And, you should be aware that LINK uid vdev vdev MW is ***very dangerous***
An MW link should never be used for CMS minidisks, use M or MR instead. Every unexperienced VMer uses MW... until he gets a corrupted minidisk. With MW you allow concurrent updates and as CMS keeps minidisk structures in storage (for ACCESSed mindisks that is), two users updating the same minidisk lead to corruption. One doesn't even need to perform an explicit write: this sequence can be enough to cause corruption. LINK uuu vvvv zzz MW ACCESS zzz Z RELEASE Z Because at RELEASE time, CMS writes the allocation map back to disk > ________________________________ > > From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On > Behalf Of Howard Rifkind > Sent: Monday, June 09, 2008 3:46 PM > To: IBMVM@LISTSERV.UARK.EDU > Subject: DDR Minidisk Restore Problem. > > > > Hello all, > > > > I'm having a problem restoring minidisks which I backed up using DDR. > > Backing them up all on one tape. > > > > I batched up a bunch of minidisks, a quick sample is below: > > > > SYSPRINT CONS > > PROMPTS OFF > > INPUT 12C4 3390 > > OUTPUT 181 3590 (LEAVE > > DUMP ALL > > INPUT 1191 3390 > > OUTPUT 181 3590 (LEAVE > > DUMP ALL > > INPUT 12A2 3390 > > OUTPUT 181 3590 (LEAVE > > DUMP ALL > > > > All are going to the same tape. The first mini at 12C4 is empty. But, this > didn't create any error during the dump process and all the other DDR Dumps > complete with problems. > > > > However during the restore: > > > > SYSPRINT CONS > > PROMPTS OFF > > INPUT 181 3590 > > OUTPUT 12C4 3390 > > RESTORE ALL > > INPUT 181 3590 > > OUTPUT 1191 3390 > > RESTORE ALL > > INPUT 181 3590 > > OUTPUT 12A2 3390 > > RESTORE ALL > > > > Just the first minidisk restores to 12C4, which by the way there isn't any > records. > > > > Then I get an endless stream of CCW errors on the 181 tape. > > > > The minidisks to be restored are all R/W as an example indicates below: > > DASD 111F 3390 VPDPS1 R/W 8 CYL ON DASD 04B8 SUBCHANNEL = 0039 > > DASD 1191 3390 VPDPS1 R/W 9 CYL ON DASD 04B8 SUBCHANNEL = 002C > > DASD 129D 3390 VPDPS1 R/W 9 CYL ON DASD 04B8 SUBCHANNEL = 0032 > > > > To get to the first minidisk I did a: > > > > CP LINK USERA 11F 111F MW > > > > Links are all O.K. no errors on any of the links. > > > > Any thoughts on this would be appreciated. > > > > Thanks. > -- Kris Buelens, IBM Belgium, VM customer support
