SSA Loop config question

[bjverzal]

OK - I have a proposed SSA loop here and I was wondering how it looks to the collective eyes of the list.

I have 2 drawers and 4 hosts.

H1, H2, D1, D2, D3, and D4 will be my abbreviations. Port numbers on the 020 drawers will be preceeded by a dash. For example,

H1-A1/D1-1 is host 1, SSA Adapter connector A-1, drawer 1, port 1. Hope you can follow...

H1-A1 to D1-1
D1-4 to H2-A2
H2-A1 to D1-5
D1-8 to H3-A2
D1-9 to D2-4
D2-5 to H3-A1
D1-16 to D2-1
D2-8 to H4-A1
H4-A2 to D2-9
D2-16 to H1-A2

Hope you can follow.

Obviously, if you can offer a better suggestion (or 2 or 3 or 4...) I'm open.

Thanks, Bill.

 

[gheist]

it is too complex i think even to write

basically you can have as many adaptors and drawers full of disks as you wish in one loop as long as loop are wired in both directions by exactly the same path

ssa target mode can be used to share disks between different adapters

device reservation should be in place if two systems try to use same disks in loop

I have at least 12 5yr old SSA drives in drawer number 6513.187 near my desk and i am not so fanatical about putting them to work

Disk drives usually have speeds from 5MB/s to 20MB/s
so you can safely attach 4 newest 10K++ rpm drives to ssa1
or 16 oldest ...

 

[mrn]

I'm creating a SSA FAQ, take a look in a day or so.

Mike --
| Mike Nixon
| Unix Admin
|

http://www.instantflashshop.com

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