Isi get output

Hi guys

Do you know what this /2 meant by

The out put from #isi get cmd?

Isi get output summary

/ifs/home/newUser1:

default 4+2/2 concurrency on .cshrc

I know this is protection n+2:1 , but not sure /2 for. Would this be up to 2 disks can be failed? Or this mean divided by 2?

Thanks!