Question regarding file locking...

Hi all--
Here's the essential question...
If I have a shared file across the network that will be subjected to multiple accesses from multiple clients. Most just need to read it, but some will occassionally need to write to it. If my client application obtains a lock on the file using FileLock myLock = myFileInputStream.getChannel().tryLock(), will other clients still be able to read the file?
in other words, is the file lock obtained a "read-only" lock, preventing writing but allowing reading? or will other client's be unable to read the file when someone has a FileLock on it?
Right now we use an excel spreadsheet. It's an utterly terrible solution, but what's good about the spreadsheet is that everyone can read it, but if someone has accessed it to begin with, you only have read-only access to it. Which is good...
can I do the same thing using Java file-lock? Allowing the first client who accesses it to obtain a full-permisions lock but subsequent clients only are able to obtain read-only access?
Thanks for the help!

The docs are rather specific that all of the functionality for FileLock is platform dependent.
So you should test it.

Similar Messages

Several questions regarding File Vault

Hi!
I have several questions regarding File Vault - right now I'm using Mac OS 10.4.8
1.: The battery lock of my iBook is defect thus it happens from time to time that while transporting it the battery drops out while the laptop is sleeping. What happens with the File Vault-disk image?
2.: I want to (have to ) set up my Intel iMac again. The installer-CD I have will bring it back to 10.4.6
AFAIK the data format used for File Vault since 10.4.7 is version 2. What happens if I encrypt my stuff now (10.4.8 - thus version 2), back it up to my backup disc, install a new system (10.4.6 - therefore version 1) and want to access my data via Migration Manager (don't want to use archive and install)?
3.: How do I actually do a backup of my data while the system is running? The backup should be encrypted as well.
I use the demo-version of SuperDuper for backing up my system because with it I can ensure that I have a complete bootable backup of my running system.
Thanks for your answers in advance
ibook g4 12" 1.2 GHz 768 MB RAM / Intel iMac Core 2 Duo 17" 2.0 GHz 2GB RAM Mac OS X (10.4.8)

Parker,
You said:1. If it did, Apple would not use FileVault, as everyones computer will have a battery problem once in their life, and Apple would lose buisness from angry people who lost all of their data.I have seen enough reports of data loss with FileVault that I feel compelled to dispute your statement.
In Data corruption and loss: causes and avoidance, Dr. Smoke writes...If your data-security needs demand FileVault, you should backup your encrypted Home folder regularly, preferably daily. Like any hard drive or disk image, a Home folder protected by FileVault — an encrypted, sparse disk image — does not respond well to the causes of data corruption...Loss of power definitely is a cause of data corruption.
For Niels....,
An Unencrypted Look at FileVault, by François Joseph de Kermadec is an excellent discussion of the features, pitfalls, and cautions regarding Filevault.
Although the article discusses Panther and is dated 12/19/2003, the concepts as they apply Tiger have not changed.
The cautions and warnings are prominent in any of the Apple Knowledge Base articles referring to the use of FileVault. If a user is unfamiliar with any aspect of FileVault, it should not in my opinion be activated.
As good as FileVault is in protecting your sensitive data, it also presents the danger of locking up your files in an irretrievable ball of one's and zero's. Backups are critical. You must ensure that you have a comprehensive backup plan. Backup and Recovery, by Dr. Smoke is a fine example of what you need to consider.
;~)

Question regarding File Content Conversion

Dear SAP experts,
I need you expert advise regarding this.
I have here my sample structure,
CSV ---> this is the message type of the message
   '-- ROOT --> this is the root node
           '-- FieldA --> has a value of "Filename"
           '-- Field B
                  '-- subfield1 --> has a value of "A"
                  '-- subfield2 --> has a value of "B"
                  '-- subfied3 --> has a value of "C"
I want to output this flatfile,
subfield1;subfield2;subfield3
A;B;C
the output flatfile must have Header lines (subfield1;subfield2;subfield3)
What will be the correct parameters in my File Content Conversion, so as, the value "Filename" will not be included in the output flatfile?
Recordset Structure: ?
Kindly advise.
Thank you very much!
Fred

