[#vlsm]: Variable Length Subnet Mask (“VLSM”)

This refers to the process of performing subnetting: breaking down a network into multiple smaller subnets. (See: subnet.) Specifically, VLSM refers to creating subnets with various different prefix lengths.

VLSM is compared to CIDR so often that many people are not aware of any difference, and freely use the term CIDR when they are referring to VLSM. The difference is discussed further in the section about CIDR.

[#veritas]: Veritas

VERITAS, hereby referenced further as Veritas, was a software vendor. PDF file about Veritas WinInstall 2000 notes, “Veritas has a long-standing and successful partnership with Microsoft, and is firmly committed to support Microsoft Windows 2000 now and in its future versions.” The software being discussed, WinInstall 2000, had a licensed version bundled in with Windows 2000. Also, Wikipedia article for “Veritas Volume Manager”: section called “Litigation” notes that “Microsoft once licensed a version of Veritas Volume Manager for Windows 2000”, so this vendor had at least some prominence among technology professionals. It is probably true that Veritas was even able to include a printed flyer bundled in with some version(s) of Microsoft Windows.

One of the key pieces of software that the Veritas name was known for was Backup Exec. Veritas ended up getting bought out by Symantec.

[#vlsmabbr]: VLSM: Variable Length Subnet Mask
See: variable length subnet mask
[#volume]: volume
sound volume

The most commonly used meaning of the word “volume”, even as it relates to computers, is probably related to the loudness of sound.

filesystem volume

The data that keeps track of bits in files. This includes the data of the files themselves, as well as additional filesystem details (like what directory the file is in), and free space. Basically, a volume generally consumes all of the bits of either a device (like a removable floppy drive) or some sort of a “partition”. A short definition, for those familiar with other terms, would be an instance of a filesystem.

Formatting a disk or partition means creating a volume that fills that disk or partition. Volumes are routinely accessed by being assigned a “mount point”. (Some operating systems may assign a “drive letter” to implement a “mount point”.)

The volume implements a system of keeping track of files (and, in modern filesystems, directories/folders, and perhaps other types of objects such as “devices” that can be communicated to by reading and writing to the “device object”). This system is called a filesystem.

RAID volume
A collection of data storage “devices” which are reserved to be used in a RAID instance. Such a “device” may be a non-physical “device” object, such as a filesystem volume (or whatever a “mount point” is assigned to), or it may refer to actual physical data storage devices (such as “hard drives”).
volume of space
The three-dimensional equivilent of two-dimensional area is either space or volume. Space might be more commonly referred to when the space is physically empty, while volume might be more commonly thought of as space that is filled with some type of (often non-gaseous) matter.
[#voodoo]: voodoo (magic)

Using “voodoo”, or “voodoo magic”, refers to trying a process with hopes that desirable results will occur, but without having any real understanding of why those desirable results would occur. For instance: rebooting a device, just hoping that things work better after the reboot, without any real comprehension of why the reboot would fix things other than perhaps having the vague notion that rebooting has been known to fix things before.

This term is also documented by: Jargon File: voodoo (programming) and some of the related terms cross-referenced by the Jargon File.