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The new lab server has arrived
Update: the Oracle Linux memory problem is solved: https://martincarstenbach.wordpress.com/2012/06/13/kernel-uek2-on-oracle-linux-6-2-fixed-lab-server-memory-loss/ As part of an on-going research project I have invested a little bit of money towards a new lab server. Sadly my Phenom II X6 with 16GB RAM was not on the HCL for ESXi 5 which I required. Before I knew that ESXi can itself be virtualised…
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Performance testing with Virident PCIe SCM
Thanks to the kind introduction from Kevin Closson I was given the opportunity to benchmark the Virident PCIe flash cards. I have written a little review of the testing conducted, mainly using SLOB. To my great surprise Virident gave me access to a Westmere-EP system running a top of the line 2s12c24t system with lots…
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OT: I want this (WordPress) theme
Apologies for a completely non-technical blog item – feel free to skip! However, if you have used a Mac SE like I have, running on System 6, then you’d love this WordPress theme I just discovered: Unfortunately I can’t use it as most of the source code I’m posting is too wide. I can almost hear…
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NIC confusion when cloning virtual machines in ESX5i
A few twitter posts have already indicated that I have a new machine in my study-a Supermicro server with the H8DGi6-F motherboard, 2 12-core AMD 6238 processors and 32 GB RAM. And since I have been given a vSphere 5 Enterprise Plus license, what better to test than this combination! I have to say the…
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Little things I didn’t know: difference between _enable_NUMA_support and numactl
In preparation for a research project and potential UKOUG conference papers I am researching the effect of NUMA on x86 systems. NUMA is one of the key features to understand in modern computer organisation, and I recommend reading “Computer Architecture, Fifth Edition: A Quantitative Approach” from Hennessy and Patterson (make sure you grab the 5th edition).…
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Limit nmon to certain disks
I am often working on systems with large number of LUNs, going into the hundreds. Trying to keep track is difficult at best. Sometimes though you might want to limit yourself to a specific number of disks-I knew about the dskfilt option in collectl but only today learned about a similar feature in nmon. The…
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RMAN restore spfile from autobackup and compatible weirdness
Prompted by a recent interview I wanted to perform a little test with RMAN, and incrementally updated backups. I created a 11.2.0.2.5 database on my Linux (OEL 5.5) test system and refreshed my understanding of this most useful rman feature (which is for another post). So after I was happy with the working of the…
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WARNING: FAILED to load library: /opt/oracle/extapi/64/asm/orcl/1/libasm.so
This post is long overdue, and it’s as much a reminder to myself as it is a post for you to find when scratching your head. Here’s the situation: Oracle Restart on an Oracle Enterprise Linux 5.5 system with ASMLib in use. I have installed 11.2.0.2 plus the latest PSU to bring database and Grid…
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Exadata experience, what does that actually mean?
As an active member of the Oracle user community I really enjoy talking to delegates at user conferences and user group meetings. As such I was very lucky having had the opportunity to attend two of them recently. I have written about the OUGN spring conference in the post before this, and I also enjoyed…
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