On Wed, Apr 20, 2016 at 12:24 PM, Mark Post <[email protected]> wrote: > >>> On 4/20/2016 at 12:16 PM, John McKown <[email protected]> > wrote: > > Apparently for the DS8700 and above with an option called zDDB. > > > > > http://www.ibm.com/support/knowledgecenter/api/content/SSLTBW_2.2.0/com.ibm > . > > zos.v2r2.ieaa800/fbaasm.htm?locale=en > > Interesting. Some of the details are a little odd, shall we say: > "z/OS FBA devices are implemented as a new device or control unit type in > the Unit Record (UR) class of devices." Wow. A new unit record device. > The first in how many years? > > And > "Given that these devices are defined as Unit Record devices, they cannot > be shared among users on a single system." > > Certainly limits usability. I guess you could think of them as really > high-speed card reader/punches. > > > http://www.ibm.com/support/knowledgecenter/api/content/SSLTBW_2.2.0/com.ibm.zos.v2r2.ieaa800/fbadev.htm > > > Mark Post > > What really seems a bit strange is that it is touted as a way to share data with a "distributed" system, but doesn't say how. E.g. There is a Windows server which has a NTFS file system on a LUN. That LUN can be accessed via zDDB for z/OS. OK. This would mean that the z/OS program using this interface would need to implement the NTFS file system architecture in its own code. The same with ext3, or ext4, or btrfs, or ??? with Linux. Or that the LUN would not have a file system on it at all. It would just be a "raw" device to z/OS and ??? on the SAN side and they would need to implement their own file system time code.
-- "He must have a Teflon brain -- nothing sticks to it" Phyllis Diller Maranatha! <>< John McKown ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
