>>>>> "Carl" == Carl Henrik Lunde <chlunde@xxxxxxxxxxx> writes: Carl> Would it also be possible and useful to include the number of Carl> spindles/channels, i.e., how many requests the device can handle Carl> concurrently? CFQ could for example serve two time slices Carl> concurrently if you have sequential reads and the device reports Carl> two spindles. We don't really have a way to get that information at this point. The values exported in my patch set is what the storage vendors in T10 could agree on. I simply applied them to DM and MD devices as well. We're talking to SSD vendors about having their devices export some characteristics that would allow us to schedule I/O more intelligently. The effort of defining what those values might be is work in progress. There has been murmurs about T13 adopting the T10 knobs, much like it happened with form factor and media rotation rate. For more traditional storage we don't really have a good way to distinguish between a 10GB LUN on a million dollar array and a single disk drive. Rotation rate can help and we already use and export that. -- Martin K. Petersen Oracle Linux Engineering -- 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
