Ardent Performance Computing
Linux
Oracle IOPS and HBA Queue Depth
About a month ago I wrote an overview of Linux Caching and I/O Queues as they pertain to Oracle. I was working on a project to architect, install and configure the beginnings of an 8-node cluster consisting of either one or two RAC databases. During the project, while I was waiting for the OS guys … Continue reading
Oracle Clusterware on RHEL5/OEL5 with udev and multipath
The trouble with Linux? No… the trouble with computers in general – is that they keep changing! Solaris 10 comes out, Oracle 11g, Red Hat 5… and everything works different!! It’s a full-time job just trying to keep up with everything. Almost exactly one year ago I wrote about using udev on 2.6 kernels to … Continue reading
Oracle I/O and Operating System Caching
Well it’s been awhile since I’ve written anything for the blog – during the past four months I went on a trip to Asia, celebrated Thanksgiving and Christmas with both my family and my girlfriend’s family and then in January I got engaged! I’ve also been working on some continuing educational goals – so needless … Continue reading
Monitoring Oracle on SMP with Hyper-Threading
So I’ve really been digging Kevin Closson’s blog lately. Back at the beginning of this month he had another post that caught my attention about running Oracle on Opteron in which he made the point that these boxes should always be run in NUMA mode (not SUMA). This grabbed my eye because I’ve been delving … Continue reading
Monitoring Oracle on NFS
Wow – the last three weeks have been crazy! During the last week of May I was wrapping up the services paper and a few submissions for the UKOUG. And for the first two weeks of June I’ve been working on some performance problems for one of our clients in the Phoenix area. Nice weather … Continue reading
Who’s Accessing That File?
From the occasionally-useful-scripts library… It’s like fuser but shows name of the process (args[0]). Needs lsof installed. I’ve used it on Linux and Solaris. nap01:~$ cat jduser #!/bin/sh [ -n “$1” ] && [ -d “$1” ] || { echo “Usage: $0 [dir]”; exit; } AWK=awk; [ “`uname`” = “SunOS” ] && AWK=nawk; lsof +d … Continue reading
The Clusterware C API
Well I’ve been incognito for the past two weeks or so because I’ve been finishing up a pretty detailed paper about Oracle Services. Finally finished up the first draft yesterday… it’s 16 pages in the IEEE Computer Society article LaTeX class – which doesn’t leave much whitespace! It’s a pretty comprehensive review of pretty much … Continue reading
Automating Those Pesky Linux Prerequisites
Was just perusing Sergio Leunissen’s blog this morning and a couple of his recent posts caught my attention: First off, as someone who frequently installs Oracle on Linux, his post last month about the recently released RPM oracle-validated was great – can’t believe I’d missed that. Basically it’s an RPM that makes sure you have … Continue reading
Crazy Networking Problem on Linux
And the saga continues… Tuesday I mentioned a PRKP-1001 from rconfig – however I think that the root cause might have been something quite different from my original suspicion. Yesterday we discovered a rather major issue on the server… when trying to configure EM dbcontrol I started receiving errors indicating that the ports weren’t free. … Continue reading
RAC File Permissions Quick Reference
I was just thinking today about how useful it might be to have a quick reference to permissions on Oracle RAC databases. Can’t tell you how many time I’ve asked “what should the permissions be for this”… so I’m just going to use this post for all the files I can think of and their … Continue reading
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contact: schneider @ ardentperf.com
Ardent Performance Computing 
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