WinCC OA Archive Group Sizing=============================Increase the max archive group size of existing (EVENT, ALERT) and new archives. The default size of 1GB is really damn small. Think about the max. db_files parameter (each archive file switch creates a new db file). Sizes of 20GB+ is no problem for Oracle. But keep in mind that there are file size limits (RDB Manager does not use Oracle Big-File-Tablespaces). For a block size of 8k the max file size is 32GB.
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Like DSL, Puppy Linux is a small download (less than 100MB) and boots from a live CD. Once you boot the CD, you're up and running with the whole OS and file system loaded into RAM, which means that Puppy isn't always pulling files off the CD. To install to USB flash, use the Puppy universal installer, which can cope with almost any USB flash disk, regardless of whether it's unpartitioned or using the wrong boot flags. However, the downside is that the installation process can be quite complicated. The installer does a good job of trying to explain what's going on, but you will need to know how to work with disks and partitions if the need arises; for example, if the flags are wrong on a partition, the installer will fire up GParted for you to fix it rather than correct the problem automatically.
Puppy has the option of Booting from writable CD or DVD and saving everything back to the CD/DVD. No hard drive or USB drive is needed to save your data or added packages. I have not tried this feature, but it sounds very interesting. This method seems to create an audit trail of everything you do. When the CD/DVD fills up, it copies your current state to new media and continues.One security concern that I have with Puppy is that you boot up as user root. I would prefer booting up as user doggie or fido and using sudo for commands needing root privilege. Ubuntu has implemented their distros in this manner.Kanotix -- developed by Joerg "Kano" Sdhirottke, this distro is somewhat larger (700MB) than the other distros discussed. It is full featured based on Knoppix and Debian-Sid. It contains many of the latest software applications and is optimized for the i586 architecture. It has the backup/restore and persistent home directory features found in Knoppix.In addition, Kanotix comes with a software management tool called Klik that allow for easy persistent installation of additional software applications. The Klik agent is installed and ready to use. Each software package from the Klik website consists of one compressed image file (.cmg). After you download this file (of course you put this in your persistent home directory), all you have to do is click on it to load and execute. Simple. If you want to delete the software package, you delete the one file and you are done. The solution is quite flexible and most of the downloaded applications actually work.
Damn Small Linux (DSL) -- a small (50MB) distro developed by John Andrews and Robert Shingledecker. DSL's backup/restore methods are unique in that the user can specify the files or directories to backup and restore. Once done, backup and restore are done automatically by default. A cheat code is provided to allow you to override this feature. In effect, this cheat code allows you to be pure again. Amen. It's optional to load the entire image into RAM. Needless to say, it's an option that I always select.The DSL philosophy is to start small and add any additional software that you need. To do this there are "extensions" or modules that can be loaded at boot time or when needed. All you have to do is download these extensions to your persistent area and they are there for you use at every boot. Very easy! Actually, you can load extensions at boot with cheat codes or manually after boot.DSL has a very small footprint that can then grow to fill your needs... a great Linux distro.
SLAX -- this distro is based on Slackware, one of the oldest linux distributions. Developed by Thomas Matejicek, it provides scripts (Linux Live Scripts) for others to create their own liveCDs. And, there have been many takers -- STUX, Goblinix, Buffalo and Mutagenix to name a few. Note that many of these hacks provide four-star features, as outlined above. Note: if you like gnome, Mutagenix is a worthy distro.SLAX uses "modules" to load system components and applications. This is all done at boot time. So, it is very easy to add additional persistent applications. This same module methodology is used to backup and restore user data and configurations. Very clever.
The bottom lineThere are many Linux liveCD distros that are not really meant for installation to a hard disk. They can be booted from CD or USB and used as your everyday desktop. They are easy to update, are portable, work on older hardware, are very secure and are great fun. Party on!
