的是FCSAN或SCSI陣列。對象存儲體系結(jié)構(gòu)在每一個級別上都提供了安全性：存儲系統(tǒng)對存儲設備的認證;存儲系統(tǒng)對計算節(jié)點的認證;存儲系統(tǒng)對計算節(jié)點命令的認證;所有命令都經(jīng)CRC的完整性檢查;數(shù)據(jù)和命令經(jīng)由IP的私有性。這樣的安全水平能給用戶以信心，他們可以用更經(jīng)濟高效，可管理并容易訪問的網(wǎng)絡，如以太網(wǎng)，作為存儲的傳輸工具，同時還提高了整個存儲體系的安全性。

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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
One-day shipping available

NetApp FAS3020 / FAS3050 – FAS3040 / FAS3070 Spares Kit

DECRU NetApp DataFort S110 NAS SCSI Security Appliance

NetApp F760 w/ DS14 (13×72 Gb) & FC9 (6×36 Gb)

NetApp X3128 NVRAM III Card 128MB SP-3128 – NEW

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

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NetApp FAS960 Network Appliance Filer Head
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp NetCache C3300 6 X 72GB 10K FC
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NetApp FAS3020 Filer DS14MK2 14x 144GB 10K X274B-R5 2TB
1 Year Warranty! Ask about Disk Shelves! WE BUY SURPLUS

Network Appliance NetApp VTL700 Virtual Tape Library

NetApp X900A-ESH2-QS-R?5-C DS14MK2 SHLFACPS14x300G?B

NetApp SP-2050B Dual Port FC-AL Controller (LC) – NEW

NetApp X2051A Dual Port FC-AL Controller Tape (LC) NEW

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

NetApp Dual Optical X2044B Controller (SP-2044B) – NEW

NetApp SK-F760B Spares Kit for F760 Filer – NEW

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StoreVault S550 by NetApp iSCSI Storage Array 6TB
￡2250 ex VAT,Free WW UPS Delivery, Tested

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NetApp C1105B NetCache

NetApp F840 Filer Head Unit
5 Year Next Business Day Warranty on All NetApp

NetApp DS14MK4 Shelf 14x 300GB 10K FC X276A-R5 4.2TB
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.

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

Netapp X412A-R5 600GB 15K SAS Disk Drive for a DS4243

NetApp X500 14x72GB 10K DS14 Shelf

NetApp X3145A NVRAM V Card 512 MB – NEW

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NetApp X2054A-R6 quad port 1/2/4 GBIT PCIE FC Initiator

NetApp C6200 NetCache System
We buy your NetApp, EMC, IBM, SUN surplus.

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w/ Accessories – cables, railkit, gbics 1yr Warranty

NetApp NetCache X259A 100GB SATA HDD for C1300 SC300

Net app DS14MK4 (14) X276A 300GB 10K 4.2TB Disk Shelf
w/ Accessories – cables, railkit, gbics 1yr Warranty!!

**Special NetApp FAS940 Filer Head Unit
5 Year Next Business Day Warranty on All NetApp

NetApp FAS920 Filer Head Unit Network Appliance
5 Year Next Business Day Warranty on All NetApp

Netapp FAS2050 Filer Head No Disk Single Controller
We Buy Surplus Netapp, Cisco, Sun, HP, IBM, Dell

NetApp R150 Network Appliance R150 NearStore System

NetApp X1202 ATM OC-3 (UTP Copper)

NetApp X1033A Dual Ported FCP Adapter (SP-1033A)

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NetApp X5611A AT-FC Storage Controller Module

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We Buy your Surplus NETAPP, SUN, DELL, HP, CISCO, IBM
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We Buy your Surplus NETAPP, SUN, DELL, HP, CISCO, IBM.
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We Buy your Surplus NETAPP, SUN, DELL, HP, CISCO, IBM.
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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
$360 each!! QTY Available!! 1yr WARRANTY!! 949-553-6444
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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.

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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

NetApp FAS270 Filer Head w/14 X274A 144GB 10K FCAL

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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

NetApp X1201B ATM OC-3 LANE – NEW

NETAPP X287A-6PK-R5 Disk Drives,6Pack,30?0GB,15k,SAS,R5
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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

NetApp F630 Filer Head Unit
5 Year Next Business Day Warranty on All NetApp

NetApp F810 Filer Head Unit

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

NetApp 14 x 500gb MK2 AT Disk Shelf – X267, X267A disks

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，當天順豐發(fā)貨！
主營：本特利，英維思，伍德沃德，?？怂共_、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，機器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

先介紹幾點經(jīng)驗。
1、先通讀一遍“系統(tǒng)手冊”（不管能不能看懂，先了解個大概，以便學習編程時查找）；
2、由位控邏輯入手，逐漸增加定時、計數(shù)等條件，把或、與、非關系理順；
3、進而練習整數(shù)運算、實數(shù)運算、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（最好是有個物理回路驗證，比如變頻器+電機+測速傳感器）；
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)機器人配件DSQC系列和Motorola MVME系列，GE 卡件 模塊 驅(qū)動器系列為主攻。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，學會一種至于其它的學習起來也就簡單了。

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