Mixed stack IOS upgrade - Cisco 3750x,3750G

Question

I have a mixed switch stack : -

Switch Ports Model              SW Version            SW Image                 
------ ----- -----              ----------            ----------               
*    1 52    WS-C3750G-48PS     12.2(55)SE            C3750-IPBASEK9-M         
     2 54    WS-C3750X-48P      12.2(55)SE            C3750E-UNIVERSALK9-M     
     5 54    WS-C3750X-48P      12.2(55)SE            C3750E-UNIVERSALK9-M     

Now, I am required to upgrade the stack to SE10 versions of the IOS code.

Steps that I will be taking:-

1. Copy SE10 version of IPBASE on switch 1
2. Copy SE10 version of UNIVERSAL9 on switch2,5.
3. Change boot statements to the respective IOS files.
4. Reload the stack.

Questions/Concerns:-

1. Is this the best method to go for this task?
2. Will this cause mismatch between the switch and cause the stack to break?

Answer 1

Your process is correct, and assuming you get the same version number for all of them, you should be fine. If you're connected to the stack master, a "dir" should show flash file systems matching each switch (flash-1:, flash-2:, flash-5:).

Remember these when you're copying the files over, but I don't think you'll need them when you go to configure your boot statement - you should be able to just say "boot system switch 1 flash:", "boot system switch 2 flash:," etc.

The flash on those switches should be big enough to hold a second copy of IOS. I'd recommend retaining your current version of IOS in addition to the new version to make roll-back easy.