Hi, I am using tgt as iscsi server, and found linux kernel said that a tgt scsi target does not support DPO and FUA: [ 4671.673196] scsi8 : iSCSI Initiator over TCP/IP [ 4671.928530] scsi 8:0:0:0: RAID IET Controller 0001 PQ: 0 ANSI: 5 [ 4671.928800] scsi 8:0:0:0: Attached scsi generic sg5 type 12 [ 4671.929454] scsi 8:0:0:1: Direct-Access IET VIRTUAL-DISK 0001 PQ: 0 ANSI: 5 [ 4671.930878] sd 8:0:0:1: Attached scsi generic sg6 type 0 [ 4671.932074] sd 8:0:0:1: [sde] 6144000 512-byte logical blocks: (3.14 GB/2.92 GiB) [ 4671.932273] sd 8:0:0:1: [sde] Write Protect is off [ 4671.932277] sd 8:0:0:1: [sde] Mode Sense: 69 00 00 08 [ 4671.932420] sd 8:0:0:1: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Why does not tgt support these two features ? but I have found its source code handle DPO and FUA flag in its bs_rdwr.c. Regards, Tom -- To unsubscribe from this list: send the line "unsubscribe stgt" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html