When Linux sees PAV is available, it can issue more than one I/O to a disk. Otherwise Linux will queue the I/O. In such a case CP can exploit PAV only when multiple guests have minidisks on the same pack.
So: it depends, CP's PAV support can not replace PAV in a guest. 2009/10/2 Krueger Richard <[email protected]> > Thank you all for the input. After trying and failing to make the MINIOPT > user directory statement work, the ticket with IBM took a positive turn, > and have what I think is a good answer. They pointed me to CP Planning > Manual section "Using HyperPAV Minidisks" which indicates for MDISK > allocations (the way we are allocating space) z/VM will automatically use > PAV if present. This means there is no need, as discussed in the SC33- > 8414-00 manual, to try and cause the z/Linux guest to use PAV with COMMAND > DEFINE HYPERPAVALIAS, DASDOPT, or MINIOPT statements in the user directory. > -- Kris Buelens, IBM Belgium, VM customer support
