With writefua option set to 1, write operations include
the force unit access (fua) flag. Default is 0.
+.. option:: sg_write_mode=str : [sg]
+ Specify the type of write commands to issue. This option can take three values:
+
+ **write**
+ This is the default where write opcodes are issued as usual.
+ **verify**
+ Issue WRITE AND VERIFY commands. The BYTCHK bit is set to 0. This
+ directs the device to carry out a medium verification with no data
+ comparison. The writefua option is ignored with this selection.
+ **same**
+ Issue WRITE SAME commands. This transfers a single block to the device
+ and writes this same block of data to a contiguous sequence of LBAs
+ beginning at the specified offset. fio's block size parameter specifies
+ the amount of data written with each command. However, the amount of data
+ actually transferred to the device is equal to the device's block
+ (sector) size. For a device with 512 byte sectors, blocksize=8k will
+ write 16 sectors with each command. fio will still generate 8k of data
+ for each command but only the first 512 bytes will be used and
+ transferred to the device. The writefua option is ignored with this
+ selection.
I/O depth
~~~~~~~~~
#ifdef FIO_HAVE_SGIO
+enum {
+ FIO_SG_WRITE = 1,
+ FIO_SG_WRITE_VERIFY = 2,
+ FIO_SG_WRITE_SAME = 3
+};
struct sg_options {
void *pad;
unsigned int readfua;
unsigned int writefua;
+ unsigned int write_mode;
};
static struct fio_option options[] = {
.category = FIO_OPT_C_ENGINE,
.group = FIO_OPT_G_SG,
},
+ {
+ .name = "sg_write_mode",
+ .lname = "specify sg write mode",
+ .type = FIO_OPT_STR,
+ .off1 = offsetof(struct sg_options, write_mode),
+ .help = "Specify SCSI WRITE mode",
+ .def = "write",
+ .posval = {
+ { .ival = "write",
+ .oval = FIO_SG_WRITE,
+ .help = "Issue standard SCSI WRITE commands",
+ },
+ { .ival = "verify",
+ .oval = FIO_SG_WRITE_VERIFY,
+ .help = "Issue SCSI WRITE AND VERIFY commands",
+ },
+ { .ival = "same",
+ .oval = FIO_SG_WRITE_SAME,
+ .help = "Issue SCSI WRITE SAME commands",
+ },
+ },
+ .category = FIO_OPT_C_ENGINE,
+ .group = FIO_OPT_G_SG,
+ },
{
.name = NULL,
},
sgio_hdr_init(sd, hdr, io_u, 1);
hdr->dxfer_direction = SG_DXFER_TO_DEV;
- if (lba < MAX_10B_LBA)
- hdr->cmdp[0] = 0x2a; // write(10)
- else
- hdr->cmdp[0] = 0x8a; // write(16)
-
- if (o->writefua)
- hdr->cmdp[1] |= 0x08;
-
+ switch(o->write_mode) {
+ case FIO_SG_WRITE:
+ if (lba < MAX_10B_LBA)
+ hdr->cmdp[0] = 0x2a; // write(10)
+ else
+ hdr->cmdp[0] = 0x8a; // write(16)
+ if (o->writefua)
+ hdr->cmdp[1] |= 0x08;
+ break;
+ case FIO_SG_WRITE_VERIFY:
+ if (lba < MAX_10B_LBA)
+ hdr->cmdp[0] = 0x2e; // write and verify(10)
+ else
+ hdr->cmdp[0] = 0x8e; // write and verify(16)
+ break;
+ // BYTCHK is disabled by virtue of the memset in sgio_hdr_init
+ case FIO_SG_WRITE_SAME:
+ hdr->dxfer_len = sd->bs;
+ if (lba < MAX_10B_LBA)
+ hdr->cmdp[0] = 0x41; // write same(10)
+ else
+ hdr->cmdp[0] = 0x93; // write same(16)
+ break;
+ };
} else {
sgio_hdr_init(sd, hdr, io_u, 0);
hdr->dxfer_direction = SG_DXFER_NONE;
.BI (sg)writefua \fR=\fPbool
With writefua option set to 1, write operations include the force
unit access (fua) flag. Default: 0.
+.TP
+.BI (sg)sg_write_mode \fR=\fPstr
+Specify the type of write commands to issue. This option can take three
+values:
+.RS
+.RS
+.TP
+.B write (default)
+Write opcodes are issued as usual
+.TP
+.B verify
+Issue WRITE AND VERIFY commands. The BYTCHK bit is set to 0. This
+directs the device to carry out a medium verification with no data
+comparison. The writefua option is ignored with this selection.
+.TP
+.B same
+Issue WRITE SAME commands. This transfers a single block to the device
+and writes this same block of data to a contiguous sequence of LBAs
+beginning at the specified offset. fio's block size parameter
+specifies the amount of data written with each command. However, the
+amount of data actually transferred to the device is equal to the
+device's block (sector) size. For a device with 512 byte sectors,
+blocksize=8k will write 16 sectors with each command. fio will still
+generate 8k of data for each command butonly the first 512 bytes will
+be used and transferred to the device. The writefua option is ignored
+with this selection.
+
.SS "I/O depth"
.TP
.BI iodepth \fR=\fPint