Re: Ontape being really, really, really SLOW...
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I think you should check the block factors both in the OnLine
configuration and in your AIX configuration.
Informix OnlIne:
if the TAPEBLK configuration parameter in the $ONCONFIG file is the
standard 16 kb you can gain much more speed by setting this parameter to
a higher value - try 64 or 128 kb.
(If (when) you change this parameter, be sure to make a new level 0
archive!).
AIX:
Check the block size with the tctl command (assuming the tape drive is
rmt1):
# tctl -f /dev/rmt1 status
If the block_size is 0, then you can read all tapes regardless of the
block size the tape was written with, but with a very slow speed. You
should change the block size with the following command:
# chdev -l rmt1 -a block_size=1024
Note that when you set block_size different from 0, the block_size must
be set to the same value when writing and reading the tape.
best regards
claus
Mr Cheuk Kong Lo wrote:
> It's because of the "5GB 8mm tape", they are dog-slow, a max. thru'put
>
> of not gt 1MB/sec.
>
> But if you mean restore is running A LOT slower, it could mean a bad
> tape/tape drive...Try cleaning first...
>
> Chris
>
> Narkinsky, Pat (Pat.Narkinsky@rivhs.com) wrote:
>
> : Running Informix 7.24UC5, Aix 4.3.0, RS/6000 P20. Tape drive is
> listed as
> : '5GB 8mm tape' and is an IBM (sorry I don't have more complete info)
> .
>
> : Using ontape to backup this system, the backup process takes around
> 2 hours
> : for ~5GB of data. Currently, the restore is running at over 24 with
> no end
> : in site. Near as I can tell, the system is just taking its time and
> not
> : pushing the hardware very hard. Unfortunately, I am probably going
> to have
> : to restore this database a number of times over the next couple of
> weeks.
> : Does anyone have ANY suggestions on ways to speed up the restore? I
> have
> : disk space available if that will help, but my impression has been
> that it
> : likely would not.
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