Delta backup recovery needs too much memory
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#276 Delta backup recovery needs too much memory
Recovering of files that have been backed up with the "delta option" seems to load in memory every part of the file to proceed with reconstruction. This behaviour makes necessary to assign several GB of RAM to Java VM (through the Xmx variable in the Areca's ini file) in order to recover big files, and makes impossible to recover really large files (reconstruction fails and the resultant file is truncated, although no errors are reported in the log).
Since optimizing the backup of big files is the reason to use "delta backups", I would be really nice to optimize the reconstruction process.
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hi
Areca doesn't load the whole file into memory during recovery, so that type of problem shouldn't occur
Could you send me the log file that was written while recovering so I can figure out what went wrong ?
thanks
Thank you very much for your answer. I've attached two log files (one with
Xmx=256m and one with Xmx=4096m) and the configuration file I used. These
are the steps I followed:
the source there was a .pst file (from outlook) of 491MB.
backup), modified the source file, and run a second backup.
second backup 1KB.
truncated file of 99.805KB and a temporary folder lcpy0 with two subfolders
inside, containing the two original fragments of the file.
I got only the recovered file (temporary folder and files were deleted). I
could see in the Windows process monitor how the memory used by Java grew
up to 2GB more or less during reconstruction.
No errors are reported in the logs, but you can see how with Xmx=256m only
the first fragment is processed and then the recovering is reported to be
completed:
13-09-17 09:02 - INFO - Recovery filter : archive2.pst
13-09-17 09:02 - INFO - 2 archives will be processed.
13-09-17 09:02 - INFO - Files will be recovered in
C:/Users/administrator/Desktop/Recover/rcv
13-09-17 09:02 - INFO - 1 files will be recovered.
13-09-17 09:02 - INFO - Data recovery ...
13-09-17 09:02 - INFO - Recovering
C:/Users/administrator/Desktop/target/1857487966/130917 (1 file) ...
13-09-17 09:02 - INFO - Recovering
C:/Users/administrator/Desktop/target/1857487966/130917_1 (1 file) ...
13-09-17 09:02 - INFO - Processing archive 0
(C:\Users\administrator\Desktop\Recover\rcv\lcpy0\130917) - 1 entry ...
13-09-17 09:02 - INFO - Recovery of archive2.pst completed.
With Xmx=4096, the two fragments are processed, and there are some further
steps before the process is completed:
13-09-17 09:00 - INFO - Recovery filter : archive2.pst
13-09-17 09:00 - INFO - 2 archives will be processed.
13-09-17 09:00 - INFO - Files will be recovered in
C:/Users/administrator/Desktop/Recover2/rcv
13-09-17 09:00 - INFO - 1 files will be recovered.
13-09-17 09:00 - INFO - Data recovery ...
13-09-17 09:00 - INFO - Recovering
C:/Users/administrator/Desktop/target/1857487966/130917 (1 file) ...
13-09-17 09:00 - INFO - Recovering
C:/Users/administrator/Desktop/target/1857487966/130917_1 (1 file) ...
13-09-17 09:00 - INFO - Processing archive 0
(C:\Users\administrator\Desktop\Recover2\rcv\lcpy0\130917) - 1 entry ...
13-09-17 09:00 - INFO - Processing archive 1
(C:\Users\administrator\Desktop\Recover2\rcv\lcpy0\130917_1) - 1 entry ...
13-09-17 09:00 - INFO - Creating missing directories and symbolic links ...
13-09-17 09:00 - INFO - Applying metadata ...
13-09-17 09:00 - INFO - Metadata applied.
13-09-17 09:00 - INFO - Moving
C:/Users/administrator/Desktop/Recover2/rcv/archive2.pst to
C:/Users/administrator/Desktop/Recover2/archive2.pst
13-09-17 09:00 - INFO - Recovery of archive2.pst completed.
Thank you very much. You have done a great job with Areca. It's a powerful
and yet simple to use application.
On Sun, Sep 15, 2013 at 4:13 PM, aventin aventin@users.sf.net wrote:
Related
Feature Requests: #276