Archives
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2020
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March
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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
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COVID 19 simulation
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March
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2018
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July
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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
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Solaris 10 Ldap authentication with Windows AD server
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July
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2016
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October
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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
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Clone Pluggable Database using zfs clones
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October
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2015
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December
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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
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ZPOOL hangs during rollback of a zfs snapshot
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July
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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<
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Solaris rescan SCSI device on VMware
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December
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2014
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April
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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
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Solaris rescan SAN devices
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April
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2013
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October
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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
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Backup to the disaster site using ZFS Replication
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October
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2012
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April
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From a CSV-Addresslist to a Fritzbox Phonebook (CSV2Fritzbox)
12/04/08
If you want to convert a CSV-addressbook into a Phonebook for importing into your fritzbox you can use the following script
An example how to use it:
cat adressbook.csv |csv2fritzbox.bash -n 3 -h 9 -o 8 -m 12 -t -d , > fritzboxphonebook
The file fritzboxphonebook
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From a CSV-Addresslist to a Fritzbox Phonebook (CSV2Fritzbox)
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February
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Changing Coordinator Disks online in Veritas Cluster Server (VCS) without vxfenswap
12/02/05
Starting with Veritas Cluster Server 5.0 MP3 there is an official tool "vxfenswap" to change the coordinator disks online. Before there was no such tool and no official statement how to change to coordinator disks while applications could stay online, although there is a simple solution wh
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Changing Coordinator Disks online in Veritas Cluster Server (VCS) without vxfenswap
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January
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VMware and Virtualbox timer causes on Solaris 10 update 8 and later nanosleep to hang for ever
12/01/13
The system call nanosleep uses the system call cv_timedwait_sig to wait. Starting with Solaris 10 update 8 the system call cv_timedwait_sig uses the system call cv_timedwait_sig_hires to wait which then uses gethrtime() to schedule the wake up time. As this high resolution timer can jump on Solaris -
Oracle Database corruption after crashing a VMware Instance running Solaris on a UFS or ZFS Filesystem
12/01/13
When running a Oracle Databases on a UFS or ZFS filesystem on Solaris 10 X86 on VMware virtual machine, the default values of all the stacks involved (Oracle Database, Solaris, VMware) can cause a database corruption, each time the VMware virtual machine is powered off without cleanly shut down the
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VMware and Virtualbox timer causes on Solaris 10 update 8 and later nanosleep to hang for ever
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April