...................Linux

When I was demonstrating LVM thin provisioning to new batch of campus hires ; they pointed out an important mismatch between thin pool usage and actual file system usage. I thought , it would be worthy to give it a try to find the cause. So here we go; I created a thin pool with size of 100MB and thin volume of 1GB Thin volume formatted with ext4 and mounted over /test_fs Everything was going smooth as per the plan until we did a tar backup of /usr over /test_fs. Here we go ; * Created vg001 - size 12GB [root@ol7-san ~]# vgdisplay vg001   --- Volume group ---   VG Name               vg001   System ID   Format                lvm2   Metadata Areas        1   Metadata Sequence No  12   VG Access             read/write   VG Status             resizable   MAX LV                0   Cur LV                0   Open LV               0   Max PV                0   Cur PV                1   Act PV                1   VG Size               12.00 GiB   P

SFTP auto login without keys / without password sftp command doesn't have option to specify password for auto login. Recently faced this issue while writing a script on SUSE Linux for transferring system performance report to a central location, which is also a SuSE system. We can accomplish this with "lftp" or "expect" command, but SLES doesn't install those binaries default. I've to live with what I got, so let’s try how we can accomplish this with sftp command. The idea is 1.Set "SSH_ASKPASS" environment variable and force "sftp" command to read password from there. 2."sftp" will always ask password if its executing from a terminal, so we need to daemonize sftp command with "setsid" command Below code snippets will give some idea how we get it to the solution pathnames.h /* Default path to ASKPASS program */ #define _PATH_SSH_ASKPASS_DEFAULT   "/usr/X11R6/bin/ssh-askpass" ssh

ReaR – Relax and Recover is an Opensource tool for backing up your OS. The Physical to Virtual and Virtual to Physical migration of OS is also possible with ReaR You can also integrate your favorite backup tools like IBM TSM or HP Data Protector with ReaR to backup the OS to External Storage Here is the setup I used OS :openSuSE 11.4 ReaR package: rear-1.10.0-23.1.noarch Pre-requisites 1:                 RPMs mingetty binutils iputils tar gzip ethtool syslinux iproute2 lsb genisoimage nfs-client rpcbind rpmlib(PayloadFilesHavePrefix) <= 4.0-1 rpmlib(CompressedFileNames) <= 3.0.4-1 /bin/bash rpmlib(PayloadIsLzma) <= 4.4.6-1 Pre-requisite 2:                 NFS server ( I used RHEL5 )with a share /rear/backup and the share must have write permission                 /etc/exports                 /rear/backup      *(rw,no_root_squash)                 service nfs start                 showmount –e                 -

You can exit the cosole of an LPAR ,that has been taken using HMC vtmenu ,by typing "~." (press dot key after tild without qoutes ) If you had taken HMC vtmenu using SSH ,your ssh connection to HMC will alse loses.

1.vi /etc/tftpaccess.ctl allow:/tftpboot Save the file You are done..!!! Now the clients can only access /tftpboot using TFTP

1. vi /etc/ftpaccess.ctl herald: /path/to/banner/file ---->Enter your welcome message in this file motd: on 2. refresh -s inted You are done