Refer
FCC
Ref:
Sender -
/people/venkat.donela/blog/2005/03/02/introduction-to-simplefile-xi-filescenario-and-complete-walk-through-for-starterspart1
Key value:
/people/venkat.donela/blog/2005/06/08/how-to-send-a-flat-file-with-various-field-lengths-and-variable-substructures-to-xi-30
/people/anish.abraham2/blog/2005/06/08/content-conversion-patternrandom-content-in-input-file
/people/shabarish.vijayakumar/blog/2005/08/17/nab-the-tab-file-adapter -
/people/jeyakumar.muthu2/blog/2005/11/29/file-content-conversion-for-unequal-number-of-columns
/people/shabarish.vijayakumar/blog/2006/02/27/content-conversion-the-key-field-problem
/people/michal.krawczyk2/blog/2004/12/15/how-to-send-a-flat-file-with-fixed-lengths-to-xi-30-using-a-central-file-adapter
/people/shabarish.vijayakumar/blog/2005/08/17/nab-the-tab-file-adapter
Receiver FCC no need of Endseparator
/people/shabarish.vijayakumar/blog/2007/08/03/file-adapter-receiver--are-we-really-sure-about-the-concepts
Receiver-
/people/arpit.seth/blog/2005/06/02/file-receiver-with-content-conversion

Odd question regarding files on a mac-formatted external drive...

I have recently purchased a Western Digital external HDD (1TB) and have synced it with my mac as a time machine.
I have also, however, moved a bunch of files from my macbook, including family movies, DVD's I've ripped, a lot of my music collection, work files and some games.
This has worked brilliantly thus far.
BUT! I have my MBP bootcamped for some boring programs for work etc. but want to be able to listen to music/play games/access files through the WD HDD... This may be obvious to many people; but it wasn't immediately obvious to me: Because the External drive is formatted for Mac, as well as 'time machine-d', it refuses to be recognised by the PC...
Thus, my question is:
Is there a way to move files from Mac to PC (bootcamped) through an external drive that is formatted to the Mac.
If not, is there a way to move files from Mac to PC through the bootcamp disc on the Macintosh Desktop. I understand that files smaller than 4 gigs can be moved across NTFS (?) but some of the files for my work stretch as far as 11 gigs...
Any help with this would be greatly appreciated! I've been looking around the net for the past week... It's time to be proactive...
If any more info is required, please let me know.
Ollie.

Hi Ollie,
with the BootCamp 3.0 Drivers Apple introduced a read access from BootCamp Windows to Mac OSX partitions, but this seems to only work with internal harddisks not with external ones.
MacDrive is the choice get full read and write access on Mac OSX partitions/harddisks while in Windows http://www.mediafour.com/products/macdrive/
For a simple read-only access HFSExplorer can be used http://hem.bredband.net/catacombae/index2.html
The 4GB size limitation is only active on FAT32 file system not on NTFS, but Mac OSX itself can only read from NTFS partitions not write to them without additional helper like NTFS-3G http://macntfs-3g.blogspot.com/
So, with you scenario (external HD = MacOS file system) it seems that MacDrive would be the way to go.
Hope it helps
Stefan

Question regarding file upload and download utility

Hi
I am able to upload file with file browse contorl of APEX. Now i want to download the uploaded file. Is it possible that if word document is uploaded then when user clicks on it to download, that document is directly opened in microsoft word. Of if PDF file is uploaded then on download it is opened with acorobat pdf.
Requirement is like when user is downloading any uploaded file denpending on file type (text,excel,pdf,doc) relative application should opened with that document.
Thanks in advance

That is controlled by settings in the browser that you cannot change. For instance, I have my browsers configured to use FoxIt PDF reader instead of Acrobat reader for PDFs, but no website could change that. The same is true when it comes to downloading vs opening. Sorry.
Tyler Muth
http://tylermuth.wordpress.com
"Applied Oracle Security: Developing Secure Database and Middleware Environments": http://sn.im/aos.book

General Question regarding File Conversion

Does flash pro provide the ability to convert video
files,such as avi, mpeg, etc to flash video? Thanks for the
help.

yes
Dan Mode
*THE online Radio*
http://www.tornadostream.com
*Must Read*
http://www.smithmediafusion.com/blog
*Flash Helps*
http://www.smithmediafusion.com/blog/?cat=11
"Joe Pau" <[email protected]> wrote in
message
news:e94jeq$o0$[email protected]..
> Does flash pro provide the ability to convert video
files,such as avi,
> mpeg, etc to flash video? Thanks for the help.

