Hi Folks, We've been using IBM 9393 (a.k.a. STK Iceberg) DASD for many years now. It has worked terrific, but we'll need to upgrade in the near future to a newer technology. The things I love about the 9393 (with the SnapShot microcode feature) is that it is natively supported by CMS, including:
* SIBFMTSS replacement for CMS FORMAT command. CMS FORMAT commands complete instantly (less than 1 second) with virtually no I/O on the channel * SIBVMRVA MODULE provides an easy programming interface to the 9393 SnapShot functions, with control returned to the calling program on completion. * The SnapShot command snaps a volume in less than 1 second with virtually no I/O on the channel, and requires virtually no back-end storage (i.e. it's not actually making a track by track copy, just pointers to deltas between the source and snapped volumes). I know most modern DASD provides methods of "snapping" volumes, but which ones work best in a native VM/CMS environment? In particular, we absolutely MUST have a replacement for the CMS FORMAT module since we format a ton of CMS mdisks (often TDisk) daily. I'd LOVE to find a model that extends these enhancements to the Linux environment with a 'dasdfmt' replacement as well. -TIA -Mike
