What Hardware / Which setup?

Hi Guys
As a newbie to servers I am hoping that someone can please give me some advice. I am looking to but a server basically to get my feet wet and start learning about networking, servers, services and web development. I am currently looking at an Xserve and either a Mac pro or iMac as the client - fortunately I have a good budget available . I have a couple of questions really about my idea?
1. Should I add raid mirroring to the Xserve to act as a backup or can I use something like time machine with an external hard drive?
2. How would I go about connecting all this up, I assume I would need a switch? If yes which one and why? I currently have a Draytek Vigor 2600vg wireless broadband router - would this work in place of a switch?
3. Could someone clarify that I could connect to the server via VPN to access files from a remote computer over the internet?
4. Would I benefit from any other hardware/software other than an xserve, client (mac pro/imac), switch and cabling?
5. Can I mix and match servers in the future, i.e. a Dell server running Linux - Ubuntu
Thanks for your time
Best regards
Jim

1. Should I add raid mirroring to the Xserve to act as a backup or can I use something like time machine with an external hard drive?
Rule number 1 - repeat after me. RAID is NOT backup. RAID is NOT backup. RAID is NOT backup.
RAID can provide protection against disk failure - a disk fails and you keep ticking. But that's it.
If your mail server configuration gets corrupted, it's corrupted on all disks in the mirror (if you're using mirror RAID). If your users' mailboxes get corrupted, they're corrupted on all disks in the mirror. If you delete a file, it's deleted on all disks in the mirror. Do you see where I'm going here?
RAID doesn't offer any chance of restore, which is an essential element in any backup process.
For maximum reliability and uptime you want BOTH backup and RAID.
You want RAID to protect you against real-time disk failure. You want backup to protect you against accidental file deletion and corruption issues.
2. How would I go about connecting all this up, I assume I would need a switch? If yes which one and why? I currently have a Draytek Vigor 2600vg wireless broadband router - would this work in place of a switch?
I have no idea about that Draytek - it's not listed as a current product on their site, so I have no way of checking its specs. If it's only a wireless router then it will not work since there's no wireless support on the XServe, so at the very least you'll need something with ethernet ports.
3. Could someone clarify that I could connect to the server via VPN to access files from a remote computer over the internet?
Probably. Mac OS X Server has a built-in VPN server that's pretty easy to configure. The biggest issue will be in network topology - how to get external connections to the server, and how your subnet(s) are set. In all, it can be done will somewhere between little and lots of work
4. Would I benefit from any other hardware/software other than an xserve, client (mac pro/imac), switch and cabling?
While the XServe is designed for 24/7 server operations (hot-swap drives, power supplies, etc.) it really is designed to sit in a rack. If you don't have a rack then there's little point in getting an XServe over a MacPro, especially for a test/learning environment. At 30" deep it's not something that will easily sit on a desk.
5. Can I mix and match servers in the future, i.e. a Dell server running Linux - Ubuntu
Mix and match to do what? You can have whatever servers you like running whatever services you like. Whether they're integrated or standalone, though, makes a big difference, but it depends on what you want to do with them.

