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Measure IOPs in Unix/Linux

http://www.refmanual.com/2012/11/16/measure-unix-iops/

IOPS = (MBps Throughput / KB per IO) * 1024 Or MBps = (IOPS * KB per IO) / 1024

CentOS/RHEL 6 virtualized guest tuning

1.yum install tuned tuned-utils

2. tuned-adm profile virtual-guest

3. dd if=/dev/zero of=tmpfile bs=1M count=1000

See the tables below :

Profile explanation :

default The default power-saving profile. This is the most basic power-saving profile. It enables only the disk and CPU plug-ins. Note that this is not the same as turning tuned-adm off, where […]

荃灣海濱

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UEFI and Ubuntu

https://help.ubuntu.com/community/UEFI

http://askubuntu.com/questions/221835/installing-ubuntu-on-a-pre-installed-uefi-supported-windows-8-system