Forum Discussion

JAta2's avatar
JAta2
Level 4
11 months ago

Veritas System Recovery 23.1 and high compression slowdown.

Last month, with VSR 23.0, my complete backup with high compression took 1 hour and 15 minutes to run. Since then, I upgraded to 21.3 and this month it took 4 hours and 45 minutes to run. After invest...
  • akihiro1's avatar
    akihiro1
    11 months ago

    I checked the release note for VSR 23.1. But I never find new features that are related with the performance.
    https://www.veritas.com/content/support/en_US/doc/VSR_23.1_Release_Notes_EN

    If many VSS shadow copies are stored in the backup source volume, the backup performance will be lower than before. Also, the performance may be lower due to fragments.

    To be honest, the standard compression is the most effective for the backup time. High compression always takes more time than standard compression, and the compression rate for high compression is not high than expectation.

    I recommend to use the standard compression.

     

JAta2's avatar
JAta2
Level 4
10 months ago

Additional information: Only high compression cuts the target disk rate in half. No compression, standard compression, and medium compression do not affect the target disk write rate at all. So I've adjusted my compression rate to medium for now to get the best compression without a performance penalty. I have to say I have no explanation for this. CPU utilization is low even during high compression and the GPU is not being used.