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Chapter 8 Administering MFS Disks 8-5
MPEGPS
MPEG Program Stream packet format.
MPEG1SYS
MPEG-1 System Stream packet format.
MPEGTCE
MPEG Thomson Consumer Electronics format. The packetization of this
encapsulation consists of an arbitrary number 130-byte packets.
The mfs diskusg utility is useful in conjunction with mfs df. You can compare the
output of mfs diskusg, the amount of space a file would consume, with the output
of mfs df, which tells you the space available.
The following is an example of the use of diskusg:
In the example above, you obtain the number of 64K blocks consumed by a 1.28 GB
file, encoded at 4 Mb/sec., and encapsulated in MPEGTS format. This is the number
of data blocks, not parity blocks. Using the -v (verbose) option with the same
supplied parameters, you receive:
8.2.3 mfs repair
The mfs repair utility reconstructs data for a failed disk using available parity
information, writing this reconstructed data to a new disk. It can also perform
consistency checks on the MFS, including reclaiming unused blocks, and can be used
to explicitly fail a disk.
You can use mfs repair while the Sun MediaCenter server is running and
delivering video streams, or when the server is halted.
server% mfs diskusg size=1280000000 rate=4000000 format=MPEGTS
20480
server% mfs diskusg -v size=1280000000 rate=4000000 format=MPEGTS
Rate 4000000 erate 4000640 bsize 65536 lbsize 262144 ebsize
250040
Redundancy set size 4 zones 2 size 1280000000
Psize 188 Data drives 24 Parity Drives 6
Data blks 5120 Parity blks 1280
Data disk usage 20480 blks (1342177280)
Parity disk usage 5120 blks (335544320)