SLR140 with new mt(1) [Was: Re: sa(4) driver changes available for test]

Wed Mar 11 19:27:04 UTC 2015

 Bezüglich Kenneth D. Merry's Nachricht vom 28.02.2015 01:08 (localtime):
…
>> Still just works fine ! :-) (stable_10.20150218.1-patchset with LTO2,
>> LTO3 and DDS5)
>> With DDS5, densitiy is reported as "unknown". If I remember correctly,
>> you have your DDS4 reporting "DDS4"?
> That means that we need to add DDS5 to the density table in libmt.  Can
> you send the output of 'mt status -v'?  It would actually be helpful for
> all three drives.

Hello,

I'd like to present some test results.
All tests were done with 10-stable-r273923 and Ken's
sa_driver_changes-patchset, reduced by the commited scsi-sys-code.

Unfortunately, there's a problem with appending files to any SLRtape. I
can write the first file, but trying to open a second file for writing,
results in "end of device" message. This problem doesn't exist for other
drives (tested on VXA-2 (also SCSI-2) and DAT72 (SCSI-3)) with exactly
same environment (all currently connected SCSI drives (7) are on one
mpt(4) bus).
After the first "end of device" message, consecutive write attempts lead
to "Operation not permitted".

According to the datasheet
(http://www.tandbergdata.ru/products/files/SLR140_DS_605_ENG.pdf), the
drive should speak SCSI-3, but camcontrol shows SCSI-2.

##################
TandbergData SLR140 Drive
##################
camcontrol inq $TAPE -v
pass3: <TANDBERG SLR140 0605> Removable Sequential Access SCSI-2 device
pass3: Serial Number SN140253489
pass3: 40.000MB/s transfers (20.000MHz, offset 15, 16bit), Command
Queueing Enabled

Density 0x36 = ALRF-6, 186000 bpi, SLR140 drive + SLR140tape:
SLRtape140 (8mm DualReel, 70GB native, 505.9m length, 5.5MiB/s)
mt status -v
Drive: sa3: <TANDBERG SLR140 0605> Serial Number: SN140253489
---------------------------------
Mode Density Blocksize bpi Compression
Current: 0x36:UNKNOWN variable 0 enabled (0x3)
---------------------------------
Current Driver State: at rest.
---------------------------------
Partition: 0 Calc File Number: 0 Calc Record Number: 0
Residual: 0 Reported File Number: -1 Reported Record Number: -1
Flags: None
---------------------------------
Tape I/O parameters:
Maximum I/O size allowed by driver and controller (maxio): 131072 bytes
Maximum I/O size reported by controller (cpi_maxio): 131072 bytes
Maximum block size supported by tape drive and media (max_blk): 262144 bytes
Minimum block size supported by tape drive and media (min_blk): 1 bytes
Block granularity supported by tape drive and media (blk_gran): 0 bytes
Maximum possible I/O size (max_effective_iosize): 131072 bytes

Minimum blocksize to reach highest throughput, thus sustained write of
uncompressable data (from /dev/random): 24k at 5.5MiB/s

mt status
---------------------------------
Current Driver State: at rest.
---------------------------------
Partition: 0 Calc File Number: 1 Calc Record Number: 0
Residual: 0 Reported File Number: -1 Reported Record Number: -1
Flags: None

"short READ POSITION"
camcontrol cmd $TAPE -v -c "34 0 0 0 0 0 0 0 0 0" -i 20 - | hd
00000000 30 00 00 00 00 00 06 83 00 00 00 00 00 00 00 00 |0...............|
00000010 00 00 00 00 |....|
00000014
"vendor READ POSITION"
camcontrol cmd $TAPE -v -c "34 1 0 0 0 0 0 0 0 0" -i 20 - | hd
camcontrol: error sending command
(pass3:mpt1:0:13:0): READ POSITION. CDB: 34 01 00 00 00 00 00 00 00 00
(pass3:mpt1:0:13:0): CAM status: SCSI Status Error
(pass3:mpt1:0:13:0): SCSI status: Check Condition
(pass3:mpt1:0:13:0): SCSI sense: ILLEGAL REQUEST asc:24,0 (Invalid field
in CDB)
(pass3:mpt1:0:13:0): Command byte 1 bit 0 is invalid
"long READ POSITION"
camcontrol cmd $TAPE -v -c "34 6 0 0 0 0 0 0 0 0" -i 32 - |hd
camcontrol: error sending command
(pass3:mpt1:0:13:0): READ POSITION. CDB: 34 06 00 00 00 00 00 00 00 00
(pass3:mpt1:0:13:0): CAM status: SCSI Status Error
(pass3:mpt1:0:13:0): SCSI status: Check Condition
(pass3:mpt1:0:13:0): SCSI sense: ILLEGAL REQUEST asc:24,0 (Invalid field
in CDB)
(pass3:mpt1:0:13:0): Command byte 1 bit 2 is invalid

