--- snip --- 2. Two DASD boxes connected together. Several volume pairs are established. Let's assume, there is a problem with I/O (write) on volume VOLA, next waiting write is on VOLB. There is no problem with VOLB. Will the controller allow VOLB to be updated ? In other words, does the DASD controller queue all the (sometimes concurrent, multi-threaded) writes and perform them in the timestamp order ? --- snip ---
I/Os run concurrently. If the I/Os are independent, then the updates to VOLB will occur even if VOLA has a problem. You say "next waiting write", so I assume they are dependent I/Os. The application will receive the I/O error (for VOLA) and have to deal with it. It shouldn't then send off a write to VOLB! John. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
