HI, Fix number 1 is important to tape and to disk emulation. If running with TASKS number low, MFNetDisk will queued all the IO request until the MFNetDisk TASKS will run the request when the TASK will be free to serve. I add a bug which may cause the queue IO request to not be served. This is serious problem which delay the IO until the TASK will be active because of other IO. The event happened when user run backup of DFDSS to disk with big VTOC and many files. the input was tape emulation in MFNetDisk and the disk was a MFNetDisk disk emulation, both in same PC. The number of TASKS was 2. The IO for the job in some case were suspended. New IO request could wake up the TASK to run the queue IO. So,if you have only one job which access the MFNetDisk tape or disk and your IO is suspend and no other job access the MFNetDisk, then your IO will wait for a while. So, I fix the bug. Be aware that this problem can happen also using the standard MFNetDisk (not the PRO).
These fixes required the PC and MF to have the new code at the same time, or the new PC code must be the first. The new code can be download now. Thanks, Shai The second fix is the PRO stacked CCW. All the CCW chain which served by MFNetDisk poorly will be improve by the PRO after adding some code to MFNetDisk. 1. Fix serious problem when the IO may suspended for MFNetDisk. This can happen when the number of MFNetDisk TASKS is low ( I recommanded to try low). This happen to user when TASK=2. The error is when IO request queue and TASK fail to service it. June 25, 2011. 2. Improve dramatically CCW chain performance done in DFDSS when access the VTOC. If the VTOC size to be backup or restore is big, the DFDSS check all the VTOC blocks by doing SEARCHID_MT and SEARCHKEY_EQ. Before the improvement it took 8 minutes in one site to end reading the VTOC few times as it done in DFDSS, after this fix the time is 30 seconds. Be aware that this fix must run in both PC and MF. If you run the new MF fix with the old PC the result will be errors. June 25, 2011. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
