Radoslaw,
> 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.
That's correct using 9GB drives. The 7700s I've worked with used the
original 4.5GB drives
> 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).
The 7700E supports up to 73GB drives, with a total of 18TB with all ACP and
cabinets installed. 10TB would need three cabinets (Controller plus two
Array Cabinets), which takes up about the same space as three refrigerators
or a Symmetrix 5500, 87nn, 89nn, DMX2K, DMX3K and DMX3.
This is still significantly larger than two SATA drawers in a 19" rack.
> 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.
Yes, I chose the oldest unit that I recall you are using (I checked your
post of Jan1 last year and you did say HDS7700) to dress up the argument.
The Maintenance on 10TB of DASD more than two or three years old would still
be a damn site more expensive than 10TB of SATA disk.
Of course if your not paying for maintenance that's a different matter.
>
> 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.
The software is licensed and runs on the USP or NSC, not the SATA storage.
No-one is asking IBM or Innovation for a discount when you use their
utilities to copy from disk to tape, so why do you want it for SATA.
A 10TB licence for Shadowimage allows you to copy to and from any internal
and external drives as long as the sessions don't exceed 10TB. What you're
asking is to have three different prices for Shadowimage:
1) Internal <==> internal
2) Internal <==> SATA
3) SATA <==> SATA
What about if you are using a 7700E for external storage - should there be
another price structure? Anyway, I'll sit on this until DSS and FDR have a
cheap "Disk to Tape" licence.
>
> 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.
Maybe we've missed the point. The whole idea of hooking up old and/or cheap
kit to the USP or NSC is to provide that kit with functionality and
scalability that it doesn't have.
Ron
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