Hi folks, according to https://www.jmicron.com/file/download/1002/JMS583_Product+Brief.pdf my USB-C M.2 adapter "JMicron USA Technology Corp. JMS583Gen 2 to PCIe Gen3x2 Bridge" is supposed to support trim, but sg_vpd reports {root@cecil:data10 () 506} sg_vpd -p bl /dev/sdd Block limits VPD page (SBC): Write same non-zero (WSNZ): 0 Maximum compare and write length: 0 blocks [Command not implemented] Optimal transfer length granularity: 8 blocks Maximum transfer length: 65535 blocks Optimal transfer length: 65535 blocks Maximum prefetch transfer length: 65535 blocks Maximum unmap LBA count: -1 [unbounded] Maximum unmap block descriptor count: 63 Optimal unmap granularity: 0 blocks [not reported] Unmap granularity alignment valid: false Unmap granularity alignment: 0 [invalid] Maximum write same length: 0 blocks [not reported] Maximum atomic transfer length: 0 blocks [not reported] Atomic alignment: 0 [unaligned atomic writes permitted] Atomic transfer length granularity: 0 [no granularity requirement Maximum atomic transfer length with atomic boundary: 0 blocks [not reported] Maximum atomic boundary size: 0 blocks [can only write atomic 1 block] {root@cecil:data10 () 507} sg_vpd -p lbpv /dev/sdd Logical block provisioning VPD page (SBC): Unmap command supported (LBPU): 1 Write same (16) with unmap bit supported (LBPWS): 0 Write same (10) with unmap bit supported (LBPWS10): 0 Logical block provisioning read zeros (LBPRZ): 0 Anchored LBAs supported (ANC_SUP): 0 Threshold exponent: 0 [threshold sets not supported] Descriptor present (DP): 0 Minimum percentage: 0 [not reported] Provisioning type: 0 (not known or fully provisioned) Threshold percentage: 0 [percentages not supported] {root@cecil:data10 () 508} lsusb Bus 002 Device 004: ID 152d:0583 JMicron Technology Corp. / JMicron USA Technology Corp. JMS583Gen 2 to PCIe Gen3x2 Bridge : You can surely better estimate than me whether these values sound reasonable. Do they? I hesitate to set provisioning_mode to unmap. Device is an ICY BOX M.2 SSD/NVMe adaptor IB-1807MT-C31. Regards Harri
