These days, a customer’s Oracle Clusterware (2 nodes) crashed one ASM instance at every startup. More Facts: It was not possible to start it manually, too. The CSSD was running. For obvious reasons, CRSD did not start. The other ASM instance in the cluster recognized CLUSTER RECONFIGURATION for a short period of time. The ASM […]
Category: Linux / Unix
My experiences with the penguin and his colleagues.
Linux Network bonding – setup guide
After looking up Linux bonding stuff for the thrid time, I planned to write an article aubout it. But there are lots of good blog posts on this, so just click here at unixfoo: Linux Network bonding – setup guide (strange link, I know, but it works) Hope it helps for you next high avaliability […]
Native ZFS for Linux
After long-aking FUSE implemented ZFS on Linux, Lawrence Livermore Labs have released a reimplemented ZFS for native use with a Linux Kernel. See details here: http://github.com/behlendorf/zfs Still have to test it, but I’d daresay, it was time. Good pooling Martin […]
AIX: Avoiding “ORA-27126: unable to lock shared memory segment in core”
Did you ever change lock_sga = true for an Oracle Instance on AIX 5.3, and did see ORA-27126: unable to lock shared memory segment in core IBM AIX RISC System/6000 Error: 1: Not owner in Return? Do the following: # vmo -o v_pinshm v_pinshm = 0 # vmo -o v_pinshm=1 Setting v_pinshm to 1 # […]
Oracle 11gR2 ASM / ACFS: A first benchmark (poorly)
Hi folks, since Oracle 11g Release 2 is out now, I had to test one of the most-missed ASM features: the ASM cluster file system ACFS. My Setup: Two VMware nodes with 2 CPUs and 1,5GB of RAM each Oracle Enterprise Linux 5.3 x86_64 Four virtual cluster disks from the ESX server, 10GB in size […]
Oracle 11g JDBC driver hangs blocked by /dev/random – entropy pool empty
On a headless (=without console) network server, the 11g JDBC driver used for (java) application connect may cause trouble. In my case, it refused to connect to the DB without any error, trace or log entry. It simply hung. After several hours, it connected one time, and freezed again. Remote debugging done by the development […]
Setting ulimit -m in AIX
AIX has its own rules, as I have to discover these days. Coming across ulimit, I found out that smitty configures value A here and value B completely elsewhere. Hardest one so far has been “ulimit -m” (“Specifies the size of physical memory, in number of K bytes.” a user can assign), since I could […]
Single Sign On for Apache 2.2 and Active Directory 2003 R2 with SuSE 10.2, mod_auth_kerb and MIT Kerberos
Hi, this is a small howto out of my needs, suggestions are always welcome! Assumptions for this paper You know and basically follow http://www.grolmsnet.de/kerbtut, but there are some facts missing/wrong. 2003R2 KDC’s are 10.0.0.1 and 10.0.0.2 (DNS: dc1.example.com and dc2.example.com) Kerberos Realm for ADS is ADS.EXAMPLE.COM (upper case required!) Web server (hostname.domain) is webhostname.server.example.com DNS […]
Switch workspace on command line
Sometimes, it’s nice to change the current windowmanager workspace on command line, for example if you desire to start a application exactly HERE or THERE. For KDE you may want to do it with “kstart”. But a tool like kstart might not be available for your windowmanager, so have a look at “wmctrl” as well: […]
Oracle 10g Data warehouse ORION benchmark, size 20TB, 1200MB per second
During the last days, I have had the opportunity to test and benchmark a data warehousing hardware, that’s really fast for its money. It’s not suitable for real/available production, since it depends on disk striping over a bunch of components, but I considered it as a good way to push the limits a bit. Result: […]