Query regarding file content conversion using file adapter

Hi All
I have a question regarding file content conversion in file adapter.
I have a file coming in the following format.
AA,111,222,333
BB,444,555,666
CC,777,888,999
My incoming message structure has a hierarchy. The CC record is a structure part of BB record. BB record is a structure part of AA record. It is like this:
AA,111,222,333
<<BB,444,555,666>>
<<<<CC,777,888,999>>>>
After file content conversion, in the resulted xml, i am getting a flat hierarchy instead of nested hierarchy.
Is it possible to get a nested hierarchy as a result of file content conversion?
Please let me know
Thanks
Chandra

Hi Udo
According to your suggestion, I am trying to use mapping.
I am getting a flat file and i am reading it.
This is my source structure:
AA,11,22,33
BB,44,55,66
CC,77,88,99
This is my required targer structure:
AA,11,22,33
<<BB,44,55,66>>
<<<<CC,77,88,99>>>>
To explain this, BB record can have multiple records of CC records.
AA records can have multiple records of BB record.
I am using removecontext node function.
CC (Source) (removecontext)-> CC (target structure)
But here, when i rightclick on source CC field in the mapping editor, i cannot see any other context except root node. So, how can i proceed here??
Many Thanks
Chandra

File locking question

Hello,
We're considering using java to write in a new(to us) file system, OCFS2. However, this file system lacks certain features expected for file locking. Our app does not use java.nio.* that much, but it does use it. My question is what exact standards does the JVM require for file locking? Or is it ad hoc?
If its ad hoc, what sys/func calls are required for locking?
Thanks,

The docs are rather specific that all of the functionality for FileLock is platform dependent.
So you should test it.

Questions regarding Alert log & Control file

Hello,
This is my first post to this forum. I'm new at administrating a database 11.2.0.3. I have couple of questions regarding Oracle DB.
1)Which one is preferred method among the two?
Checking alert log fie manually or automating a shell script for checking alert log file.
2) Does setting CONTROL_FILE_RECORD_KEEP_TIME parameter to zero make the database unrecoverable, if RMAN recovery catalog is not used?
Any help will be highly appreciated. Thanks in advance.
Regards

1)Which one is preferred method among the two?
Checking alert log fie manually or automating a shell script for checking alert log file.
That depends on your comfortability - But checking alert log is good.
2) Does setting CONTROL_FILE_RECORD_KEEP_TIME parameter to zero make the database unrecoverable, if RMAN recovery catalog is not used?
Yes - you cannot recover your database if it set zero and doesn't have recovery catalog.

File Locking in XI-

Hi all,
   I need to implement file locking technology for all of my interfcaes.Could anyone explain me the basics and detailed procdure for this?
Thanks
Rajesh

Hi Rajesh,
Look into the Note 821267 (3 question).
Unfortunately, the J2EE 1.3 technology the File Adapter is built upon does not support file locking. This limitation affects the File Adapter's operation. Depending on whether the JRE implementation for the operating system under which the adapter runs uses mandatory file locking or advisory file locking, opening a file that is currently being written to by another process will fail or not.
If opening the file fails, no problem exists and the adapter will try to open the file each poll interval until it succeeds.
However, if opening the file is not prevented by the operating system, the adapter starts to process the file although it is still being modified. Since XI 3.0 SP11 / PI 7.0 there is a parameter named "Msecs to Wait Before Modification Check" in the advanced settings of the File Sender channel configuration to work around this issue. This setting causes the File Adapter to wait a certain time after reading, but before sending a file to the Adapter
Engine. If the file has been modified (which is basically determined by comparing the size of the read data with the current file size of the input file) after the configured interval has elapsed, the adapter aborts the processing of the file and tries to process the file again after the retry interval has elapsed.
If this option is not available for the settings you would like to use, the following algorithm (to be implemented in your application) may be used to ensure that the File Adapter only processes completely written files:
-     Create the file using an extension, which does not get processed by the File Adapter, e.g., ".tmp"
-     Write the file content
-     Rename the file to its final name, so the File Adapter will notice its existence and pick it up
Source: SAP Note
Regards
San

