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Can you mix single-ended and differential devices on a SCSI subsystem Why or why not?
Wiki User
∙ 12y ago
when differential signaling was first introduced you could not mix se and hvd devices because of the high voltage used in the hvd. since then a new signaling called lvd is used and it will allow you to use a se if you use the lvd/se mode.( p.1008 managing and maintaining your PC 5th edition)
Wiki User
∙ 12y ago
Malyun Hirmoge
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What does SCSI mean in computer terms?
SCSI is an acronym for Small Computer Systems Interface.
Describe the differences between a hardware RAID and a software RAID?
Brief introduction about Hardware RAIDThe hardware-based system manages the RAID subsystem independently from the host and presents to the host only a single disk per RAID array.An example of a Hardware RAID device would be one that connects to a SCSI controller and presents the RAID arrays as a single SCSI drive. An external RAID system moves all RAID handling "intelligence" into a controller located in the external disk subsystem. The whole subsystem is connected to the host via a normal SCSI controller and appears to the host as a single disk.RAID controllers also come in the form of cards that act like a SCSI controller to the operating system but handle all of the actual drive communications themselves. In these cases, you plug the drives into the RAID controller just like you would a SCSI controller, but then you add them to the RAID controller's configuration, and the operating system never knows the difference.Brief introduction about Software RAIDSoftware RAID implements the various RAID levels in the kernel disk (block device) code. It offers the cheapest possible solution, as expensive disk controller cards or hot-swap chassis are not required. Software RAID also works with cheaper IDE disks as well as SCSI disks. With today's fast CPUs, Software RAID performance can excel against Hardware RAID.Difference between hardware raid and software raidObviously, hardware RAID is pricier compared to software RAID, due to the extra hardware that you need to purchase. The hardware is typically expensive, and adds a substantial amount to the cost of the whole system.On the flip side, the cheap software RAID can impair the host computer, which may result in poor performance. This is because it needs to process the data before it is written to disk, to determine where each piece of data should go.The controller in a hardware RAID handles these operations, so that the host processor does not have to. The host processor will simply write the data, just like in a normal hard drive.Tips: The performance hit taken by the system can vary a lot, depending on what type of RAID array you have in use. It could be very minimal, as with the case of a JBOD array. Or it can be quite substantial, especially with stripping and mirroring on multiple disks.Hardware RAID offers better reliability compared to software RAID. A software RAID can be prone to data corruption, due to the fault of the RAID software or driver that is being used. A software RAID can also be affected if the host computer is heavily loaded. Heavy processing can cause some pieces of data to be delayed by a small amount of time. These delays can add up, and negate the benefits of the RAID array to some degree.
What is the primary storage device on the computer?
If you are talking about internal storage, the SCSI drive was the first. However, tape drives were used long before that. Many early computers didn't even have a hard drive, instead the data was simply stored in RAM, and erased after the computer was turned off.
What are computer busses?
Channels of communication on which information is transferred within a computer or between a computer and peripherals. There are far too many to list but some of them are: address, data, control, input/output, PCI, PCIe, ATA, SATA, USB, UNIBUS, S-100, MULTIBUS, FireWire, NUBUS, SCSI, Fibre Channel, EtherNet, GPIB, RS-232, MIL-STD-1553B
Is the standard for communication between a subsystem of peripheral devices and the system bus?
SCSI
What is a standard for communication between a subsystem of peripheral devices and the system bus?
SCSI
Is a standard for communication between a subsystem of peripheral devices and the system bus?
SCSI
What is the standard for communication between a subsystem of peripheral devices and the system bus?
SCSI
Are all SCSI devices compatible with all SCSI ports?
No There are 2 electrical alternatives single ended SE and differential types. VD These cannot be used on the same bus. However a third type low voltage differential LVD can be if the interface card supports it
SCSI bus can support up to how many devices simultaneously?
SCSI, Fast SCSI, Ultra SCSI, Ultra2 SCSI: 8 devices Wide SCSI, Fast Wide SCSI, Ultra Wide SCSI, Wide Ultra2 SCSI, Ultra3 SCSI, Ultra160 and 160+ and Ultra320 : 16 devices Of course, the number of devices supported depends not only on protocol limitations, but cable length, number of cables used, etc.
What are SCSI types that allow for 16 devices including the adapter to be connected on a single shared cable?
Ultra wide SCSI. wide SCSI buses support 16 devices, rather than the eight devices specified in regular SCSI.
How many scsi devices can be attached to a wide scsi host adaper?
16 devices can be connected
What is an accurate number of SCSI devices that can be connected on a SCSI bus including the host adapter?
8 devices:)
How many devices can be used on a single SCSI bus?
8 Devices can be used on a single SCSI bus.
How many scsi devices can be attached to a wide scsi host adapter?
Wide SCSI bus can support up to 16 devices using channels 0-15.
How many devices can be daisy chained on a single standard SCSI controller?
Most modern SCSI buses support a total of 16 devices, while older SCSI implementations usually support only eight devices.
