Harald,
>> > I tried a discard on a Samsung PM981 1TB SSD (m.2) using a JMicron USB adaptor.
>> >
>> > udev rule:
>> >
>> > ACTION=="add|change", ATTRS{idVendor}=="152d",
>> > ATTRS{idProduct}=="0583", SUBSYSTEM=="scsi_disk",
>> > ATTR{provisioning_mode}="unmap"
>> >
>> > Probably I was too optimistic.
> In the code comments above the WARN, this condition indicates "the
> discard granularity isn't set by buggy device driver". The block layer
> needs this set if your driver also sets the max_discard_sectors limit.
Please provide the output of:
# sg_readcap -l /dev/sdN
# sg_vpd -l /dev/sdN
# sg_vpd -p 0xb0 /dev/sdN
# sg_vpd -p 0xb1 /dev/sdN
# sg_vpd -p 0xb2 /dev/sdN
# sg_opcodes /dev/sdN
Thanks!
--
Martin K. Petersen Oracle Linux Engineering
