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:

server% mfs diskusg size=1280000000 rate=4000000 format=MPEGTS

20480

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:

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)

8.2.3mfs 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.

Chapter 8 Administering MFS Disks 8-5

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Sun Microsystems 2.1 manual Mfs repair