>>>>> "Doug" == Douglas Gilbert <dgilbert@xxxxxxxxxxxx> writes: >> Maximum Unmap LBA Count> 0 (in combination with the descriptor count) >> are what indicate that the device server supports UNMAP. Doug> That has been superseded by the TPU and TPWS bits in the Thin Doug> provisioning VPD page (B2h) in sbc3r22. TPU and TPWS indicate Doug> support for the UNMAP and WRITE SAME (16) with UNMAP bit ** Doug> commands respectively. *sigh* this is getting more and more convoluted. I really wish T10 had been able to agree on a single approach instead of 2. Doug> I think sbc3r22 is just flaky in that area and will be cleaned up Doug> soon. As the words stand now, in the Block limits VPD page Doug> "maximum unmap lba count" only applies to the UNMAP command while Doug> "optimal unmap granularity" applies to both the UNMAP command and Doug> the WRITE SAME(16) command. Inconsistent. And "maximum unmap lba Doug> count"==0 implying no UNMAP command is pointless given the TPU Doug> bit. I'll ask around and see what the plans are in T10 when I get back from vacation next week. And I'll try to adjust our heuristics accordingly. -- 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
