10.5.8 on G4 - firewire read/write fails silently, corrupting data.

I've already posted this problem on another board here
http://discussions.apple.com/thread.jspa?threadID=2565228&tstart=0
But it seems more relevant to this forum.
I've recently encountered this problem which caused me to lose a lot of data. The setup is mac mini g4 + external firewire hard drive from Freecom.
What is happening is that read/write operations do not result in copy fidelity. Here's a terminal log to illustrate:
ariel:Freecom FW 1TB kaitlin$ cp another.avi another1.avi
ariel:Freecom FW 1TB kaitlin$ ls -lh another*
-rw-r--r-- 1 kaitlin staff 176M 2 Sep 11:48 another.avi
-rw-r--r-- 1 kaitlin staff 176M 2 Sep 12:07 another1.avi
ariel:Freecom FW 1TB kaitlin$ md5 another.avi
MD5 (another.avi) = 6eedf37d80b81f61f0c4a8f71dfea57c
ariel:Freecom FW 1TB kaitlin$ md5 another1.avi
MD5 (another1.avi) = b8cffac964d494279a508f11151ee529
So basically the original and its copy have different hashcodes which means they're not the same file, so I can't trust the firewire. It does this consistently with any file read/write operation to/from any destination. The machine does NOT behave like this with external USB drives or the internal drive.
I've got two computers, both G4 1.5 GHz of the same era (Mac mini and Powerbook 15"), and the same symptoms appear on both machines, as well as when hooking the drive up to a FW800 port.
I tried connecting the drive to a friend's Intel Mac Mini, and it does NOT exhibit this behaviour. So I'm suspecting it's a recent software update that caused the drive to fail, since I have used the same firewire disk for a few months without any problems.
I've reverted to MacOS X 10.5.0 and the problem goes away. Then I re-did the update to 10.5.8 and tested it - the problem comes back. It's present on any firewire device I could test on (including a 3rd gen firewire ipod).
So basically, firewire on 10.5.8 seems broken on a G4
- kaitlin

You seem to have done a good job of proving that the Firewire drivers in 10.5.8 don't work properly on your model of Mini. I don't think there's a UNIX solution to that problem. If the drivers are incompatible, only Apple can fix them, and it won't.
If any firmware updates were ever released for your model, make sure you have the latest one.
The only other thing you could try that you might not already have done is to do a clean install of 10.5, then run the combo updater (not a series of intermediate updaters) to get back to 10.5.8. That procedure has been reported to solve strange problems on occasion.

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Message was edited by: bennnn - added note about Ignore ownership

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My wife and I share an iMac, but use separate User accounts for separate mail accounts, etc.
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By default new files and folders grant Read/Write to the creator of the new file/folder, and read-only to the Group "Staff" in our own accounts or "Wheel" in the /Users/Public/ folder, and read-only to Everyone.
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Thanks again, V.K., for your assistance and especially for the very prompt responses.
I was unaware that I could create a volume on the HD non-destructively using disk utility. This may then turn out to be the better solution after all, but I will have to free up space on this HD and try that.
Also, I was obviously unaware of the special treatment of file creation by TextEdit. I have been using this to test my various settings, and so the inheritance of ACLs has probably been working properly, I just have been testing it incorrectly. URGH!
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I realize this is now taking this thread in a different direction, but perhaps you know what might be the cause of this and how to correct or at least know where to point me to get the answer.
Also, do you happen to know how to remove users from groups? I added myself and my wife to the Wheel group because that kept showing up as the default group for folders in /Users/Shared
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Steve

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Hi,
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I thought if I opened it on another machine I'd be stuck with read only access and not be able to work on there. I think I couldn't change it, so I thought to avoid any future problems like that I would change everything on machine!
Yikes. Won't do that again
Sarah

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Virtual Machines:
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1 Windows Server 2008 Standard Exchange Server.
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Updates
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Normal operation
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Symptoms (i.e. this happens, or does not happen, at the same time)
I we look at resource monitor on the host then we see that there is often an extensive read from a VHDX of one of the VMs (40-60 Mbyte/s) and a combined write speed to many files in \HarddiskVolume5\System Volume Information\{<someguid and no file extension>}.
See iamge below.
The combined network speed to the iSCSI SAN is about 500-600 Mbit/s.
When this happens it is usually during and after a VSS ShadowCopy backup, but has also happens during hours where no backup should be running (i.e. during daytime when the backup has finished hours ago according to the log files). There is however
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viewer).
We cannot find any indication that the VMs themself detect any problem and we see no increase of errors (for example storage related errors) in the eventlog inside the VMs.
The QNAP uses about 50% processing Power on all cores.
We see no dropped packets on the switch.
(I have split the image to save horizontal space).
Unable to recreate the problem / find definitive trigger
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Questions
Why does all VMs stop responding and why is there such intensive Read/Writes to the iSCSI SAN?
Could it be anything in our setup that cannot handle all the read/write requests? For instance the iSCSI SAN, the hosts, etc?
What can we do about this? Should we use MultiPath IO instead of NIC teaming to the SAN, limit bandwith to the SAN, etc?

