Category Archives: Database

DB2 10.5 Enterprise Server Edition – Fixing libaio and libnuma shared library error

Before we dig deep I will provide some details on the environment
IBM DB2 Version – DB2 10.5 ESE
OS – Centos 6.5
Server – VPS 1 GB RAM, 30 GB SSD

After I successfully installed IBM DB2 10.5 server edition and created an instance. I issued db2start command and bam got an error.

>db2start
>db2start: error while loading shared libraries:libaio.so.1: cannot open shared object file: No such file or directory

This error occurs because shared library: libio is missing. The solution is very simple. I logged in as root and installed  the library using the following command

>yum install libaio

After installing libaio library switched identity to db2inst1 and tried to started db2instance and got the second error.

>db2start
>db2start: error while loading shared libraries: libnuma.so.1: cannot open shared object file: No such file or directory

Again the reason for this error was missing shared library. I logged in as root and installed the library.

>yum install numactl-2.0.7-8.el6.x86_64

I installed the library and instance started successfully.

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IBM DB2 9 on AIX 5L with NFS, iSCSI, and FCP using IBM System Storage N series

The increasing demand for information has created the need for storage system performance improvements and new performance levels for communications between servers and storage. Two main storage paradigms enable connections between a server and a storage system: network-attached storage (NAS) and storage area networks (SANs).

NAS is data storage that is connected to a traditional Ethernet network. Standard protocols make NAS accessible to clients on those networks. The most common NAS solution is the
network file system (NFS). NFS simplifies data transport and reduces the management
complexity of large storage installations.
SANs rely on a set of storage specific transport protocols: iSCSI and FCP. Because iSCSI
uses TCP/IP as its transport, existing IP-based host connections use Ethernet to pass
information. FCP, by contrast, uses Fibre Channel to connect a server and storage.
Currently, Ethernet bandwidth is eclipsing Fibre Channel and the cost of Ethernet is becoming
more affordable than Fibre Channel. One question that has arisen is how NFS and iSCSI
perform in comparison to FCP.

http://www.redbooks.ibm.com/redpapers/pdfs/redp4250.pdf

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