On 6/14/22 16:29, Damien Le Moal wrote:
On 6/15/22 02:49, Bart Van Assche wrote:
From ZBC-2: "The device server terminates with CHECK CONDITION status, with
the sense key set to ILLEGAL REQUEST, and the additional sense code set to
UNALIGNED WRITE COMMAND a write command, other than an entire medium write
same command, that specifies: a) the starting LBA in a sequential write
required zone set to a value that is not equal to the write pointer for that
sequential write required zone; or b) an ending LBA that is not equal to the
last logical block within a physical block (see SBC-5)."
I am not aware of any other conditions that may trigger the UNALIGNED
WRITE COMMAND response.
Retry unaligned writes in preparation of removing zone locking.
Arg. No. No way. AHCI will totally break with that because most AHCI
adapters do not send commands to the drive in the order they are delivered
to the LLD. In more details, the order in which tag bit in the AHCI ready
register are set does not determine the order of command delivery to the
disk. So if zone locking is removed, you constantly get unaligned write
errors.
The performance penalty of zone locking is not acceptable for our use
case. Does this mean that zone locking needs to be preserved for AHCI
but not for UFS?
Thanks,
Bart.
