01-19-2006
Slow Backup
Dear Gurus,
I am experincing very slow backup on a DLT 8000 tape drive.
Knowing that the transfer rate of this tape is 6 MB/s, we have a write rate of 4 MB/s, no waits, average service time about 25 % and the disaster 99 % busy percentage.
uname -a
SunOS DCHQINTA1 5.9 Generic_118558-06 sun4u sparc SUNW,Sun-Fire-480R
iostat -xdnz 10 30:
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.1 0.9 0.8 5.6 0.0 0.0 0.0 1.2 0 0 c4t1d0
0.0 2.1 0.0 10.0 0.0 0.0 0.0 0.7 0 0 c4t0d1
0.0 1.3 0.0 10.4 0.0 0.0 0.0 0.7 0 0 c4t0d3
36.2 0.2 3988.0 0.8 0.0 0.2 0.0 5.0 0 5 c4t1d2
0.0 5.0 0.0 31.1 0.0 0.0 0.0 6.8 0 2 c1t0d0
0.0 41.8 0.0 4012.8 0.0 1.0 0.0 23.8 0 99 rmt/0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 0.7 0.0 3.0 0.0 0.0 0.0 6.3 0 0 c4t1d0
0.0 1.7 0.0 7.6 0.0 0.0 0.0 0.5 0 0 c4t0d1
0.1 1.3 0.8 9.7 0.0 0.0 0.0 1.1 0 0 c4t0d3
37.2 0.1 4094.4 0.1 0.0 0.2 0.0 5.4 0 5 c4t1d2
0.0 16.6 0.0 123.9 0.0 0.2 0.0 9.5 0 9 c1t0d0
0.0 41.9 0.0 4022.4 0.0 1.0 0.0 23.7 0 99 rmt/0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 6.3 0.0 16.0 0.0 0.0 0.0 1.1 0 0 c4t1d0
0.0 2.1 0.0 7.8 0.0 0.0 0.0 0.6 0 0 c4t0d1
0.0 1.8 0.0 13.0 0.0 0.0 0.0 0.7 0 0 c4t0d3
35.8 0.0 3987.2 0.0 0.0 0.2 0.0 5.3 0 4 c4t1d2
0.0 0.7 0.0 1.9 0.0 0.0 0.0 11.0 0 0 c1t0d0
0.0 41.7 0.0 4003.2 0.0 1.0 0.0 23.8 0 99 rmt/0
Any advice, why am i having 99 % busy percentage ?
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LEARN ABOUT OSX
device_maps
device_maps(4) File Formats device_maps(4)
NAME
device_maps - device_maps file
SYNOPSIS
/etc/security/device_maps
DESCRIPTION
The device_maps file contains access control information about each physical device. Each device is represented by a one line entry of the
form:
device-name : device-type : device-list :
where
device-name This is an arbitrary ASCII string naming the physical device. This field contains no embedded white space or non-
printable characters.
device-type This is an arbitrary ASCII string naming the generic device type. This field identifies and groups together devices
of like type. This field contains no embedded white space or non-printable characters.
device-list This is a list of the device special files associated with the physical device. This field contains valid device
special file path names separated by white space.
The device_maps file is an ASCII file that resides in the /etc/security directory.
Lines in device_maps can end with a `' to continue an entry on the next line.
Comments may also be included. A `#' makes a comment of all further text until the next NEWLINE not immediately preceded by a `'.
Leading and trailing blanks are allowed in any of the fields.
The device_maps file must be created by the system administrator before device allocation is enabled.
This file is owned by root, with a group of sys, and a mode of 0644.
EXAMPLES
Example 1: A sample device_maps file
# scsi tape
st1:
rmt:
/dev/rst21 /dev/nrst21 /dev/rst5 /dev/nrst5 /dev/rst13
/dev/nrst13 /dev/rst29 /dev/nrst29 /dev/rmt/1l /dev/rmt/1m
/dev/rmt/1 /dev/rmt/1h /dev/rmt/1u /dev/rmt/1ln /dev/rmt/1mn
/dev/rmt/1n /dev/rmt/1hn /dev/rmt/1un /dev/rmt/1b /dev/rmt/1bn:
FILES
/etc/security/device_maps
SEE ALSO
allocate(1), bsmconv(1M), deallocate(1), dminfo(1M), list_devices(1)
NOTES
The functionality described in this man page is available only if the Basic Security Module (BSM) has been enabled. See bsmconv(1M) for
more information.
SunOS 5.10 16 Jan 2001 device_maps(4)