WAFS/WAAS File Locking

I have run into an issue that i believe is file server related however i just want to run it by the board for clarification.
A remote site was recently converted from a standalone server site to one that is supported via WAFS/WAAS 4.0.11 installed on a 512 WAE w/ 2GB of Ram acting as wafs edge. The core is a 612 w/ 4GB of ram.
All user home folders reside across the WAN in the data center on a NetApp NAS SAN hosting the home folder natively (there is no windows server involved).
The issue is with file locking. Periodically, when a user opens a file on the server that is already been opened they are not getting any indication that the file is in use. Once they go to save the file they are told by the system that they cannot save the file using the same filename since it is being modified.
From reading the docs on WAFS/WAAS this looks like it is a problem with the OpLocks coming from the NetApp NAS and nothing to do with WAFS since WAFS/WAAS doesn't act on file locking requests, only passing them through to the file server.
Are my assumptions correct in this regard? Could WAFS be interferring some how with this communication and causing the file locking information being received from the NetApp NAS not to be correctly sent to the client?
Any way for me to debug this besides a packet capture? Any show commands that could indicate an issue? or logs?
TIA
Mike Louis

Zach,
Part of the problem appears to be packet loss of the 4050 messages. We have created a class-map to match 4050 traffic and the connectivity directive in the WAE. Hopefully this will solve some of the intermittent file locking issues we are having.
However, i had some other questions after poking around in the /expert mode of the WAE.
1. When changing the WAFS connectivity bandwidth statement the CM states that the device Edge Component must be restarted. Is there a command that will allow me to do this without rebooting the box? Can i just remove the device from the Core - Edge group and then reassign it to restart the process?
2. Under the expert mode in 4.0.11 i noticed this value:
LockManager MBean Attributes:
Name Type Access Value
MaxGrantedLock int RO 10
MaxPendingLock int RO 0
What does MaxGrantedLock mean here? Will it not grant more than 10 locks at one time?
I have about 60 simultaneous users on file shares at any one time and they are intermittently not receiving the "file in use" statement from the server. Could this be part of the problem?
Thanks in advance
Mike

Question Regarding MIDI and Sample Accuracy

Hi,
I have 2 questions regarding MIDI.
1. MIDI is moved by ticks. In the arrange window however, you can move a region by samples. When doing this, you can move within values of the ticks (which you can see on your position box that pops up) Now, will this MIDI note actually be played back at that specific sample point, or will it round the event to the closest tick? (example, if I have a MIDI note directly on 1.1.1.1, and I move the REGION in the arrange... will that MIDI note now fall on the sample that I have moved the region to, or will it be rounded to the closest tick?)
2. When making a midi template from an audio region, will the MIDI information land exactly on the sample of the transient, or will it be rounded to the closest tick?
I've looked through the manual, and couldn't find any specific answer to these questions.
Thanks!
Message was edited by: Matthew Usnick

