Issen's Tech Blog

I'm ended up in a situations where a IBM Spectrum Protect (ISP) server was lock down with limitation who is allowed to login over SSH. The main reason of this is because the server was connected to a Linux based LDAP environment after the installation of ISP was done. So now did we end up in a situation where we not where able to let the local ISP user account couldn't ssh to itself. And because we couldn't ssh even though localhost to our ISP user (let's call it tsminst1). And I guess I'm not alone with this issue so I guess this could be a create blog post for my Spectrum Protect / TSM friends. First of all if you are using SuSE Linux Enterprise Server 11 you most run minimum SLES 11 Service Pack 4. Here is a quick and dirty how to upgrade your SLES 11 to SP4. For more information please go to following link: https://www.suse.com/support/kb/doc/?id=7016711 Before you start upgrade anything, make sure you backup the ISP database/volhistory and devic...

Today blog will explain how you add a Linux machine(CentOS/RedHat/Fedora) to a Windows Server 2012 Active Directory. NOTE: If you are using Fedora replace yum with dnf instead during this blog article. Before you start to install anything on your Linux machine you need to know following things before you start. REQUIRMENT: NetBIOS Name of your domain (eg MyCorpDomain) Full Qualified Domain Na,e (FQDN) (eg. MyCorpDomain.Com) Name or IP of your Domain Controller Have a Domain Admin Account BEFORE YOU START: Make sure you have update your Linux first # yum update INSTALLATION: Login as root or use sudo to be able to install following packages. Depending on how your system are setup it may install a lot of dependency’s # yum install sssd realmd ntp ntpupdate samba samba-common oddjob, oddjob-mkhomedir NTP CONFIGURATION: Before you start make sure you have setup Network Time Protocal first (ntp) A basic intro is to verify /etc/ntp.conf and that...

Very few time but it's happened that you need to move a filesystem from one Disk system to another Disk system in IBM Spectrum Scale (GPFS). And here is a little how to how to move a filesystem from one disk to another. Basic overview ·         Create the new disks in Linux ·         Create a NSD on the new disks ·         Add the new NSD to the file system ·         Remove the old NSDs and let Spectrum Scale to migrate the data automatic. ·         Delete the NSDs ·         Delete the Disks in Linux So let's start with Scanning the SCSI bus for new Disks on all NSD Servers [root@server01~] echo "- - -" > /sys/class/scsi_host/hostX/scan    Replace the X with the correct SCSI Host adapter. Create a NSD Stanza file...

I had an  interesting   scenario  where the customer had a Hadoop Cluster based on HortonWorks. They had multi PB large HDFS cluster that have done a lot of great work for them, but the amount of data they pushed in daily in to the cluster and how much hardware they needed to buy to fit all data, was not cost effective for them. They run daily batch jobs and not real-time analytic, that mean they only need a sort of amount of CPU and memory capacity to be able to process all the new data that comes in. But they keep the old data to be able to get much better analytic result. When you read a standard Hadoop design are you recommended to run local disk on a server and then run multiple copies of each file to be able to secure and get a better performance then what a single SATA disk can produce. But this recommendation is because Hadoop was designed to run on cheap server hardware to play with. It's not until now when Hadoop get accepted and runs in to large ente...