On Tue May 28 2002 05:09, Bartho Saaiman wrote:
>I have a problem where my dumper is slow and the taper seems to be
> faster:
>
>
>STATISTICS:
> Total Full Daily
> -------- -------- --------
>Estimate Time (hrs:min) 0:02
>Run Time (hrs:min) 11:21
>Dump Time (hrs:min) 9:42 9:42 0:00
>Output Size (meg) 14818.3 14818.3 0.0
>Original Size (meg) 20804.7 20804.7 0.0
>Avg Compressed Size (%) 71.2 71.2 --
>Filesystems Dumped 1 1 0
>Avg Dump Rate (k/s) 434.8 434.8 --
>
>Tape Time (hrs:min) 1:37 1:37 0:00
>Tape Size (meg) 14818.4 14818.4 0.0
>Tape Used (%) 74.1 74.1 0.0
>Filesystems Taped 1 1 0
>Avg Tp Write Rate (k/s) 2606.1 2606.1 --
>
>Is there a way of changing this to speedup backups.
Not knowing what equipment you have, its a bit difficult to be 100%
precise.
However, in most cases, the speed of the drive itself will be the
overriding consideration of how long it takes to backup 14
gigabytes. To use my own DDS2 drive and its about 390k/second
speed, 14 gigabytes would take nominally 10 hours, plus whatever
time the compression utility itself took. Your drive seems to
indicate its doing 434k/second, slightly faster than mine. so
you're doing it marginally faster.
However, to gain meaningfull speed over this will take a bit of
money to buy a drive thats faster. I'll make no recommendations as
I've never used anything else except a travan TR-4, which wasn't
that different in speed, only dependability, it didn't have any,
and tape life was much less than my dat drive too. I had to
replace a tape in my tape pool this morning, one that had been in
continuous service for over 2 years, first on a 12 tape cycle, and
upped to a 28 tape cycle about 6 months ago. I'm told thats quite
good life for a DDS2, but thats been my experience here. Its also
not germain to your question, just an observation I make.
But I would invite the rest of the group with obviously faster
drives than mine to throw their recommendations, based on real
world useage experience, on the table for you to decide whats the
best dollar buy in terms of operating bandwidth and storage
capacity (and media costs too of course since some formats need
>$50 tapes!).
So sound off folks.
Whats your favorite drive?
How big is its maximum tape? (Capacity in Gb please)
How fast is it?
What did it cost?
and finally, what do the tapes cost?
--
Cheers, Gene
AMD K6-III@500mhz 320M
Athlon1600XP@1400mhz 512M
99.25% setiathome rank, not too shabby for a WV hillbilly
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Copyright 2003 by Maurice Eugene Heskett, all rights reserved.
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