Hello,

I use dfconv to load 3 vsam files, at a customer they leave 8 in parallel, and it takes several minutes to finish, the filesystem is of type gpfs (ibm).

I tried several options with extfh idxfileformat 8, readsema = off, dfconv 32 \\ dfconv64 but it is always very slow, 

I have noticed that many processes remain with status D for a long time and I always find "cxiWaitEventWait" with
ps -eo ppid, pid, user, stat, pcpu, comm, wchan: 32

44957 46189 ssdv2 D + 17.3 dfconv32 down
45123 46193 ssdv2 D + 17.5 dfconv32 cxiWaitEventWait
44963 46198 ssdv2 D + 18.0 dfconv32 cxiWaitEventWait

disk is very fast on txt files and all other processes, mfsort is also very fast, both has a speed of 2GB\\s

this anomaly on my test system with the same runtime version 5.6 has no problems, but I have a different filesystem (xfs)

what could cause this slowdown?  it might depend on the gpfs filesystem?

thank you
Greetings