Grass Valley K2 Summit 3G v.8.0 - Manual (Page 94)

Corrective Actions Possible Causes Problem
Try to re-create the problem.
Identify all the interactions that
affected the system and run all
the same operations as when the
error occurred.
Record/play/stream the same
clips. Investigate the functions
that seem to push the system into
the error state. If you determine
that certain simultaneous
operations cause the problem,
re-order your workflow to avoid
those situations. If you determine
that the problem is only on
certain clips, investigate disk
faults. The following causes can occur on
their own or in combination to
produce the problem:
• Disk oversubscription — This
occurs when requests to the
media disk exceed the disk’s
bandwidth capabilities. This
generally occur in extreme cases
when a combination of
high-bandwidth operations are
taking place, such as jog/shuttle,
record/play on multiple
channels, or streaming multiple
clips.
• High CPU activity in Windows
— This occurs when activities
on the Windows operating
system over-tax the capabilities
of the CPU. This commonly
happens when unsupported
software has been installed that
competes with K2 Summit
system applications. Virus
scanners and screen savers can
cause this type of problem, since
they can start automatically and
consume system resources.
• Encoder overrun — This occurs
when an encoder is flooded with
more data than it can process
within its real-time requirements
for recording.
• Decoder underrun — This
occurs when a decoder is starved
for data and cannot deliver
enough to satisfy real-time
requirements for playout.
• Disk faults — This occurs when
a media disk is severely
fragmented or has a bad blocks
that interfere with some, but not
all, media operations. For
example, a particular clip can be
written on a bad block, so the
problem occurs only on that clip.
Symptoms can include
black video recorded or at
playout, frozen video, slow
performance, or
inconsistent media access.
These symptoms can be
accompanied by StatusPane
messages regarding disk
problems or
overrun/underrun
conditions for encoders,
decoders, or timecode.
94 K2 Summit 3G Production Client Service Manual 02 February 2012
Troubleshooting problems