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  3. October 2006

Re: iSeries and Sans

Mark,
I disagree! It's simple to add another expansion unit, even without powering down the system and creating a new partition!
Switching tapes isn't hard but it takes a bit of coding. In any case I don't think that's your big issue here.
Technology would be iSCSI. Both Copper and Fiber are supported but 1Gbps is the rate. However if the speed is an issue you can gang up multiples. 

As for processor and memory for iSCSI in the i5 hosting partition:.
Rules of Thumb: 21MB in the Machine pool for each target HBA plus 1MB for each NWSD Also a meg or so in the Base pool for each HBA and 0.5MB for each NWSD Also 0.5Meg or so in the QFPHIS Priave pool and 1.0MB for each NWSD.
In other words for each iSCSI Card add about 22.5MB and for each NWSD about 2.5MB to that partition. It is critical to have enough machine pool memory just like any other partition!!
Now for CPU it's done per K of disk IOs from the WinDOZE box. For each Thousand disk I/O per second, about 190 CPW is required. This assumes a standard mix of 35% writes 65% reads and an average I/O size.
I can't speak to reliability directly but the i is very reliable so I wouldn't think it would be much different than the SAN. 


    - Larry

Mark Phippard wrote:
That is all fine if you configure your box that way to begin with, but it is not easy to retrofit a box to this sort of setup. Is there any kind of guidance or wisdom as to how much CPU and memory a partition like this needs?
Backup is a bit of an issue. Moving a tape drive between partitions can work, but not something I'd want to rely on, so you probably need tape drives for each partition. Of course you do for a SAN too, but there is no savings here.
Finally, what technology would the iSeries be using for the SAN feature? iSCSI? How does that compare to the typical Fibre Channel-based SAN for performance and reliability? 

Mark

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