[c-nsp] Memory requirements question

[Bernd Ueberbacher]

Hi everyone!

I just have a short question about memory requirements.
I'd like to upgrade a 2610XM router which has 32 MB of flash. The IOS 
image I'd like to use is about 24 MB in size. The IOS upgrade planner 
says that 48 MB are required.
The image would fit into the 32 MB of course, but how much space has to 
be left free so that a router has enough flash to opperates properly? Is 
there any general formula (or percentage) to calculate the requirements 
or how do I have to understand the flash requirements?

It also doesn't seem easy to find 48 MB flash for a 2610XM. I guess they 
are either pretty rare or still very in demand and I also don't wanna 
spend too much money, as this router is only in my CCNA lab.
Would the 32 MB be enough if I load the image from tftp?


Thanks,
Bernd


PS: Yes, I googled, but just found about 1.000.000.000 site where I 
could buy the Cisco memory, but no answer to my question ;-)