Ok, I've done some experimenting, and here are my results.
I believe those numbers ARE samples. I came to this conclusion by counting (for some reason it starts on 11) and cutting a region to be 33 samples long (so, minus 11, is 22 actual samples). I then went to the Audio Bin window, and chose to view region length as samples. And there it said it: 22 samples. So, you can in fact move MIDI regions by samples!
Second, I wanted to see if the MIDI notes in the region itself would be quantized to the nearest tick. I cut a piece of audio, so it had a 1 sample attack (zoomed in asa far as I could in the sample editor, selected the smallest portion, and faded in, and made the start point, the region start position). I saved the region as a new audio file, and loaded it up in the exs sampler.
I then made a MIDI region, with and triggered the sample on beat 1 (quantized, on the money). I then went into the arrange window, made a fixed cycle length, and bounced the audio. I then moved the MIDI region by one sample to the right. I did this 22 times (which is the number of samples in a tick, at 120, apparently). After bouncing all of these (cycle position remained fixed, only the MIDI region was moving) I imported all the audio into the arrange on new tracks, and YES!!! The sample start was cascaded by a sample each time!
SO.
Not only can you move MIDI regions by sample, but the positions are NOT quantized to Logics ticks!
This is very good news, and glad I worked this out!
(if anyone thinks this sounds wrong, please correct me, but I'm pretty sure I proved it, in my test)
Message was edited by: Matthew Usnick

Questions regarding customisation/configuration of PS CS4

Hello
I have accumulated a list of questions regarding customising certain things in Photoshop. I don't know if these things are doable and if so, how.
Can I make it so that the list of blending options for a layer is by default collapsed when you first apply any options?
Can I make it possible to move the canvas even though I'm not zoomed in enough to only have parts of it visible on my screen?
Is it possible to enable a canvas rotate shortcut, similar to the way you can Alt+RightClick to quickly change brush size?
Is it possible to lock button positions? Sometimes I accidentally drag them around when I meant to click.
Is it possible to lock panel sizes? For example, if I have the Navigator and the Layers panels vertically in the same group, can I lock the height of the navigator so that I don't have to re-adjust it all the time? Many panels have a minimum height so I guess what I am asking for is if it's possible to set a maximum height as well.
Is it possible to disable Photoshop from automatically appending "copy" at the end of layer/folder names when I duplicate them?
These are things I'd really like to change to my liking as they are problems I run into on a daily basis.
I hope someone can provide some nice solutions

NyanPrime wrote:
<answered above>
Can I make it possible to move the canvas even though I'm not zoomed in enough to only have parts of it visible on my screen?
Is it possible to enable a canvas rotate shortcut, similar to the way you can Alt+RightClick to quickly change brush size?
Is it possible to lock button positions? Sometimes I accidentally drag them around when I meant to click.
Is it possible to lock panel sizes? For example, if I have the Navigator and the Layers panels vertically in the same group, can I lock the height of the navigator so that I don't have to re-adjust it all the time? Many panels have a minimum height so I guess what I am asking for is if it's possible to set a maximum height as well.
Is it possible to disable Photoshop from automatically appending "copy" at the end of layer/folder names when I duplicate them?
These are things I'd really like to change to my liking as they are problems I run into on a daily basis.
I hope someone can provide some nice solutions
2. No. It's a sore spot that got some forum time when Photoshop CS4 was first released, then again with CS5. It's said that the rules change slightly when using full-screen mode, though I personally haven't tried it.
3. Not sure, since I haven't tried it. However, you may want to explore the Edit - Keyboard Shortcuts... menu, if you haven't already.
4. What buttons are you talking about? Those you are creating in your document? If so, choose the layer you want to lock in the LAYERS panel, then look at the little buttons just above the listing of the layers:
5. There are many, many options for positioning and sizing panels. Most start with making a panel visible, then dragging it somewhere by its little tab. One of the important features is that you can save your preferred layout as a named workspace. Choose the Window - Workspace - New Workspace... to create a new named workspace (or to update one you've already created). The name of that menu is a little confusing. Once you have created your workspace, if something gets out of place, choose Window - Workspace - Reset YourNamedWorkspace to bring it back to what was saved.
You'll find that panels like to "stick together", which helps with arranging them outside of the Photoshop main window.
As an example, I use two monitors, and this is my preferred layout:
6. No, it's not possible to affect the layer names Photoshop generates, as far as I know. I have gotten in the habit of immediately naming them per their usage, so that I don't confuse myself (something that's getting easier and easier to do...).
Hope this helps!
-Noel

