varsha 
vinay Netapp hammer : Disk & Storage controller stress testing tool
cloudibee Netapp has an disk & loop stress testing command (in advanced mode) to hammer and load test a filer. This hammer script generates huge I/O operations on the disks –…
Netapp nfsstat
How do you check which nfs client uses most of your filer’s nfs operations? . You have to enable the option “nfs.per_client_stats.enable”. This option would give you per nfs operations…
Vmware 2.0 : CLI management utility
Prior to Vmware server 2.0, vmware-cmd was the command line tool for the managements of the virtual machines. In Vmware 2.0, vmware-vim-cmd is the tool that can be used for…
rsyslogd
Rsyslog is an enhanced multi-threaded syslogd system utility providing support for message logging. Support of both internet and unix domain sockets enables this utility to support both local and remote…
Linux : How to get DHCP server name ?
If your linux machine is running on a dhcp enabled network , how do you identify the dhcp server name ? Check out the file /var/run/dhclient-eth0.lease , replace the eth0…
SSHFS
Worried about often copying files to remote machines using ftp or scp ?. Try using fuse-sshfs . You can download the fuse and sshfs rpm from DAG and install it…
Linux : Network tunable parameters
All TCP/IP tunning parameters are located under /proc/sys/net/. Here is a list of some important tuning parameters: /proc/sys/net/core/rmem_default – Receive window size/proc/sys/net/core/wmem_default – Send window size/proc/sys/net/core/rmem_max – Maximum Receive Window/proc/sys/net/core/wmem_max…
mdadm : Software RAID management in Linux
This utility helps to manage software raid devices on Linux. RAID devices are virtual devices created from two or more real block devices. This allows multiple devices to be combined…
AIX Filesystem tips
1) How to view all filesystems on a machine ? “lsfs” is the command to list all the filesystems on a server. Alternatively, you can also view /etc/filesystems. aix23:# lsfs…
Netapp Snapshot: quick guide
Netapp Snapshot technology helps in creating point-in-time copies of file systems, which you can use to protect data—from a single file to a complete disaster recovery solution. You can create…
Linux : CPU hammer script
A Simple script to load & hammer the CPU using awk. The script does mathematical calculations and thus CPU load peaks up on higher values passwd to loadserver.sh . (Tested…
AIX syslog
By default, syslog is not enabled on an AIX system. The default install on an AIX install will not place entry’s in /etc/syslog.conf, leaving it empty. So to make sure…
What is /proc/slabinfo?
/proc/slabinfo gives information about memory usage on the slab level. Linux kernels uses slab pools to manage memory above the page level. Commonly used objects have their own slab pools.…
Ntp daemon in HP-UX
In HPUX, xntpd is the daemon which sets and maintains the system time in synchronism with Internet standard time servers. xntpd reads the /etc/ntp.conf configuration file at startup time in…
/usr/sbin/ss : Socket information utility similar to netstat
In Linux, /usr/sbin/ss commmands gives the socket information similar to netstat. There are various options which are very useful. # /usr/sbin/ssState Recv-Q Send-Q Local Address:Port Peer Address:PortESTAB 0 0 192.12.2.45:1022…