Re: AVg Tape Write Rate

On Wed, 10 Jul 2002 21:49:24 -0400 (EDT)
"Stuart D. Gathman" <[email protected]> wrote:

> If you use GNU tar to do a big enough backup to get a good average (100
> Megs or so), it will spit out average throughput in Kb/sec if you give it
> the "--totals" option.  The output looks like this:
> 
> Total bytes written: 8069570560 (7.5GB, 897kB/s)
> 
> My floppy drive yields 78 Kb/sec.  For comparison, a TR-5 IDE drive gets
> 897 Kb/sec.  The driver by default limits the rate for floppy drives.  If you
> think your floppy interface can do better, then there is a driver parameter to
> speed it up (ft_fdc_rate_limit).  But it can crash the system if the floppy
> interface can't hack it, so sync up first.

Cool!  I didn't realize tar had that option.  You learn something new
everyday, I suppose, and especially using a Unix-based system.

doug@godzuki:~$ tar cf /dev/nqft0 --totals /usr/bin /usr/lib /usr/include
tar: Removing leading `/' from member names
tar: Removing leading `/' from link names
Total bytes written: 57876480 (55MB, 77kB/s)

I'm getting the same results as you.

Pete:  You might want to check-out one of those accelerator boards if this
isn't fast enough for you.  I believe they were supposed to double the
throughput of TR3 drives.

-- 
We Klingons believe as you do -- the sick should die.  Only the strong
should live.
		-- Kras, "Friday's Child", stardate 3497.2
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