Showing posts from February, 2010

VMware vMA - UK setup

VMware's vMA is an execllet tool for managing ESXi environments and comes as a pre-built Virtual machine (Appliance).

My method of setting it up for the UK, thus my cronjobs run in GMT/BST.

Setup Authentification to vCenter/ESX hosts
sudo vifp addserver <> vifp listservers vifpinit Test it works vicfg-nics -l --vihost
Update vMA
$ sudo vi /etc/vmware/esxupdate/vimaupdate.conf proxy = http:// proxyport = $ sudo vima-update scan $ sudo vima-update update
Setup SSH Keys
$ mkdir ~/.ssh $ vi ~/.ssh/authorized_keys2 $ chmod 700 ~/.ssh/authorized_keys2
Set Time and local
$ sudo mv /etc/localtime /etc/ $ sudo ln -s /usr/share/zoneinfo/Europe/London /etc/localtime $ sudo vi /etc/sysconfig/keyboard KEYTABLE="uk" $ sudo vi /boot/grub/menu.1st title Red Hat Enterprise Linux Server (2.6.18-164.el5) root (hd0,0) kernel /vmlinuz-2.6.18-164.el5 ro root=/dev/VolGroup00/root quiet notsc divider=10 initrd /initrd-2.6.18-164.el5.img…

Scheduled network capture on Windows using Wireshark (tshark.exe)

A customer had an iSCSI issue and was required to capture network packets at a specific time on a Windows 2008 server.

I came up with simple method using Wireshark'stshark.exe and Windows scheduler "AT".

at cmd /c c:\capture.bat

type c:\capture.bat
rem Capture WireShark example
rem Andy Paton
rem WTL
rem use AT to run batch
rem example at 01:50 cmd /c c:\capture.bat

rem debug at issues
rem example at 09:50 /interactive cmd /k c:\capture.bat

rem -a duration:1200 in seconds
rem -B Buffer Size - default is 1Mb
rem -i Interface number - use "tshark.exe -D" to list interface numbers
rem -n don't resolve IP addresses
rem -q Quiet output
rem -w output file
rem capture filter "host "

c:\"Program Files"\Wireshark\tshark -a duration:1200 -B 2 -i 4 -n -q -w c:\network.out host

ZFS Compression Vs Deduplication (dedup)

Been playing with ZFS dedupe for the last two weeks and just wanted to share my findings.  

Setup OpenSolaris build 131
Sun X4200, 2 x Dual Core Opteron 2.6Ghz, 8Gb Ram, 4 x 73Gb SAS 10Krpm

root@osol:~# zfs list
NAME                       USED  AVAIL  REFER  MOUNTPOINT
compress                    72K  66.9G    21K  /compress
dedupe                      72K  66.9G    21K  /dedupe

root@osol:~# zfs set compression=on compress
root@osol:~# zfs set dedup=on dedupe

Wanted to see how much real data would dedupe.

I loaded the my company  project/Software folders, 68,000 files (Visio/PDF/Project/Word/OpenOffice/Excel,ISO's... ) total of 38.9Gb

Load times, copying files from local UFS filesystem to ZFS dataset.

root@osol:/ufs# ptime tar cf - iso projects software | pv | ( cd /dedupe/ ; tar xf - )
real    19:51.930407394
user        5.807881662
sys      1:48.025965013
38.8GB 0:19:51 [33.3MB/s]

root@osol:/ufs# ptime tar cf - iso projects software | pv | ( cd /compress/ ; tar xf - )
real    18:46.5443211…