what is the Pool limit to do URI redirection using irule

Jagadeesh I don't know of a KB article off the top of my head but I'm sure one exists. The following is what I put together assuming you have a default pool to handle all traffic that isn't defined in the data-group.

when CLIENT_ACCEPTED priority 500 {

    set DEFAULT_POOL [LB::server pool]

}

when HTTP_REQUEST priority 500 {

    set URI [string tolower [HTTP::uri]]

    if { [class match -- ${URI} eq CLASS-URI-TO-POOL] } {

        set TEMP_POOL [class match -- -value $URI eq CLASS-URI-TO-POOL]

        pool ${TEMP_URI}

    } else {
        $DEFAULT_POOL
    }

}

In your data-group called CLASS-URI-TO-POOL the string field would have the path and the value field will be the pool name that matches it.