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In an Xsan, your Metadata is the information about where on the physical disks your files are found, how many pieces they re in, how to assemble those pieces when a client requests a file, and which clients have those files locked for writing. Metadata should be stored on a dedicated Fibre Channel LUN (logical unit number, which each logical segmentation of a target storage device has to uniquely identify it within the target storage). It is very important that it live on a mirrored RAID set, to lessen the risk of it being lost. Xsan storage is broken down into three parts: LUN: Logical Unit Number . A logical grouping of drives into a single entity. Usually a RAID set, but it could be a single drive. Storage pool: A group of LUNs. Each client can write to multiple LUNs through a single storage pool. Volumes: The logical volume presented to the client. It appears as a single local drive. Metadata is then managed by a metadata controller, which determines where data will go on the SAN and keeps track of where each slice of the data resides (similar to a file allocation table). Each volume should have two metadata controllers, a primary and a secondary. While you can have multiple metadata controllers, only one is ever active (per volume) at a given time. Each SAN client requires full access to all LUNs in order to write data. The metadata is simply a pointer that tells the SAN where to write data. If any of the LUNs that make up a storage pool cannot be seen over the Fibre Channel network by a metadata controller or a client, the storage pool reports STRIPE GROUP DOWN, and your Xsan volume will go down. For example, if you were to unplug the cable for one target, you would likely bring an entire Xsan environment down. Therefore, physical security becomes very important with Xsan environments. NOTE: If you are just using Xsan as a back-end file system for a number of bridgehead file servers then you can restrict access to the LUNs to only the WWNNs of the metadata controllers and file servers. The root user of any workstation that is connected through Fibre Channel to an Xsan environment can write directly to any accessible LUNs by writing data into /dev/<LUN>. A common path might be /dev/rdisk4. The association between and device ID and a LUN can be found in the Xsan labels for each LUN. If you write enough arbitrary data into the metadata LUN, then you will cause a volume to become inaccessible. This can be dangerous, because once the Xsan environment is restarted, it will read an invalid amount of data about itself, and therefore be unable to mount the volume. This is a denial of service attack and a tampering attack on the SAN that can be initiated by any client system that has a valid admin/root account. This is very dangerous, and there is

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To get started with the Blog module, you need to assign the Edit Own Blog permission to the user roles that should be able to maintain individual blogs. Users with the proper permissions can then create new blog entries using the create content personal blog entry link. As with all other Drupal content, you can categorize blogs (with the Taxonomy module). Additionally, blogs can have file uploads (thanks to the Upload module), store revision history, be promoted to the front page, and have comments. 2 details these configuration settings. The blogging experience can be enhanced further with the help of a number of contributed modules and external tools. The BlogAPI module, described in the next section, allows users to post to their blogs using popular desktop tools such as ecto (http://ecto.kung-foo.tv/), w.bloggar (http://www.wbloggar.com/), and iBlog (http://www.iblog.com/home.php). In addition, the following contributed modules enhance the blog module s functionality: TrackBack support (a method of notification about the citation or referencing of blog posts between web sites) can be added by installing the TrackBack module: http:// drupal.org/project/trackback. Every blog can have a different theme with the Blog Theme module: http://drupal.org/ node/19248. Blogroll functionality (for managing lists of links to other blogs and sites) is added with the Blogroll module: http://drupal.org/project/blogroll.

If you have numeric values in a column, it is possible to aggregate them as a summation. The ideal scenario for this is to aggregate the number of transactions in a bank account to see how much the balance has changed by. This could be daily, weekly, monthly, or over any time period required. A negative amount would show that more has been taken out of the account than put in, for example.

Every Apple computer comes with a utility to manage Apple AirPorts. This means that every Mac on your network has the ability to configure your AirPorts, which can be dangerous. Now imagine if every Apple computer on the Internet were able to configure your AirPort. If you select Allow configuration over Ethernet WAN port (see Figure 12 16), this is exactly what you are allowing. Do not use this feature unless you really must use it. If it is absolutely necessary to allow administration over the Ethernet, make sure to put an administrative password on the AirPort and give the password only to those who absolutely need it.

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As usual, add the following code behind Default.aspx.cs: using using using using using using using using using using using using System; System.Data; System.Configuration; System.Collections; System.Web; System.Web.Security; System.Web.UI; System.Web.UI.WebControls; System.Web.UI.WebControls.WebParts; System.Web.UI.HtmlControls; System.Data.SqlClient; Microsoft.Reporting.WebForms;