Test IOPS and disk throughput in Linux
Excellent article on testing IOPS and throughput of Linux disks and filesystems. https://www.linux.com/learn/tutorials/442451-inspecting-disk-io-performance-with-fio
Categories Archives Linux
MegaRAID Storage Manager on Ubuntu for LSI cards
Getting MegaRAID Storage Manager and CLI tools installed on Ubuntu is no fun.
Using badblocks to test and wipe disks
Non destructive (read only) test, optimized for 1G RAM: badblocks -b 4096 -c 98304 -p 0 -s /dev/sda Destructive read/write test (use caution!): badblocks -b 4096 -c 98304 -p 0 -w -s /dev/sda
Dropped VIF TX Packets on XenServer 5.6
On multiple XenServer 5.x setups I’ve been experiencing dropped packets evident as light to medium packet loss on a busy DomU. It only affects heavy network loads on DomU’s and not Dom0. It also doesn’t seem to care about what OS is running; I’m seeing it in Debian, CentOS, and Windows. Since I manage streaming […]
Mcelog – Bad memory?
The original hardware did all kinds of strange things, stuff like SSH not working and RPM checksums failing, random rebooting, ect. I ended up swapping the chassis, mainboard and RAM but kept the HDD’s to avoid an OS reinstall. Now, I’ve gotten this twice on the new box followed by a hard freeze about 2 […]
Quick and easy Icecast KH upgrade
cd /usr/src && wget http://www.xiphicecast.webspace.virginmedia.com/icecast-2.3.2-kh29.tar.gz tar -zxf icecast-2.3.2-kh29.tar.gz && cd icecast-2.3.2-kh29 ./configure;make CFLAGS=”-D_XOPEN_SOURCE=600″ && make install
Installing Subversion on Cpanel/WHM
Make and install Subversion: mkdir -p /usr/local/src/ wget http://subversion.tigris.org/downloads/subversion-1.5.2.tar.bz2 tar xfj subversion-1.5.2.tar.bz2 && cd subversion-1.5.2 ./configure –with-apxs=/usr/local/apache/bin/apxs –with-apr=/usr/local/apache/bin/apr-1-config –with-apr-util=/home/cpeasyapache/src/httpd-2.2.17/srclib/apr-util make && make install Add to pre-main include in Apache Configuration (WHM): LoadModule dav_svn_module modules/mod_dav_svn.so LoadModule authz_svn_module modules/mod_authz_svn.so Set up EasyApache’s per-user virtualhost config directories (if not present): mkdir /etc/httpd/conf/userdata mkdir /etc/httpd/conf/userdata/std mkdir /etc/httpd/conf/userdata/std/2 Add a […]
Service control on debian/ubuntu from command line
Use sysvconfig: apt-get install sysvconfig
Cpanel: Force backup run
When setting up a new server or finishing a migration, it’s a good idea to force a backup run: /scripts/cpbackup –force
Sample Debian/Ubuntu Interfaces File
/etc/network/interfaces # The loopback network interface auto lo iface lo inet loopback # The primary network interface allow-hotplug eth0 auto eth0 iface eth0 inet static address 208.85.x.x netmask 255.255.255.x gateway 208.85.x.x auto eth0:1 iface eth0:1 inet static address 208.85.x.x netmask 255.255.255.x