ndmpstat [tapes] [interval [count]]
The ndmpstat utility reports Network Data Management Protocol (NDMP) statistics, among which are NDMP worker threads, disk IO, tape IO, files operation, performance, and backup activity.
ndmpstat reports the aggregate statistics for all tapes and disks. In order to obtain statistics for specific tape devices, the tape device name should be passed as argument to the utility.
When invoked, ndmpstat begins its display with a one-line summary of the NDMP daemon activity since the NDMP service was invoked.
The fields in ndmpstat output are described as follows:
Report the number of worker threads in each of the four following states:
the number of worker threads running
the number of blocked worker threads that are waiting for resources such as I/O and paging
the number of backup operations currently running
the number of restore operations currently running
Report on usage of filesystem.
the number of files being read
the number of files being written
Report the number of disk operations per interval.
the number of disk blocks being read
the number of disk blocks being written
Report the number of tape operations per interval. There are slots for up to four tapes, labeled with a single number. The number indicates the name of the device under /dev/rmt.
the number of tape blocks being read
the number of tape blocks being written
Report the number of bytes transferred. This is the aggregate value of both tape and disk devices. The number is in kilobytes.
the number of kilobytes being read
the number of kilobytes being written
Displays a rough estimate of performance of the backup/restore operation in megabytes per second.
Display the comparative usage of resources, in percent.
disk I/O time
tape I/O time
other time (memory or idle)
The following operands are supported:
Specifies the number of times that the statistics display is repeated.
Specifies which tapes are to be given priority in the output. A command line is limited to a maximum of four tape devices. A common tape name is /dev/rmt/n, where n is an integer.
Specifies the number of seconds over which ndmpstat summarizes activity. The specified interval remains in effect till the command is terminated.
The following command displays a summary of NDMP daemon activity at five-second intervals.
example% ndmpstat 5 wthr file disk tape bytes perf prcnt r w b r rd wr rd wr rd wr rd wr bk rs dsk tpe otr 1 0 3 6 50 9 1250 0 32544 4455 42335 3234 5 4 20 40 40 1 0 0 1 1 0 128 0 0 128 64 64 1 0 0 80 20 1 0 0 1 2 0 128 0 0 0 64 0 1 0 80 0 20 1 0 0 1 1 0 128 0 0 0 64 0 1 0 80 0 20 1 0 0 1 3 0 128 0 0 0 64 0 0 0 80 0 20 1 0 0 1 1 0 128 0 0 128 64 64 1 0 0 80 20 ^C example%
See attributes(5) for descriptions of the following attributes:
Invocation is evolving. Human readable output is unstable.
Performance numbers are not accurate and are rounded up at the MB/sec. boundary.