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  • 1.  Backup compression with windows

    Posted Mon December 06, 2021 03:41 AM
    Hi,

    did anyone successfully use 7-zip or something else as BACKUP_FILTER and RESTORE_FILTER ?
    With the 14 years old windows port of gzip it's possible to use the filters, but the speed and the compression are realy bad compared to 7-zip.

    Thanks.

    Joe

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    Josef Albert
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    #Informix


  • 2.  RE: Backup compression with windows

    IBM Champion
    Posted Mon December 06, 2021 04:47 AM
    Try searching the web for e.g. "BACKUP_FILTER pigz", I do remember this (and others) being discussed somewhere (in the sense of "being used and working").

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    Andreas Legner
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    Original Message


  • 3.  RE: Backup compression with windows

    IBM Champion
    Posted Mon December 06, 2021 07:16 AM
    Josef:

    You can use pigz, just be careful, depending on the options you pass to pigz it can use every cycle from every core on your machine to 0% idle! Fast as lightning though.

    Art

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    Art S. Kagel, President and Principal Consultant
    ASK Database Management Corp.
    www.askdbmgt.com
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    Original Message


  • 4.  RE: Backup compression with windows

    Posted Tue December 07, 2021 03:15 AM
    As others have said, "pigz -pn" is a trusted option, limiting it to "n" of your cores or it will use all by default. Source is here, though you would need a C compiler and the "zlib" library:

    https://zlib.net/pigz

    Have never used on Windows, but have found this for you:

    https://sourceforge.net/projects/pigz-for-windows/files/pigz-win32.zip/download

    There may be a 64-bit compiled version out there, but not easily found.


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    Doug Lawry
    Oninit Consulting
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    Original Message


  • 5.  RE: Backup compression with windows

    Posted Thu December 09, 2021 01:46 AM
    Thank you guys, pigz (32-bit port) is working fine :)

    BACKUP_FILTER		'C:\Program Files (x86)\Pigz\pigz.exe --fast --processes 3 --blocksize 512'
RESTORE_FILTER		'C:\Program Files (x86)\Pigz\pigz.exe --decompress'​

    Fast compression is enough, there is not much difference between --fast and --best. (--best needs a little less space but much more time)



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    Josef Albert
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    Original Message


  • 6.  RE: Backup compression with windows

    IBM Champion
    Posted Fri December 10, 2021 09:33 AM

    Joseph:

    If the 32-bit port supports it, you might try testing with the numbered compression options to find the "sweet spot." –fast translates to -1, while –best translates to -9; I've found that somewhere between -3 and -5 provides the best balance of compression and performance.




    Original Message


  • 7.  RE: Backup compression with windows

    IBM Champion
    Posted Fri December 10, 2021 09:34 AM

    [I believe if you don't specify –fast or –best or any numbered option, it defaults to -5]




    Original Message