Ron,
Some corrections about Hitachi boxes:
7700C could be expanded to 1,5TB. 5 cabinets (2L,Controller,2R). It
wasn't described in initial documentation, but Im' pretty sure it is
possible, because I used such configuration.
15 classics sounds horribly, but the same capacity can be easily achived
using *one* 7700E. Again, it is worth to know that 7700E supports 47GB
drives (AFAIR not mentioned in the initial documentation).
Why don't you mention a little younger machines ? I suspect, it's
because they don't fit to your figure <g>
Even 9900V are available on the stock, or latest Symmetrix (pre-DMZ).
Prices are really attractive.
Regarding the licenses: *Some* of them are optional, but if you don't
have the licenses then you don't have all the features you described.
BTW: some disk vendors "tie" the license to the box, so it is possible
and legal to buy the box with the license for PPRC. HDS don't do it.
Last but not least: "Minus n" generation can be price effective, even
with the licenses.
Regarding the solution: I didn't say the soultion based on cheap
(non-USP) DASD is state of the art. No. It has reduced functionality and
limited scalability. However you get 90% of features (IMHO the most
important ones) for fraction of the price. It depends, as usually.
Regards
--
Radoslaw Skorupka
Lodz, Poland
Ron and Jenny Hawkins wrote:
Radoslaw,
All of the software is you mentioned is optional. The only software that is
required for External Storage on the USP or NSC is the Universal Volume
Manager (UVM) Software.
Also, I don't think it is correct to say that all of the software is all
charged at Enterprise price across the board. Some software that delivers
Enterprise Storage functions for cheap disk is charged at Enterprise price
(e.g. TrueCopy), but there is other Software that uses a Tiered Pricing
Model (e.g. Tuning Manager).
I think of software like TrueCopy in the same way as a good quality spanner
- the tool costs the same price whether you use it on a Mercedes or
lawnmower.
I'm not sure how buying minus "n" boxes is going to make cheaper replacement
for TrueCopy and Shadowimage compared to using UVM, as you are still going
to have to buy the licensed software for those boxes in order to have those
features.
For example, if you want to do something like FlashCopy from your current
storage to some minus "n" boxes you will have to buy FDR/PAS or TDMF, or buy
a Remote Copy licence if both boxes are from the same vendor.
I'm just picturing how much floor space and power it would take to store
10TB of data in a 10 year old EMC 5500 or HDS 7700C, compared to a few
drawers of SATA storage using 400GB drives. My fading memory seems to recall
that a 7700 classic could hold about 720GB, so you would need 15 fully
configured boxes to hold 10TB.
I mention the 7700 classic because I seem to recall that you are using 7700
and 7700E for ML2 data. If you had a USP or NSC, then these could be
replaced with some cheap SATA drives, and the only software you would need
is UVM, where UVM is based on External TB only. In most cases there would be
some TCO savings in floor space, environmentals and Maintenance costs, but
we know this varies from site to site and country to country - YMMV.
BTW, how does TrueCopy pricing compare with VTS P2P, including the CX1 units
in both sites?
Ron
SATA drives attached to mainframe looks veeeery good ...unless you see
the prices... I like very much the idea of HDS TagmaStore USP. You can
attach almost any DASD box you have (in fact, CKD boxes are not
supported) and use it as mainframe/or FBA storage. You can mirror it
using PPRC, you can FlashCopy (Shadowimage) it. Everything is OK, except
the prices. You pay license per TB of external storage attached to USP,
you pay "per TB" fees for PPRC and Shadowimage. At the end you'll find
out the SATA storage is cheap, but the solution is not.
For relatively small to average capacities it is more effective to buy
"previous generation" technology DASD boxes (or second hand - in that
case price is dramatically lower), for large capacities tape is still
cost-effective.
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