DSL, for those of you who don't know it, is one of several "mini-Linux" distributions. Of the set, it's probably the most well thought of since it actually manages to pick a GUI into its goodness and, having turned version 2.0 recently, it's the most mature of the mini-Linuxes.So how small is it? You can run it on as little as a 33 MHz 486 PC with 32 MB of RAM. I know, because I've done it.The site says you can do in as little as 16 MB of RAM and I see no reason not to believe this. At a mere 50 MB of operating system and programs, you can load, and run, DSL off business-card CDs, USB pen drives... whatever. Heck, if it holds more data than a floppy diskette, chances are you can run DSL off it.Don't think that because DSL only takes up 50 MB of space you're getting a bare-bones Linux system with a command line as the only interface and only a handful of utilities for programs. No, you actually get theFluxBox GUI, and pretty much all the basic applications you'll ever need.FluxBox drives some users crazy because it doesn't have a taskbar and start button. If that's you, you can just grab a copy ofIceWM, another small GUI that does include those screen luxuries, and use it instead. For directions on how to do that, visit Steve Litt'sDSL guide.No matter which GUI you end up using, you've got some nice applications to work with.For example, for Web browsing you can either use Firefox, or the far more obscure but amazingly fast Dillo. For word processing, you haveflwriter. If all you need is basic text editing, there's the editor I always use anyway, vim, plus two others. The list goes on and on. Email, ftp, DHCP, the kitchen sink. If it can fit snuggly in with everything else and still total under 50 MB it's in there.If you have more than enough computer to run DSL, you can also use it to add other programs that will never fit into its 50 MB limit likeOpenOffice.org 2.0. If you want, you can use it to install a full-featured, full-sized Debian/Knoppix style Linux on your system.OK, so that's all very nifty, but so far it probably still sounds more like a clever trick than something useful. What takes DSL from the realm of neat toy to useful program is that you can use it as the foundation for a dandy system repair operating system.With programs like Midnight Commander, one of my favorite file and directory toolkits, andBash Burn, a CD Burning application, you can dig into a dead box's hard drive and pull out useful data. For more on the basics of how to do this, may I recommend this older, but still useful, article onusing Knoppix to find lost data in the smoking wreckage of dead machines by Carla Schroder.In short, DSL makes a fine PC rescue system that you can literally keep in your wallet or shirt pocket. And, that my friend, makes DSL one damned useful distribution -- and far from being just a toy.
This article reviews three open source rescue CDs: System Rescue CD,LNX-BBC, andCDlinux. These are all small downloads, ranging from 17 to 110MB, specifically designed to perform system rescue. To test the three, I used a recent AMD Athlon 2400+ machine with 256MB RAM, onboard LAN, and a Nvidia graphics card. The test machine had Windows XP Professional loaded on an NTFS partition on a SATA drive and Centos 4 on an ext3 partition on a PATA drive.
Desktop distros are the current frontier in Linux computing. Sure, there are plenty of bloated distros full of commercial software, but that's overkill. The average home user doesn't need more than Damn Small Linux has to offer, and it's a great starting point for the Linux noob. It helps you get comfortable with the bash shell while still providing a "safe" graphical desktop. The small size of the whole OS makes for easy downloading too, which is good because Damn Small Linux`'s developers are constantly cranking out new versions.
With its small footprint, Feather Linux downloads in just over an hour on a 128Kbps line. It is even possible to download via a 56Kbps modem, making it the ideal emergency LiveCD for almost everyone. Its low resource needs makes it an ideal distro for recycling legacy PCs with modest hardware, even machines with 486-DX100 CPUs or 48MB of memory. There are also activeFeather Linux forums.
First, I stripped all the packages from Knoppix 3.4 that I didn't need - after all, who needs both KOffice and Openoffice.org, and about five window managers? That left me with a 70Mb image, and then I removed all the locale files and documentation I could find. I also changed the standard XFree86 server to the XVesa and XFbdev servers, which are quicker and much smaller. Then I removed /var/lib/dpkg and placed it in a separate .tar.bz2 archive (which can be downloaded for remasters or hard drive installs), and I did the same for /usr/src/linux as well.Next, I started adding some more applications which were mainly non-Debian, such as ABS and Xzgv. I also removed some files which were identical to others, and replaced them with either symlinks or shell scripts (i.e. in the case of grep, egrep and fgrep). After that, it was just a case of cleaning up some remnants of the original Knoppix - I changed the boot image to show the Feather Linux bootup screen, and I also stopped /home/knoppix being overwritten on boot. 2ff7e9595c
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