Does anyone have a workaround for IOMeter not writing logs to disk? I believe this is because the iobw.tst file takes up the whole disk. I have had the test running, then manually created a temporary 1MB file while the disk was filling up, then deleted that 1MB file after the disk is full and while the reads and writes are being performed and this consistently produces the full log file for the test. Similarly, clearing the Recycle Bin or temporary files at this time produces the same result.
Does anyone know of a way to reserve this space for the logfile using a configuration file or something along these lines? IOMeter is part of an automated suite of tests that I'm working on and this issue is preventing full automation.
You have to compile Dynamo with "DETAILS" and/or "DEBUG" flags "on".
Then dynamo will store all the info into ~/std.out log (if you're under linux)
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I am using Azure data Lake Store for files Storage. I am using operations like
Creating a main file
Creating part files
Appending these part files to main file (for Concurrent append)
Example:
There is main log file (eventually will contain logs from all
programs)
There are part log file that each program creates solely and then
append to the main log file
The workflow runs really file but i have noticed some unknown file getting uploaded onto the store directory. These files name is a GUID an has no extension, moreover these unknown files are empty.
Does anyone knows what might be the reason for these extra files.
Thanks for reformatting your question. This looks like some processing artefacts that probably will disappear shortly after. How did you upload/create your files?
I configured Debug Diag on Production where I set a Crash rule for a specific app pool with action type Long Stack Trace. But the problem is it's generating dump file those are very large in size approx 700mb each. I'm not sure why these files are too large. Is there a way to truncate it?
When you use "Log Stack Trace" option, the callstack for the exception will be logged in to a text file (not dump file) that Debug Diagnostic generates for the process to which it is attached to. I am assuming that the dump is getting generated if your process is crashing with a 2nd chance exception (that is, if you didn't change anything else in the default crash rule).
If you look at the name of the dump file, you would be able to identify on what exact condition the dump got generated.
I have to read the MFT file of a running Windows (XP or higher) and through it to reach the HD sectors that held the contents ($DATA) of a specific file that exists on the machine.
The problem is that between the time of reading the MFT until the fetching of the relevant sectors and reading them, the file system structure can vary and the locations may not be relevant anymore.
Is there a way to "freeze" the system for a certain time? Perhaps guarantee that there will not be changes for this file? Lock a specific file in order to make it not moving between sectors? (Including due to optimizations and changes in indirect)
Of course I would prefer not to copy the entire hard disk and to work statically since it's a slow operation that would disallow normal use of the system at this time. Needless to say, I don't want to use the API functions of the OS or to write a driver.
I'd simply open the file, requesting read/write access, with read share mode. If you succeed to open the file, you're guaranteed that data will not change until you close the handle. See https://msdn.microsoft.com/en-us/library/windows/desktop/hh449422%28v=vs.85%29.aspx
If you want to achieve that on files that are already opened and locked by different processes, that's entirely different story and I believe you have to write own filter driver.
If the file location in the system varies, it will be accordingly reflected in the MFT. So instead of trying to stop any activity for the file you can simply compare the MFT info before and after reading the file. Unless you are de-fragmenting or deleting contents of the file the file storage structure will not change. Additions to files do not affect the consistency of data that you read. So if this is your scenario, you can just go ahead with the above method.
I like rsync. I can see what files will be deleted first. But what happens if during the backup, a sector of the source disk fails? Files could be deleted from the destination that should not be. However, if I check the log file for all deletion files first, then use the log file as instructions to rsync, then a source disk failure during backup should result in a lower probability of data loss.
I've read the man page and have to conclude that the answer is no. If not rsync, then what?
You can mitigate source disk failure risk using
--delete-after receiver deletes after transfer, not during
That will not delete files if a IO error is produced during copy.
But for ensuring integrity of your backup, I think the right way is using:
--only-write-batch=FILE like --write-batch but w/o updating destination
That will write diffs into a file. Once batch is created, you move it to destination machine, and apply diffs with:
--read-batch=FILE read a batched update from FILE
Recently, I encountered an unknown problem causing particular folder in NTFS folder to be corrupted in multiple computers. I need to detect if the folder is corrupted and perform actions like relocate the folder or send notifications. However I do not know how to do it yet. The normal APIs, like OpenFile/CreateFile seems to be malfunctioning with the corrupted folder and I can not use them to determine if a Folder is corrupted. So I plan to parse MTF structure and check for problem directly.
Therefore, I began to study the NTFS MFT structure. I found that $Volume has a dirty flag to determine if a drive needs chkdisk. But it is not directly related to file corruption and will be set if Windows is shutdown unexpectedly. DI failed to find a particular flag or anything to determine if an INDEX or FILE is corrupted in MFT structure.
Could I know if there is a way to determine a corrupted NTFS Folder?
Any help is appreciated!
I found 3 things that are related with NTFS disk corruption issues. It is incomplete; however, without updated NTFS source code, it is very hard to find out what Microsoft was really doing in chkdisk. I will just post what I found it in case if anyone needs to know it.
1 Dirty Flag in $BadClus of "File Records" section
If the flag in $BadClus is set to ON, then the operating system will perform a disk scan at boot-up. I believe NTFS module would set the flag to ON if encounter disk operation.
2 "BAAD" in identification field of a file record
If there is something wrong with file record, for example USA/USN unmatched, then MFT may replace "FILE" with "BAAD" in identification field of a file record structure. It can be used to identify corrupted file/directory quickly.
3 Compare USA/USN in every FILE/INDX record
Both FILE/INDX structure contains USA/USN for corruption check. Scan through the system and compare USA and USN could help you discover corruption issue.