Bosch Appliances DVAS instruction manual Network Statistics, Bad Blocks

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7.9 Network Statistics

This page provides information about the network link. If you are having problems with the network, this page may be helpful.

Figure 24 Network Statistics

Available Information:

Information	Description
Collisions	Counter of packet collisions when two network
	devices transmit at the same time.
FIFO errors	Counter of DMA (Direct Memory Access)
	transfer errors when loading the FIFO (First In
	First Out buffer) on the Network IC.
Carrier errors	Counter of errors from the data carrier signal
	due to being outside the limits or lost during
	transfer.
Window errors	Counter of times the Network IC runs out of
	FIFO space.
Overflow errors	Counter of times the Network IC runs out of
	FIFO space.
Length errors	Counter of packets less than 64bytes or greater
	than 1518bytes.
CRC errors	Counter of packets with bad CRC (cyclic
	redundancy check); count increases when a
	packet containing corrupt data is received.
Frame errors	Counter of frame alignment errors caused by a
	frame without the correct number of bytes, but
	still within the length limit.

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7.10 Bad Blocks

Bad blocks are sections of the disk that data can no longer be read from or written to. A DVAS array automatically remaps single bad blocks to a spare blocks portion of the disk when using a parity- protected RAID level. However, if two bad blocks are discovered at once, that block of data is lost. This is most likely to happen during a rebuild, or when one disk is missing and another disk has a media error. In general, bad blocks are unlikely to occur.

This page shows the number of bad blocks for each drive. If there are bad blocks present, their location can be viewed by clicking Details (in the right-hand column).

Figure 25 Bad Blocks

Bosch Security Systems 20 January 2004