Fibre Channel fabric Fibre Channel zoning Registered state change notification
Layer 1. Data link
Fibre Channel 8b/10b encoding
Layer 0. Physical
Logical Unit Number Masking or LUN masking is an authorization process that makes a Logical Unit Number available to some hosts and unavailable to other hosts.
LUN Masking is a level of security that makes a LUN available to only selected hosts and unavailable to all others. This kind of security is done on the SAN level and is based on the host HBA, i.e. you can give access of specific LUN on the SAN to specific host with specific HBA.
LUN masking is mainly implemented at the host bus adapter (HBA) level. The security benefits of LUN masking implemented at HBAs are limited, since with many HBAs it is possible to forge source addresses (WWNs/MACs/IPs) and compromise the access. Many storage controllers also support LUN masking. When LUN masking is implemented at the storage controller level, the controller itself enforces the access policies to the device and as a result it is more secure. However, it is mainly implemented not as a security measure per se, but rather as a protection against misbehaving servers which may corrupt disks belonging to other servers. For example, Windows servers attached to a SAN will, under some conditions, corrupt non-Windows (Unix, Linux, NetWare) volumes on the SAN by attempting to write Windows volume labels to them. By hiding the other LUNs from the Windows server, this can be prevented, since the Windows server does not even realize the other LUNs exist.
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In computer storage, a logicalunitnumber, or LUN, is a number used to identify a logicalunit, which is a device addressed by the SCSI protocol or by...
original pattern was set. This is often called bit masking. (By analogy, the use of masking tape covers, or masks, portions that should not be altered or portions...
evenly; if the only factor left is 1, the original number was a power of 2. Using bit and logical operators, there is a simple expression which will return...
(IOLENGTH=length) olist As an example LOGICAL :: ex, op CHARACTER (LEN=11) :: nam, acc, seq, frm INTEGER :: irec, nr INQUIRE (UNIT=2, EXIST=ex, OPENED=op, NAME=nam...
least-significant portion of a redundantly represented number to non-redundant form. This allows operations such as masking off the low k bits can be done in log(k)...
studied "linguistic masking". The "masking" of quantitative relationships takes three main forms: masking plain computational error; masking through a categorization...
the values of the variables are numbers. Second, Boolean algebra uses logical operators such as conjunction (and) denoted as ∧, disjunction (or) denoted...
A memory management unit (MMU), sometimes called paged memory management unit (PMMU), is a computer hardware unit that examines all memory references...
be some further adjustments between a "physical" pixel and an on-screen logical pixel. As screens are viewed at difference distances (consider a phone...
LTR—Left-to-Right LUG—Linux User Group LUN—LogicalUnitNumber LV—Logical Volume LVD—Low Voltage Differential LVM—Logical Volume Management LZW—Lempel-Ziv-Welch...
data between the CPU and memory, while the latter performs arithmetic and logical operations on data. Without a significant amount of memory, a computer...
of 4-bit pixels. Manipulating packed pixels requires extra shifting and masking operations on the CPU. Blitters were developed to offload repetitive tasks...
if the logical sectors entry at offset 0x013 is zero. A simple formula translates a volume's given cluster number CN to a logical sector number LSN: Determine...
half-duplex. Transmitted signal levels are 0.0–0.3 V for logical low, and 2.8–3.6 V for logical high level. The signal lines are not terminated. High speed...
virtual memory system in most modern operating systems reserves a block of logical memory around address 0 as unusable. This means that, for example, a pointer...
even partition on that storage device, has a logicalunitnumber (LUN) assigned to it. This is a unique number within the SAN. Every node in the SAN, be...
properly refers to the pixel density, the number of pixels per unit distance or area, not the total number of pixels. In digital measurement, the display...
to become a soft error are electrical masking, logicalmasking, and temporal (or timing-window) masking. An SEU is logically masked if its propagation...
{\displaystyle K} is a 256-bit number and F {\displaystyle F} is a 128-bit number. Encrypting block P {\displaystyle P} with logical index (tweak) I {\displaystyle...
spaces, which contain no executable code. A machine may be divided into Logical Partitions (LPARs), each with its own virtual system memory so that multiple...
(hyperthreading) layer, and return 2 in EBX because there are two logical processors (SMT units) per physical core. The value returned in EAX for this 0-subleaf...
the bit and sbit functions and an extensive number of logical operations is supported. Arithmetic logic unit Binary code Binary numeral system Bitboard...
EPROM programmer. This unit uses the Multibus card cage which was intended just for the development system. A surprising number of spare card cages and...
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