hesela.devSCSI GET LBA STATUS
SCSI GET LBA STATUS reports logical-block provisioning information for returned address ranges.
The 16-byte and 32-byte command variants return extent descriptors, not file contents. The starting LBA, response-size limit and report type determine the requested view; returned coverage must be checked before treating it as a device-wide map. [1]
The report-type-processed (RTP) bit indicates whether the requested filtering was honored. A query does not guarantee a consistent snapshot: concurrent changes may make its report inconsistent or outdated. [2]
Offline decoding is another boundary. In Hesela's synthetic-capture test, two identified sg_get_lba_status builds printed two descriptor rows from a header-only input and returned success. Validate captured byte counts independently; a complete response frame still need not cover the device. This is a parser observation, not a hardware experiment. [3]
Relations
- related
- Logical block provisioning status, SCSI LBPRZ, SCSI UNMAP, SCSI logical unit (LU), Thin provisioning
Limitations
- A reported deallocated extent does not measure physical capacity recovered or establish sanitization. [2]
Citations
- sg3_utils: GET LBA STATUS manual (commit 1929463554c5)
- Seagate SCSI Commands Reference, Rev. M: sections 3.4, 3.25.2, 3.58 and 5.4.13
- Hesela: offline SCSI capture framing, method and two-build fixture observations
Sources & caveats
- Protocol explanation from a pinned sg3_utils source revision and the June 2022 reference manual; no device experiment.
- Original synthetic-response observations: 49 deterministic cases per executable; software versions and hashes in the linked method.