Question regarding ONT connection via Ethernet and Cable cards

Hi,
We recently upgraded to Fios Quation 150Mbps/65 plan. We are not getting the advertised speeds (we only get like 5mbps upload) so verizon is sending a tech to switch the ONT connection from coax to ethernet.
I have 2 questions regarding this new setup:
1. If the ONT communicates with the Fios Actiontect router via ethernet instead of coax from now on, How will the set top boxes and Tivo-esque cable card powered device I currently have connected to coax, talk to the verizon system from now on, if coax is taken out of the equation? Will fios signal still flow through the internal coax wiring of the house? And moreover, I was under the impression that coax was the way set top boxes communicated and derived independent ip addresses from the Fios router, for on deman purposes and what not. How will this work from now on?
Quiestion 2.
Right next to the wall where the ONT sits, theres's a basement office where we have a PC that connects to the Fios system via an Actiontect MoCa adapter (ECB2500C) which I assume derives it internet connection from the Fios Actiontec router which sits upstairs in the living room.
Again, with the Coax about to be disabled next Friday in favor of ethernet connection from the ONT, I assume this PC will be left without internet because of the lack of internet signal in the coax? Is this correct?
Question 2.5 If my above assumption is correct, since this office is right on the other side of the wall where the ONT sits outside the house, would it be possible to run an ethernet wire through the wall that connects straight from the ONT to an ethernet switch inside the office, from which I would derive a connection for this basement PC (properly firewalled of course) and then, from said switch, continue running the ethernet wire that would ultimately reach the Actiontec Fios router upstairs from which the rest of the house derives it's internet? and would this setup affect in any way the propper functioning of the cable boxes in the house?
I'd appreciate your input and any help you can provide so I can have a ballpark idea of what to tell the Fios guy to do when he comes on Friday.
Cheers.
Solved!
Go to Solution.

It's not valid to have two devices connected to the ONT, PC and VZ Router. Must be a single device. The ONT locks onto the MAC Address of the first device it sees. Since you have TV you should have the VZ router as the internet facing router.
Other options:
1. Have the VZ Router located next to the PC in the basement and then use Wireless for all other PC's.
2. Have the VZ Router located next to the PC in the basement but run one wire upstairs and connect a switch where other PCs and devices can connect via a wire.
Hope that helps.

I have some questions regarding setting up a software RAID 0 on a Mac Pro

I have some questions regarding setting up a software RAID 0 on a Mac pro (early 2009).
These questions might seem stupid to many of you, but, as my last, in fact my one and only, computer before the Mac Pro was a IICX/4/80 running System 7.5, I am a complete novice regarding this particular matter.
A few days ago I installed a WD3000HLFS VelociRaptor 300GB in bay 1, and moved the original 640GB HD to bay 2. I now have 2 bootable internal drives, and currently I am using the VR300 as my startup disk. Instead of cloning from the original drive, I have reinstalled the Mac OS, and all my applications & software onto the VR300. Everything is backed up onto a WD SE II 2TB external drive, using Time Machine. The original 640GB has an eDrive partition, which was created some time ago using TechTool Pro 5.
The system will be used primarily for photo editing, digital imaging, and to produce colour prints up to A2 size. Some of the image files, from scanned imports of film negatives & transparencies, will be 40MB or larger. Next year I hope to buy a high resolution full frame digital SLR, which will also generate large files.
Currently I am using Apple's bundled iPhoto, Aperture 2, Photoshop Elements 8, Silverfast Ai, ColorMunki Photo, EZcolor and other applications/software. I will also be using Photoshop CS5, when it becomes available, and I will probably change over to Lightroom 3, which is currently in Beta, because I have had problems with Aperture, which, until recent upgrades (HD, RAM & graphics card) to my system, would not even load images for print. All I had was a blank preview page, and a constant, frozen "loading" message - the symbol underneath remained static, instead of revolving!
It is now possible to print images from within Aperture 2, but I am not happy with the colour fidelity, whereas it is possible to produce excellent, natural colour prints using its "minnow" sibling, iPhoto!
My intention is to buy another 3 VR300s to form a 4 drive Raid 0 array for optimum performance, and to store the original 640GB drive as an emergency bootable back-up. I would have ordered the additional VR300s already, but for the fact that there appears to have been a run on them, and currently they are out of stock at all, but the more expensive, UK resellers.
I should be most grateful to receive advice regarding the following questions:
QUESTION 1:
I have had a look at the RAID setting up facility in Disk Utility and it states: "To create a RAID set, drag disks or partitions into the list below".
If I install another 3 VR300s, can I drag all 4 of them into the "list below" box, without any risk of losing everything I have already installed on the existing VR300?
Or would I have to reinstall the OS, applications and software again?
I mention this, because one of the applications, Personal accountz, has a label on its CD wallet stating that the Licence Key can only be used once, and I have already used it when I installed it on the existing VR300.
QUESTION 2:
I understand that the failure of just one drive will result in all the data in a Raid 0 array being lost.
Does this mean that I would not be able to boot up from the 4 drive array in that scenario?
Even so, it would be worth the risk to gain the optimum performance provide by Raid 0 over the other RAID setup options, and, in addition to the SE II, I will probably back up all my image files onto a portable drive as an additional precaution.
QUESTION 3:
Is it possible to create an eDrive partition, using TechTool Pro 5, on the VR300 in bay !?
Or would this not be of any use anyway, in the event of a single drive failure?
QUESTION 4:
Would there be a significant increase in performance using a 4 x VR300 drive RAID 0 array, compared to only 2 or 3 drives?
QUESTION 5:
If I used a 3 x VR300 RAID 0 array, and installed either a cloned VR300 or the original 640GB HD in bay 4, and I left the Startup Disk in System Preferences unlocked, would the system boot up automatically from the 4th. drive in the event of a single drive failure in the 3 drive RAID 0 array which had been selected for startup?
Apologies if these seem stupid questions, but I am trying to determine the best option without foregoing optimum performance.