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http://www.eurotherm.com/
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2.BIOS version: AMI V3.70
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Merry Chrismas everydody.
Back with happy news :
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For moderators, you can modify the subject by adding [solved] if you want.
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Process:         airportd [53]
Path:            /usr/libexec/airportd
Identifier:      airportd
Version:         ??? (???)
Code Type:       X86 (Native)
Parent Process: launchd [1]
Date/Time:       2011-10-21 20:06:16.761 -0500
OS Version:      Mac OS X 10.6.8 (10K540)
Report Version: 6
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000004
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0   airportd                                0x00001303 0x1000 + 771
Thread 1: Dispatch queue: com.apple.libdispatch-manager
0   libSystem.B.dylib                       0x9416b382 kevent + 10
1   libSystem.B.dylib                       0x9416ba9c _dispatch_mgr_invoke + 215
2   libSystem.B.dylib                       0x9416af59 _dispatch_queue_invoke + 163
3   libSystem.B.dylib                       0x9416acfe _dispatch_worker_thread2 + 240
4   libSystem.B.dylib                       0x9416a781 _pthread_wqthread + 390
5   libSystem.B.dylib                       0x9416a5c6 start_wqthread + 30
Thread 2:
0   libSystem.B.dylib                       0x9416a412 __workq_kernreturn + 10
1   libSystem.B.dylib                       0x9416a9a8 _pthread_wqthread + 941
2   libSystem.B.dylib                       0x9416a5c6 start_wqthread + 30
Thread 0 crashed with X86 Thread State (32-bit):
eax: 0x00000000 ebx: 0x00001303 ecx: 0xa045075c edx: 0x00000001
edi: 0xbffffdbc esi: 0x000b4000 ebp: 0x000290ed esp: 0xbffffdc4
   ss: 0x0000001f efl: 0x00010286 eip: 0x00001303   cs: 0x00000017
   ds: 0x0000001f   es: 0x0000001f   fs: 0x00000000   gs: 0x00000037
cr2: 0x00000004
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    0x1000 -    0x38ff7 airportd ??? (???) <FD7BB2CF-9AD4-3CED-215B-34500E4A375D> /usr/libexec/airportd
   0x44000 -    0x6ffff libpcap.A.dylib ??? (???) <0134BE99-68F2-8739-D3D1-39620777086A> /usr/lib/libpcap.A.dylib
   0xb6000 -    0xd7fe7 com.apple.SystemConfiguration.EAP8021X 10.0.1 (1.0) <B95AF27B-DBE5-FBA6-DC53-68BFB0FBBA73> /System/Library/PrivateFrameworks/EAP8021X.framework/EAP8021X
0x8fe00000 - 0x8fe4163b dyld 132.1 (???) <4CDE4F04-0DD6-224E-ACE5-3C06E169A801> /usr/lib/dyld
0x90f12000 - 0x91094fe7 libicucore.A.dylib 40.0.0 (compatibility 1.0.0) <D5980817-6D19-9636-51C3-E82BAE26776B> /usr/lib/libicucore.A.dylib
0x920a2000 - 0x920a5fe7 libmathCommon.A.dylib 315.0.0 (compatibility 1.0.0) <1622A54F-1A98-2CBE-B6A4-2122981A500E> /usr/lib/system/libmathCommon.A.dylib
0x92157000 - 0x9219dff7 libauto.dylib ??? (???) <29422A70-87CF-10E2-CE59-FEE1234CFAAE> /usr/lib/libauto.dylib
0x928db000 - 0x928e7ff7 libkxld.dylib ??? (???) <9A441C48-2D18-E716-5F38-CBEAE6A0BB3E> /usr/lib/system/libkxld.dylib
0x93a3b000 - 0x93a49fe7 libz.1.dylib 1.2.3 (compatibility 1.0.0) <33C1B260-ED05-945D-FC33-EF56EC791E2E> /usr/lib/libz.1.dylib
0x94144000 - 0x942ebff7 libSystem.B.dylib 125.2.11 (compatibility 1.0.0) <2DCD13E3-1BD1-6F25-119A-3863A3848B90> /usr/lib/libSystem.B.dylib
0x9576c000 - 0x959d2ff7 com.apple.security 6.1.2 (55002) <64A20CEB-E614-D35F-7B9F-246BCB25BA23> /System/Library/Frameworks/Security.framework/Versions/A/Security
0x969ef000 - 0x96b6afe7 com.apple.CoreFoundation 6.6.5 (550.43) <10B8470A-88B7-FC74-1C2F-E5CBD966C051> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
0x96bee000 - 0x96c9bfe7 libobjc.A.dylib 227.0.0 (compatibility 1.0.0) <9F8413A6-736D-37D9-8EB3-7986D4699957> /usr/lib/libobjc.A.dylib
0x971a8000 - 0x97205ff7 com.apple.framework.IOKit 2.0 (???) <3DABAB9C-4949-F441-B077-0498F8E47A35> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
0x97f82000 - 0x97fbfff7 com.apple.SystemConfiguration 1.10.8 (1.10.2) <50E4D49B-4F61-446F-1C21-1B2BA814713D> /System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfi guration
0x9892e000 - 0x989e7fe7 libsqlite3.dylib 9.6.0 (compatibility 9.0.0) <52438E77-55D1-C231-1936-76F1369518E4> /usr/lib/libsqlite3.dylib
0x99ae8000 - 0x99b52fe7 libstdc++.6.dylib 7.9.0 (compatibility 7.0.0) <411D87F4-B7E1-44EB-F201-F8B4F9227213> /usr/lib/libstdc++.6.dylib
0xffff0000 - 0xffff1fff libSystem.B.dylib ??? (???) <2DCD13E3-1BD1-6F25-119A-3863A3848B90> /usr/lib/libSystem.B.dylib

What hardware ?

Hi all,
I am working on a new experimental set up for my thesis and I want to control
the whole process using LabView 8.
The set up has two chambers each one connected to a capacitance manometer
(http://www.mksinst.com/cgi-bin/product.exe?pid=626a) and, 4 solenoid
valves (http://www.mksinst.com/pdf/HPSEMCvDS.pdf) to control the flow.
My goal is to open the valves when the pressure reaches a certain value in each
chamber using LabView.
So far I have ordered the valves with 24v DC solenoids (1.3 A initial /
0.3 A running) and an external power supply for all of them. For the
capacitance manometers I have ordered a Digital Power Supply
(http://www.mksinst.com/pdf/Pdr2000ds.pdf) with an Rs-232 interface.
I am very new to LabView and I am not an electrical engineer.
I don't know what
hardware I need to connect the valves and the manometers to the PC.
Any suggestions?
Regards,
George.

Hi Gef,
I've used NIs ER-8 (and ER-16) relay boxes,and your current-requirements are within specs for these relays. Don't know how long they last when switched at 1.5 amps... You can control the ER-8 with an inexpensive DIO board (DIO24?) - anyway pick the DIO board from the options listed on the ER-8/16 page.
It looks like you may want some analog-input (voltage measuring) capability for your pressure-transducers(?) If so, you might do both DIO and analog-INs with one multifunction DAQ board... and a mess of accessories for cabling multifunction board to the ER-8 as well as an anaolg break-out box. I wouldn't do that ! If you need analog-INs, I'd advise a seperate analog board (w/breakout box) and cable straight to the BO-box!
Cheers.
When they give imbeciles handicap-parking, I won't have so far to walk!

What Hardware / Which setup?

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