Got feedback that this problems occurs not only on z/VM 6.4 but also on 7.1, and it indeed seems to be an issue with thin provisioning (LP 1830731 #3). It seems to happen with virtual devices and MDISKS, but not with dedicated DASDs. Fix is in progress by IBM.
Got feedback that this problems occurs not only on z/VM 6.4 but also on 7.1, and it indeed seems to be an issue with thin provisioning (LP 1830731 #3). It seems to happen with virtual devices and MDISKS, but not with dedicated DASDs. Fix is in progress by IBM.