Files on the SAN temporarily disappear

Hi all,
I'm having an issue where, after a certain amount of use, one of the two computers I'm using connected to an XSAN hard drive will seem to "lose track" of the file structure. That is, when I click on folders on the SAN disk, they will suddenly show as empty, even though I know the files are still there (I can still see them on the other computer, for example). This is often accompanied by a spinning beach ball of death, which can be averted by relaunching the finder, though the computer doesn't start showing the files again until I do a hard power down and reset (once I go into this death spiral, the computer won't do a software restart...it just hangs endlessly after logout).
Does anyone have any ideas?
Thanks!

If your other station really is ok, that's an important troubleshooting fact, as it indicates your Xsan is functioning correctly and your issue is limited to the hanging client. An important first thing to check is that your fibre, public and private Ethernet connections are all ok. If any of them are intermittent you will get that kind of behavior.
If you have access to your fibre switch, login, highlight the ports connected to the problematic station, and click on the tab for Port Stats. If you see a lot of CRC errors, than you might have a bad fibre cable or SFP (rare). Remember that the problem might be in your wall, or if you are using a mixture of 62.5 and 50 micron fibre cable.
If you have access to Xsan Admin, see if there are any errors in your log files, or in the GUI itself under Errors and Warnings. If you are still having a problem tracking it down, an extreme idea would be to shut down both stations, and swap them. If the previously stable station, starts behaving erratically on the connections your problematic station was using, then you know you have a cabling problem.
JM

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Downloading files - can I block the empty file from appearing at all? I'm not talking about the .part file, but the one that disappears later anyways.

Let's say I'm downloading several files, for each file that I'm downloading two new files appear in my download folder. For 'vol1.rar' I have ''an empty'' 'vol1.rar' and a 'vol1.rar.part' file, same for 'vol2.rar', 'vol3.rar', etc.
I would like to block this empty 'vol1.rar' file from appearing at all - it disappears after the download is finished anyway, and the .part file gets renamed with the actual name.
I'm downloading files to my desktop, from where I move them to the folders I want them in - having this disappearing 2nd file messes up the order I download the files in - if I add a new file after one of the files I was downloading has finished, the file be placed in the empty spot that the finished file has created, making it harder for me to move to the correct folder.
A lot of people have asked if it was possible to turn off the .part file, but I haven't seen a single thread about the empty file instead.
I know this file isn't necessary, because I moved it to another folder/deleted it many times before the download was finished and the real file was still fine.
So, any ideas as to how to block this file?

I don't believe there is any way to prevent file downloading if you allow internet access at all. as Király says, whatever they download and install will be limited to the guest account and will go poof on the logout.
however you can disable CD/DVD and external drives access. some of it can be done by enabling parental controls on the guest account. for more options you can install server admin tools
http://support.apple.com/downloads/ServerAdmin_Tools_105
and use workgroup manager to set further restrictions on the guest account.
P.S. workgroup manager can also forbid guest to mount disk images which will effectively make it impossible to install any programs at all even in the guest account.
Message was edited by: V.K.

I've cleared almost 30 gig off of my hard drive in the past 2 weeks, and it will temporarily show that in the Get Info box. But hours later, I am still getting a disk full error and all of the memory has disappeared.

