[dba-Tech] why oh why - big copy bursts

Isn't your reply interesting.  See my original message below.

8-)

I
Think
Something
Happened
Between
You
And
Me 


John W. Colby
Colby Consulting
www.ColbyConsulting.com 
-----Original Message-----
From: dba-tech-bounces at databaseadvisors.com
[mailto:dba-tech-bounces at databaseadvisors.com] On Behalf Of Rusty Hammond
Sent: Friday, February 08, 2008 1:40 PM
To: Discussion of Hardware and Software issues
Subject: Re: [dba-Tech] why oh why - big copy bursts

If you can't find a place for them in another system, there's always the
option of buying external usb drive enclosures and using them as backup
drives.  Maybe you have client that could use them on their system(s)?

----- Original Message ----
From: jwcolby <jwcolby at colbyconsulting.com>
To: Discussion of Hardware and Software issues
<dba-tech at databaseadvisors.com>
Sent: Friday, February 8, 2008 11:21:24 AM
Subject: [dba-Tech] why oh why - big copy bursts


I
am
trying
to
copy
a
30
gig
file
from
one
computer
to
another.  
Task
Manager
shows
it
"bursting" 
transmission
at
30-40%
of
network
bandwidth
for
10
or
20
seconds
and
then
transferring
at
3%
or
so
for
10
minutes
or
so.
While
it
is
bursting
it
shows
"will
complete
in
10
minutes",
when
it
trails
off
it
shows
"will
complete
in
160
minutes".  
Obviously
I
want
this
thing
to
finish
so
I
can
copy
the
next
file.

Any
idea
why
I
would
be
seeing
something
like
this?

Actually
I
just
took
a
bathroom
break
and
while
thinking
about
it
I
may
have
come
up
with
the
answer.  
Software
raid
0.  
The
destination
disk
is
a
software
raid
0
drive
using
three
different
drives.  
Perhaps
the
destination
computer
is
caching
a
bunch
of
data
and
then
runs
out
of
room
to
cache
more
while
it
writes
the
data
out
to
the
Raid1
volume.  
Which
would
answer
the
question
of
why
I
would
choose
JBOD
over
RAID0.  
The
write
calculations
required
to
do
RAID0.

On
a
related
note,
I
decided
to
test
this
theory.  
I
shut
off
the
computer
and
started
fiddling
with
the
drives.  
I
decided
to
just
move
the
drives
out
of
my
WHS
box
and
place
them
in
my
SQL
Server
box
and
ran
square
up
against
my
power
supply.  
I
have
a
700
watt
supply
in
there
but
when
I
added
the
three
drives
into
that
box
the
system
would
turn
on,
then
right
back
off.
When
I
disconnected
the
new
drives
the
computer
turned
on
just
fine.  
These
are
old
western
digital
caviar
250
gig
drives,
the
kind
that
came
out
when
the
SATA
drives
were
just
entering
the
market,
with
a
normal
power
connector
and
a
SATA
connector.  
Anyway,
my
700
watt
supply
just
wouldn't
handle
the
load.

Sigh.

I
now
have
4
of
these
old
WD
drives
just
sitting
there.  
A
terabyte
of
identical
drives
and
no
home
for
them.  
I
guess
I
will
tear
open
one
of
my
other
boxes
and
see
if
I
can
get
them
mounted
in
some
other
system.

John
W. 
Colby
Colby
Consulting
www.ColbyConsulting.com 

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