Package: hw-detect Version: 1.116 Severity: important Tags: d-i On Linux on z Systems, there are two major disk storage environments, the direct-attached storage disk (DASD) and SCSI over Fibre-Channel.
There are the s390-dasd and s390-zfcp d-i modules to configure and enable DASDs and FCP devices. Note that on s390x, disks are not available by default to Linux and must be enabled in advance. The s390-dasd and s390-zfcp both provide the harddrive-detection dependency and, thus, each could fulfill the dependency to silenty ignore the other. That behavior does not allow to mix DASDs and SCSI disk on single installation (except you call both manually, for example, in the expert mode). To improve and provide a "guided" flow, I have split the harddrive detection dependency for s390-dasd and s390-zfcp as follows: - s390-dasd provides harddrive-detection-dasd - s390-zfcp provides harddrive-detection-zfcp disk-detect depends on -> harddrive-detection-dasd -> harddrive-detection-zfcp and continues to provide the harddrive-detection. With this split, the guided installation will install disk-detect to solve the harddrive-detection dependency. In turn, disk-detect will then rely on the s390-dasd and s390-zfcp d-i modules to provide DASD and FC-attached SCSI disks. If both modules fail, the user perceives the default disk-detect behavior, for example, users might configure iSCSI. The other nice benefit of this dependency split is the seamlessly enablement of multipath with disk-detect (through preseeding). For s390, multipathing should be always considered when SCSI is used. I probably will extend the s390-zfcp module to set disk-detect's multipath debconf variable for usability. I will attach a patch with changelog when I have received the bug number for report. For s390-dasd and s390-zfcp, I will also open bug reports to implement the dependency chain. Feedback is welcome. Thanks and kind regards, Hendrik -- Hendrik Brueckner brueck...@linux.vnet.ibm.com | IBM Deutschland Research & Development GmbH Linux on z Systems Development | Schoenaicher Str. 220, 71032 Boeblingen
