1 Reply Latest reply: Aug 23, 2016 1:39 AM by Nick Dyer RSS

    Enable data digest checksums

    Robert Vilhelmsen Wayfarer
    Visibility: Open to anyone

      Hi

       

      The WIndows Toolkit deault settings for iSCSI connections on Enable data digest checksums and Enable header digest checksums is OFF.

       

      Questions:

      1. what is recommended, On or Off

      2. Is there a noticeable performance overhead when set to ON

      3. Can I on the "fly" enable and disable it on connected and mounted volumes

       

      Regards

      Robert

        • Re: Enable data digest checksums
          Nick Dyer Pioneer

          Hi Robert,

           

          Data Digest Checksums do have an overhead, mostly on CPU cycles. From looking at some internal notes - it can be as little as ~5% overhead up to 15-25% - the latter being very large sequential workloads. Of course your milage may vary.

           

          Yes, you can enable and disable it on the fly. The Nimble Connection Service (embedded within Nimble Connection Manager) maintains the relationship and availability behind the scenes.

           

          There is an iSCSI Digest FAQ available on Infosight which will assist in your ultimate question - should I or shouldn't I use it.