I've cleared almost 30 gig off of my hard drive in the past 2 weeks, and it will temporarily show that in the Get Info box. But hours later, I am still getting a disk full error and all of the memory has disappeared. I have cleared my backup logs from Time Machine, checked the mail folder, cleaned out tons of photos and videos and it still keeps filling back up.
In checking the log files, here is the message repeated over and over....
Jul 4 07:18:13 Donald-Keele-Jrs-iMac-123.local CalendarAgent[213]: CoreData: error: (21) I/O error for database at /Users/donjr/Library/Calendars/Calendar Cache. SQLite error code:21, 'unable to open database file'
Jul 4 07:18:13 Donald-Keele-Jrs-iMac-123.local CalendarAgent[213]: Core Data: annotation: -executeRequest: encountered exception = I/O error for database at /Users/donjr/Library/Calendars/Calendar Cache. SQLite error code:21, 'unable to open database file' with userInfo = {
NSFilePath = "/Users/donjr/Library/Calendars/Calendar Cache";
NSSQLiteErrorDomain = 21;
Jul 4 07:18:14 Donald-Keele-Jrs-iMac-123.local cfprefsd[180]: CFPreferences: error creating file /Users/donjr/Library/Preferences/com.apple.iPhoto.plist.t3l894p: 28
Jul 4 07:18:30 Donald-Keele-Jrs-iMac-123.local Printer Pro Desktop[275]: Empty task
Jul 4 07:18:33 Donald-Keele-Jrs-iMac-123.local Microsoft Sync Services[8149]: [0x16697c0] |ISyncSession|Warning| com.microsoft.Entourage2008: transitioning to cancel - session cancelled by server: Client 'com.microsoft.Entourage2008' tried to start a session for the plan 45AD80C3-0D52-4CF2-8CBA-103564B6C47C and the plan no longer exists.
Jul 4 07:18:33 Donald-Keele-Jrs-iMac-123.local Microsoft Sync Services[8149]: Warning: NSBundle NSBundle </Applications/Microsoft Office 2008/Office/Microsoft Sync Services.app/Contents/Resources/MicrosoftOfficeNotes.syncschema> (not yet loaded) was released too many times. For compatibility, it will not be deallocated, but this may change in the future. Set a breakpoint on __NSBundleOverreleased() to debug
Jul 4 07:18:33 Donald-Keele-Jrs-iMac-123.local Microsoft Sync Services[8149]: Warning: NSBundle NSBundle </Users/donjr/Library/Sync Services/Schemas/MicrosoftOfficeNotes.syncschema> (not yet loaded) was released too many times. For compatibility, it will not be deallocated, but this may change in the future. Set a breakpoint on __NSBundleOverreleased() to debug
Jul 4 07:18:45 Donald-Keele-Jrs-iMac-123 kernel[0]: (default pager): [KERNEL]: default_pager_backing_store_monitor - send LO_WAT_ALERT
Jul 4 07:18:45 Donald-Keele-Jrs-iMac-123 kernel[0]: macx_swapoff SUCCESS
Jul 4 07:19:31 Donald-Keele-Jrs-iMac-123.local Printer Pro Desktop[275]: Empty task
Any ideas on what to do next?
I'm running and iMac 20-inch early 2009
Processor 2.66 GHz Intel Core 2 Duo
Memory 8 GB 1067 MHz DDR3
Graphics NVIDIA GeForce 9400 256 MB
Software OS X 10.8.4 (12E55)

Step 1
Quit Calendar. Triple-click the line below to select it:
~/Library/Calendars/Calendar Cache
Right-click or control-click the highlighted line and select
Services ▹ Reveal
from the contextual menu. A Finder window should open with a file named "Calendar Cache" selected.
Move the selected file to the Trash. There may be one or two other files in the same folder with names that begin in "Calendar Cache". If so, delete those files too.
Step 2
Empty the Trash if you haven't already done so. If you use iPhoto, empty its internal Trash as well:
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To locate large files, you can use Spotlight. That method may not find large folders that contain a lot of small files.
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Back up all data now.
Install ODS in the Applications folder as usual. Quit it if it's running.
Triple-click the line of text below to select it, then copy the selected text to the Clipboard (command-C):
sudo /Applications/OmniDiskSweeper.app/Contents/MacOS/OmniDiskSweeper
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
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The application window will open, eventually showing all files in all folders. It may take some minutes for ODS to list all the files.
I don't recommend that you make a habit of doing this. Don't delete anything while running ODS as root. If something needs to be deleted, make sure you know what it is and how it got there, and then delete it by other, safer, means. When in doubt, leave it alone or ask for guidance.
When you're done with ODS, quit it and also quit Terminal.

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Are you sure about the Frame Width and Frame Height that you gave 720 x 484? Did you mean 720 x 480?
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For the Frame Rate, was it really 29.97 frames per second and you rounded it off to 29 frames per second? Or,
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If the properties that you just posted are representative of your source file, what project preset did you or the
project set for the project preset? If you are not sure, please tell us the readings for Editing Mode, Timebase, Frame Size,
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Video
video compression
audio compression
frame size
frame rate
interlaced or progressive
pixel aspect ratio
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Photos
Pixel dimensions and how many photos?
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Please do not hesitate to ask questions or to ask for clarification. We can go at whatever pace you feel comfortable with.
ATR

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When hovering cursor over file edit ect the names will disappear

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Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]
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Are there any other system files that Firefox uses that I can restore from the backup to solve the problem?
I have a Mac Pro and I am running OSX 10.6.4
I have used Firefox for many years and never had a problem before.
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This has been happening for several weeks.

It sounds like perhaps the file doesn't have an extension that the system recognizes. Is this all files, or just one specific one, and if so, which? What is the name (and extension, if it has one) of the downloaded file? What kind of file do you *expect* it to be? (PDF, or whatever). Renaming a file with the appropriate extension can often fix that kind of problem.
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Files on the SAN temporarily disappear

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