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Re: Disk requirement (performance-wise) on a Power 7 replacing a System i 520



fixed

You are correct sir !
With SSD maintenance charge is per unit (US$48/MONTH on the 387GB units).
Plus you'd still pay additional for any expansion units you need to house them, just like with HDD's.


Neil Palmer, Waterloo, Ontario, Canada

(This account not monitored for personal mail,
remove the last two letters before @ for that)

--------------------------------------------
On Wed, 10/23/13, rob@xxxxxxxxx <rob@xxxxxxxxx> wrote:

Subject: Re: Disk requirement (performance-wise) on a Power 7 replacing a System i 520
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Received: Wednesday, October 23, 2013, 9:48 AM

Not only that, but isn't maintenance
for spinning disks included in the
machine but extra for SSD's?  If the goal was to get a
new box for what
he's paying for maintenance then adding extra maintenance on
kind of kills
that, eh?


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to:  2505 Dekko Drive
          Garrett, IN 46738
Ship to:  Dock 108
          6928N 400E
          Kendallville, IN 46755
http://www.dekko.com





From:   Neil Palmer <neilpalmer400mr@xxxxxxxx>
To:     Midrange Systems Technical
Discussion <midrange-l@xxxxxxxxxxxx>
Date:   10/22/2013 10:55 PM
Subject:        Re: Disk requirement
(performance-wise) on a Power 7
replacing a     System i 520
Sent by:        midrange-l-bounces@xxxxxxxxxxxx



Rob,

Yep - you can drop a lot of arms on newer systems and still
outperform a
lot more older disks/arms - as you discovered.
I'd guess just a few 15k RPM SAS drives (139.5GB or 283GB)
would
outperform a flock of old 4 or 8GB drives.
Besides, what current/new system could you attach those to,
and where
would you get them from
- apart from a museum, garbage dump - or raiding Frankie
!   ;-)

Also with the new 3rd generation SSD's available December 6
(387GB and
775GB) you're also getting to the point where you may be
better off say
with a new small sized box and 2 to 4 SSD's (mirrored)
instead of spending
the extra for additional expansion units to house a load of
spinners (if
you needed more more than the 8 spinners in the CEC).

Of course with a 15k RPM SAS 139.5GB spinner at US$498 and a
283GB at
US$950, vs.
a 387GB SSD at US$3588 and 775GB SSD at US$6200 there's
still a bit of a
price spread
the savings from dropping additional expansion units need to
cover.  :-)
(One thing with the SSD though is you can order one 4-pack
at a special
price on a new system, so for example instead of the first 4
x 387GB SSD's
costing US$14,352 you can get them for US$12,917).

Neil Palmer, Waterloo, Ontario, Canada

(This account not monitored for personal mail,
remove the last two letters before @ for that)

--------------------------------------------
On Tue, 10/22/13, rob@xxxxxxxxx <rob@xxxxxxxxx>
wrote:

Subject: Re: Disk requirement (performance-wise) on a Power
7 replacing a
System i 520
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Received: Tuesday, October 22, 2013, 3:01 PM

Should 70GB drives be used for stale
data?  These drives are so huge that
wouldn't one be better off just using them for non
volatile
data and use a
bunch of 4 or 8gb drives instead for their more volatile
data?  This way
you get more arms?

Not a real question.  It's just something to put how
times are changing
into perspective.  With disks available in >800Gb
size, which is currently
22 times the size of Jeff's current drives (which is close
to the ratio
between 4 and 70GB drives), let's not assume that such
monsters are best
just utilized for stale non volatile data.

Just speaking as someone who once went from 42 arms down
to
7 and got much
better performance.


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to:  2505 Dekko Drive
           Garrett, IN
46738
Ship to:  Dock 108
           6928N 400E
           Kendallville,
IN 46755
http://www.dekko.com

--


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