1 Reply Latest reply: Apr 4, 2012 4:16 AM by rdoogan-Oracle RSS

    How to setup max blocking factor on OSB for LTO4, LTO5 drives?

    User369092
      Hello,
      I found that blocking factor & max blocking factor setup on osb webtools (configure-defaults and polices-media)
      According to documents, recommanded blocking factor as below.

      LTO4->256
      LTO5->1024

      And then, How to sizing max blocking factor vaule for LTO4 and LTO5 drives?
      Please advice the recommanded max blocking factor value.

      Thanks advanced.

      daesuk
        • 1. Re: How to setup max blocking factor on OSB for LTO4, LTO5 drives?
          rdoogan-Oracle
          You can view and set the global defaults using "obtool lsp media" and "obtool setp media/blockingfactor" and "obtool setp media/maxblockingfactor". You can also set these individually for given devices if you want to do it that way. Usual a global default is probably easier to manage.

          For example

          obtool lsp media

          barcodesrequired yes
          blockingfactor 512
          maxblockingfactor 512
          overwriteblanktape yes [default]
          overwriteforeigntape yes [default]
          overwriteunreadabletape yes
          volumeretaintime disabled [default]
          writewindowtime disabled [default]

          obtool setp media/blockingfactor 1024
          obtool setp media/maxblockingfactor 1024

          obtool lsp media

          barcodesrequired yes
          blockingfactor 1024
          maxblockingfactor 1024
          overwriteblanktape yes [default]
          overwriteforeigntape yes [default]
          overwriteunreadabletape yes
          volumeretaintime disabled [default]
          writewindowtime disabled [default]


          Remember that this is a blocking FACTOR, so it is multiplied by 512bytes to get the actual block size.

          So the following are the blocking factors and then block sizes :

          128 = 64KB
          256 = 128KB
          512 = 256KB
          1024 = 512KB