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Full Discussion: mksysb to tape too slow...
Operating Systems AIX mksysb to tape too slow... Post 302605502 by ppchu99 on Wednesday 7th of March 2012 02:47:55 PM
Old 03-07-2012
mksysb to tape too slow...

had this p520 server connected to a DDS-3 4mm tape drive...

running AIX 7.1 TL01 -- the latest release.

mksysb -i -e /dev/rmt/1 ..tells me only 1% is done after over an hour ...

I had no problems with th hardware and other connections...

tar command to /dev/rmt/1 runs very fast ....

tape block size is default to 512 bytes..

SmilieSmilieSmilie
 

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dds-dd(1)						      General Commands Manual							 dds-dd(1)

NAME
dds-dd - tool to read a dds device. SYNOPSIS
dds-dd [ -f device ] DESCRIPTION
dds-dd reads a dds tape devices (DAT). Every block is read and written to stdout. A tape with unknown block size or blocks of different size can be read. The default device is /dev/rmt0, which may be overridden with the environment variable TAPE, which in turn may be overridden with the -f device option. The device must be a character special file. OPTIONS
-f device Device of the tape archive (default is /dev/rmt0). Must be a character special file connected to a dds tape device. -V,--version Print the version number of mt-dds to stderr and exit immediately. --help print some screens of online help with examples through a pager and exit immediately. EXAMPLES
Example: Read the tape and make a listing: dds-dd | tar ft - Example: Read the tape and make a listing: dds-dd | cpio -it ENVIRONMENT
The environment variable TAPE overrides the default tape device /dev/rmt0. SEE ALSO dds2tar(1), dds2index(1), mt(1), tar(1) HISTORY
This program was created to use it in conjunction with dds2tar. AUTHOR
J"org Weule (weule@cs.uni-duesseldorf.de), Phone +49 211 751409. This software is available at ftp.uni-duesseldorf.de:/pub/unix/apollo 2.4 dds-dd(1)
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