For zfcp, we still have the patch from http://marc.info/?l=linux-scsi&m=119461369332621&w=2 pending that adds the export of additional statistics from the adapter to sysfs. There were some discussions, whether the attributes should be added to the SCSI host and devices, but there was no conclusion. To find a solution that can be merged upstream, here is an overview of the data currently available and the data that we want to add for the adapter (The above patch also adds latencies to the SCSI devices, but i think this should be discussed later). As short background, on s390, an FCP adapter can be shared by multiple Linux systems, that is the reason for the two data sets. Currently, there is in the FC transport class - number of input/output/control requests - input/output megabytes for the FCP adapter (== the sum of requests/transferred data for all systems sharing the adapter). The new patch adds - number of input/output/control requests - input/ouput megabytes for the current system using the adapter. The proposal of the patch was to add the attributes 'requests' and 'megabytes' to the SCSI host in sysfs. Alternatives i currently see: - add attributes to the underlying CCW device (not the adapter) - add new attributes to the FC transport class What is the best way to export the data? The other two attributes for - utilization of channel and adapter and - time the connection between Linux and FCP adapter has been active are not related to any existing attributes, but the question is the same: Does the proposal for adding the data to the SCSI host make sense, or should the data be added to the CCW device or the FC host statistics? Christof -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
