iostats(4) [plan9 man page]

IOSTATS(4)						     Kernel Interfaces Manual							IOSTATS(4)

NAME

       iostats - file system to measure I/O

SYNOPSIS

       iostats cmd [ args...  ]

DESCRIPTION

       Iostats is a user-level file server that interposes itself between a program and the regular file server, which allows it to gather statis-
       tics of file system use at the level of the Plan 9 file system protocol, 9P.  After a program exits a report is printed on standard error.

       The report consists of three sections.  The first section reports the amount of user data in read and write messages sent  by  the  program
       and  the  average  rate	at which the data was transferred.  The protocol line reports the amount of data sent as message headers, that is,
       protocol overhead.  The rpc line reports the total number of file system transactions.

       The second section gives the number of messages, the fastest, slowest, and average turn around time and the amount of  data  involved  with
       each 9P message type.  The final section gives an I/O summary for each file used by the program in terms of opens, reads and writes.

SOURCE

       /sys/src/cmd/iostats

BUGS

       Poor clock resolution means that large amounts of I/O must be done to get accurate rate figures.

       Can be fooled by programs that do fresh mounts outside its purview.

																	IOSTATS(4)

KFS(4)							     Kernel Interfaces Manual							    KFS(4)

NAME

       kfs - disk file system

SYNOPSIS

       disk/kfs [ -rc ] [ -b n ] [ -f file ] [ -n name ] [ -s ]

DESCRIPTION

       Kfs  is	a  local user-level file server for a Plan 9 terminal with a disk.  It maintains a hierarchical Plan 9 file system on the disk and
       offers 9P (see intro(5)) access to it.  Kfs begins by checking the file system for consistency, rebuilding the free  list,  and	placing  a
       file descriptor in /srv/name, where name is the service name (default kfs).  If the file system is inconsistent, the user is asked for per-
       mission to ream (q.v.)  the disk.  The file system is not checked if it is reamed.

       The options are

       b n    If the file system is reamed, use n byte blocks.	Larger blocks make the file system faster and less space efficient.  1024 and 4096
	      are good choices.  N must be a multiple of 512.

       c      Do not check the file system.

       f file Use file as the disk.  The default is /dev/sd0fs.

       n name Use kfs.name as the name of the service.

       r      Ream the file system, erasing all of the old data and adding all blocks to the free list.

       s      Post file descriptor zero in /srv/service and read and write protocol messages on file descriptor one.

EXAMPLES

       Create a file system with service name kfs.local and mount it on /n/kfs.

	      % kfs -rb4096 -nlocal
	      % mount -c /srv/kfs.local /n/kfs

FILES

       /dev/sd0fs
	      Default file holding blocks.

SOURCE

       /sys/src/cmd/disk/kfs

SEE ALSO

       kfscmd(8), mkfs(8), prep(8), wren(3)

																	    KFS(4)