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
IBM Certified System Administrator - IBM i 6.1
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