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  • 2020
    • March
      • COVID 19 simulation
        20/03/29
        Covid 19 simulation

        As I did not found yet an open source covid 19 simulation, I tried to write one myself.
        The result can be found on github https://github.com/adoerzbach/covid19simulation. I know that no simulation really is able to predict the future of the pandemic exactly. But w

  • 2018
    • July
      • Solaris 10 Ldap authentication with Windows AD server
        18/07/13
        Introduction
        Well documented is the User Management of Solaris using a Directory Server. Thisis documented in the Solaris manuals.
        How to do a SSO using a Windows AD Server is also documented on various sites.
        What is less obvious and not documented is how to just authenticate (check

  • 2016
    • October
      • Clone Pluggable Database using zfs clones
        16/10/06
        Fast cloning using zfs snapshots and clones is very simple for pluggable databases.

        In this example a pluggable database PDB1 is cloned to a pluggable database PDB4. All database files are located in /u01/PDB1 which is a zfs filesystem.

        First you need to create an xml descript

  • 2015
    • December
      • ZPOOL hangs during rollback of a zfs snapshot
        15/12/05
        Starting with Kernel Patch 150401-09 of Oracle we experienced hangs of the whole zpool when we did a rollback of a snapshot.
        Up to now (2015/12/05) there is no fix available for this problem. Last tests with Kernel patch 150401-28 where not successful.
        The hangs occur if we had to rollbac

    • July
      • Solaris rescan SCSI device on VMware
        15/07/22
        If you want to add a SCSI device on a VMware virtual maschine which is running Solaris you normally just have to use the following command to see the new device
        devfsadm
        If you do not see the disk from Solaris then you just have to use the following commands:
        root@xxxxx # cfgadm -al<

  • 2014
    • April
      • Solaris rescan SAN devices
        14/04/11
        Rescan for new SAN devices can be done using the command

        cfgadm -al

        If a completely new storage system (e.g. Hitache Storage Systems) is added to the SAN, the storage may not be accessible even after using the command above. A relogin of each host bus adapter of the server in

  • 2013
    • October
      • Backup to the disaster site using ZFS Replication
        13/10/27
        ZFS replication can be used to create a backup to the disaster site using a low bandwidth link. The replication is based on ZFS snapshots and only the amount of changed blocks between two snapshots on the filesystem need to be transferred to the disaster site after an initial transfer of all the dat

  • 2012