Well said.
Steps to set up RAID
Setting up a RAID array in Mac OS X is part of the installation process. This procedure assumes that you have already installed Mac OS 10.1 and the hard drive subsystem (two hard drives and a PCI controller card, for example) that RAID will be implemented on. Follow these steps:
1. Open Disk Utility (/Applications/Utilities).
2. When the disks appear in the pane on the left, select the disks you wish to be in the array and drag them to the disk panel.
3. Choose Stripe or Mirror from the RAID Scheme pop-up menu.
4. Name the RAID set.
5. Choose a volume format. The size of the array will be automatically determined based on what you selected.
6. Click Create.
Recovering from a hard drive failure on a mirrored array
1. Open Disk Utility in (/Applications/Utilities).
2. Click the RAID tab. If an issue has occurred, a dialog box will appear that describes it.
3. If an issue with the disk is indicated, click Rebuild.
4. If Rebuild does not work, shut down the computer and replace the damaged hard disk.
5. Repeat steps 1 and 2.
6. Drag the icon of the new disk on top of that of the removed disk.
7. Click Rebuild.
http://support.apple.com/kb/HT2559
Drive A + B = VOLUME ONE
Drive C + D = VOLUME TWO
What you put on those volumes is of course up to you and easy to do.
A system really only needs to be backed up "as needed" like before you add or update or install anything.
/Users can be backed up hourly, daily, weekly schedule
Media files as needed.
Things that hurt performance:
Page outs
Spotlight - disable this for boot drive and 'scratch'
SCRATCH: Temporary space; erased between projects and steps.
http://en.wikipedia.org/wiki/StandardRAIDlevels
(normally I'd link to Wikipedia but I can't load right now)
Disk drives are the slowest component, so tackling that has always made sense. Easy way to make a difference. More RAM only if it will be of value and used. Same with more/faster processors, or graphic card.
To help understand and configure your 2009 Nehalem Mac Pro:
http://arstechnica.com/apple/reviews/2009/04/266ghz-8-core-mac-pro-review.ars/1
http://macperformanceguide.com/
http://www.macgurus.com/guides/storageaccelguide.php
http://www.macintouch.com/readerreports/harddrives/index.html
http://macperformanceguide.com/OptimizingPhotoshop-Configuration.html
http://kb2.adobe.com/cps/404/kb404440.html

Question regarding file locking...

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