![]() Is there any way to move the files faster in machineA. ![]() I am copying PRIMARY_PARTITION files in PRIMARY folder and SECONDARY_PARTITION files in SECONDARY folder in machineA. || scp -o ControlMaster=auto -o -o ControlPersist=900 $SECONDARY/. || scp -o ControlMaster=auto -o -o ControlPersist=900 $PRIMARY/.įor sl in -o ControlMaster=auto -o -o ControlPersist=900 $SECONDARY/. SECONDARY_PARTITION=(1 2 4 6 8) # this will have more file numbers around 200ĭir1=$(ssh -o "StrictHostKe圜hecking no" ls -dt1 "$MEMORY_MAPPED_LOCATION"/ | head -n1)ĭir2=$(ssh -o "StrictHostKe圜hecking no" ls -dt1 "$MEMORY_MAPPED_LOCATION"/ | head -n1)įor el in -o ControlMaster=auto -o -o ControlPersist=900 $PRIMARY/. PRIMARY_PARTITION=(0 3 5 7 9) # this will have more file numbers around 200 Readonly MEMORY_MAPPED_LOCATION=/data/pe_t1_snapshot Readonly FILERS_LOCATION=(machineB machineC) Readonly SECONDARY=/export/home/david/dist/secondary Readonly PRIMARY=/export/home/david/dist/primary I need to copy around 400 files in machineA from machineB and machineC and each file size is 1.5 GB.Ĭurrently I have my below shell script which works fine as I am using scp but somehow it takes ~ 2 hours to copy the 400 files in machineA which is too long for me I guess. So suppose if this is the latest date folder 20140317 inside /data/pe_t1_snapshot then this will be the full path for me - /data/pe_t1_snapshot/20140317įrom where I need to start copying the files in machineB and machineC. So whatever date is the latest date in this format YYYYMMDD inside the above folder - I will pick that folder as the full path from where I need to start copying the files. In machineB and machineC there will be a folder like this YYYYMMDD inside this folder - /data/pe_t1_snapshot So I will try to copy from machineB first, if it is not there in machineB then I will go to machineC to copy the same files. If the file is not there in machineB, then it should be there in machineC for sure. **Įxample code from the Example Code Exchange in the NI Community is licensed with the MIT license.I am running my shell script on machineA which copies the files from machineB and machineC to machineA. ![]() **This document has been updated to meet the current required format for the NI Code Exchange. Choose a destination location, preferably on separate disk or mass storage device.Choose a large file (greater than 1 GB to see process).Open and Run " File_Transfer_w_Progress_Bar.vi.We have had very good transfer rated with either ESATA or Thunderbolt connected external drives. However, experiment with your system and transfer links (internal ESATA or Ethernet link). From hard-disk-to-hard-disk tests on our system the around 4 MB (the default value in the program) appears to be the block size sweet spot. ![]() There is an optimum data block size to for the fastest transfer: To small (1 MB) and there are too many Read/Write function swaps, to large (~10 MB) and data to go into memory and it all bogs down. (When "Write Caching" is enabled, the transfer process starts off very fast (at the rated the date can be read) and then eventually slows down once the system memory is filled up.) We normally disable the "Write Caching" (Properties/Hardware/Policies) since it adds an unexpected lag to the transfer process. If the destination disk has "Write Caching" enabled (as most do) there can be significant lag between the apparent end of the transfer and when the program terminates as the data is emptied from the memory. To "Move" a file, the source file is deleted if there is no errors at the end transfer process. The last part of the source file that is less than the block data size is written to the destination on the final loop of the process. The progress bar is set up between zero and the integer value and tied to the index of the transfer "While" loop. The number of Read/Write transfers is calculated from the File size divided by the Data Block size and rounded down to the nearest integer (modulo function). (This is similar to saving data in a binary streaming mode.) The data transfer block size is based on the users target block size trimmed to be an integer number of the destination disk's sector. The program performs the file transfer by opening a file at the destination location, then reading a block of binary data from the source and writing the block of the data to the destination. This example program uses native LabVIEW function to efficiently transfer large files while showing the progress of the transfer. (In XP you could periodically check the size of the destination file to monitor the transfer process) With Widows 7, you cannot monitor the transfer process (using "Copy" or "Move" functions) because the final file size is allocated at the beginning of the process. When transferring large file from one disk to another, it is often advantageous to show a progress bar to the operator.
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