Hi,
> All VMs are using dynamic disks (as recommended by Microsoft).
If this is a testing environment, it’s okay, but if this a production environment, it’s not recommended. Fixed VHDs are recommended for production instead of dynamically expanding or differencing VHDs.
Hyper-V: Dynamic virtual hard disks are not recommended for virtual machines that run server workloads in a production environment
http://technet.microsoft.com/en-us/library/ee941151(v=WS.10).aspx
> This is the primary host and normaly all VMs run on this host.
According to your posting, we know that you have Cluster Shared Volumes in the Hyper-V cluster, but why not distribute your VMs into two Hyper-V hosts.
Use Cluster Shared Volumes in a Windows Server 2012 Failover Cluster
http://technet.microsoft.com/en-us/library/jj612868.aspx
> 2 teamed NIC dedicated to iSCSI storage.
Use Microsoft MultiPath IO (MPIO) to manage multiple paths to iSCSI storage. Microsoft does not support teaming on network adapters that are used to connect to iSCSI-based storage devices. (At least it’s not supported until Windows Server 2008 R2. Although
Windows Server 2012 has built-in network teaming feature, I don’t article which declare that Windows Server 2012 network teaming support iSCSI connection)
Understanding Requirements for Failover Clusters
http://technet.microsoft.com/en-us/library/cc771404.aspx
> I have seen using MPIO suggests using different subnets, is this a requirement for using MPIO
> or is this just a way to make sure that you do not run out of IP adressess?
What I found is: if it is possible, isolate the iSCSI and data networks that reside on the same switch infrastructure through the use of VLANs and separate subnets. Redundant network paths from the server to the storage system via MPIO will maximize availability
and performance. Of course you can set these two NICs in separate subnets, but I don’t think it is necessary.
> Why should it be better to not have dedicated wireing for iSCSI and Management?
It is recommended that the iSCSI SAN network be separated (logically or physically) from the data network workloads. This ‘best practice’ network configuration optimizes performance and reliability.
Check that and modify cluster configuration, monitor it and give us feedback for further troubleshooting.
For more information please refer to following MS articles:
Volume Shadow Copy Service
http://technet.microsoft.com/en-us/library/ee923636(WS.10).aspx
Support for Multipath I/O (MPIO)
http://technet.microsoft.com/en-us/library/cc770294.aspx
Deployments and Tests in an iSCSI SAN
http://technet.microsoft.com/en-US/library/bb649502(v=SQL.90).aspx
Hope this helps!
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When I open the browser, it says as an alert regarding the profile directory and says that read/write should be changed and it doesn't work then.i uninstalled and re-installed firefox6.0.2.how can i overcome this problem

could not initialize the application's security component .the most likely cause is problems with files in your application's probile directory.please check that this directory had no read/write restrictionsand ur hard disk is not full or close to full .It is recommended that you exit the application and fix the problem.if you continue to use this session ,you mightsee incorrect application behaviour when accessing security features....THIS IS THE ALERT I GET WHENEVER I TRY TO OPEN FIREFOX.

See:
*https://support.mozilla.com/kb/Could+not+initialize+the+browser+security+component

How can I make sure files I transfer stay at read/write instead of read?

My employer recently got six brand new Mac Pros for our a/v guys. Well I wasn't able to get migrate to work (it wouldn't detect the slave drives, only the master) so I had to put files onto an external drive (a LACIE 1TB) and put them on the new Mac Pro OS 10.5.
We're finding out that files that we're moving, their permissions are being changed to read only instead of remaining at read/write or so it seems.
We've also got these machines on a closed network so we can share files between different areas of the office. Each computer has an administrator account and allows sharing and gives those it is sharing with, read/write permissions. But if I transfer a file from machine a to machine b, it comes out as read only one the file.
I'm thinking we jacked up the file sharing somewhere somehow. Curious if anyone might be able to take a crack at this. We're all new to leopard.
Screenshots:
Thanks

usually though; they are techs; and so geeky; that in windows they set themselves as admins with unlimited privaleges. So what they do is go to account setting and just delete your account; and when they delete; they will delete everything; and all your person files.
Most though; find that too troublesome; so they just reformat the drive with a backup they built; for that computer.
Most of the things you can do is deleting temporary internet files; and cookies; and any saved passwords on your account. Usually all found in options/tools in most web browsers. For windows; most files are on desktop; my music; my downloads; my documents; and etc.

10.5.8 on G4 - firewire read/write fails silently, corrupting data.

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