Different tapes
----------------------
Density 0x34 = ALRF-1, 15400 bpi:
SLRtape100 (8mm DualReel, 50GB native, 457.2m length, 4.7MiB/s)
SLRtape40 (8mm DualReel, 20GB native, 187,5m length, 4.7MiB/s)
Mode Density Blocksize bpi Compression
Current: 0x36:UNKNOWN variable 0 enabled (0x3)

Density 0x30 = MLR3, 103124 bpi:
SLRtape50 (¼" (Quarter inch) DualReel, 25GB native, 457.2m length, 1.8MiB/s)

##########
Exabyte VXA-2
##########
camcontrol inq $TAPE -v
pass9: <EXABYTE VXA-2 1009> Removable Sequential Access SCSI-2 device
pass9: Serial Number 0085105377
pass9: 80.000MB/s transfers (40.000MHz, offset 32, 16bit), Command
Queueing Enabled

Density 0x81 = ??? (no info about areal density found, nor bpi/ftpi)
VXA-2 Drive + V10 Tape
VXA V10 (8mm DualReel, 20GB native, 120m length, 5.6MiB/s)
mt status -v
Drive: sa4: <EXABYTE VXA-2 1009> Serial Number: 0085105377
---------------------------------
Mode Density Blocksize bpi Compression
Current: 0x81:UNKNOWN variable 0 enabled (0x3)
---------------------------------
Current Driver State: at rest.
---------------------------------
Partition: 0 Calc File Number: 0 Calc Record Number: 0
Residual: 0 Reported File Number: -1 Reported Record Number: -1
Flags: None
---------------------------------
Tape I/O parameters:
Maximum I/O size allowed by driver and controller (maxio): 131072 bytes
Maximum I/O size reported by controller (cpi_maxio): 131072 bytes
Maximum block size supported by tape drive and media (max_blk): 245760 bytes
Minimum block size supported by tape drive and media (min_blk): 1 bytes
Block granularity supported by tape drive and media (blk_gran): 0 bytes
Maximum possible I/O size (max_effective_iosize): 131072 bytes

Minimum blocksize to reach highest throughput, thus sustained write of
uncompressable data (from /dev/random): 24k at 5.6MiB/s

mt status
---------------------------------
Current Driver State: at rest.
---------------------------------
Partition: 0 Calc File Number: 4 Calc Record Number: 0
Residual: 0 Reported File Number: -1 Reported Record Number: -1
Flags: None

"short READ POSITION"
camcontrol cmd $TAPE -v -c "34 0 0 0 0 0 0 0 0 0" -i 20 - | hd
00000000 00 00 00 00 00 00 39 39 00 00 00 00 00 00 00 00 |......99........|
*
00000010

"vendor READ POSITION"
camcontrol cmd $TAPE -v -c "34 1 0 0 0 0 0 0 0 0" -i 20 - | hd
00000000 00 00 00 00 00 00 39 39 00 00 00 00 00 00 00 00 |......99........|
*
00000010

"long READ POSITION"
camcontrol cmd $TAPE -v -c "34 6 0 0 0 0 0 0 0 0" -i 32 - |hd
camcontrol: error sending command
(pass9:mpt1:0:15:0): READ POSITION. CDB: 34 06 00 00 00 00 00 00 00 00
(pass9:mpt1:0:15:0): CAM status: SCSI Status Error
(pass9:mpt1:0:15:0): SCSI status: Check Condition
(pass9:mpt1:0:15:0): SCSI sense: ILLEGAL REQUEST asc:24,0 (Invalid field
in CDB)
(pass9:mpt1:0:15:0): Command byte 1 bit 2 is invalid

No other tape cartridges available for testing at the moment (X6 to
follow together with VXA-320 drive results)

################
Seagate/Quantum DAT72 (DDS-5)
################
camcontrol inq $TAPE -v
pass0: <SEAGATE DAT DAT72-052 A16K> Removable Sequential Access SCSI-3
device
pass0: Serial Number HV082SN
pass0: 80.000MB/s transfers (40.000MHz, offset 32, 16bit), Command
Queueing Enabled

Density 0x47 = PRML, 162000 bpi, DAT72 Drive + DAT72 media
DAT-72 Cartridge (3.81mm DualReel, 36GB native, 170m length, 3.2MiB/s):
mt status -v
Drive: sa0: <SEAGATE DAT DAT72-052 A16K> Serial Number: HV082SN
---------------------------------
Mode Density Blocksize bpi Compression
Current: 0x47:UNKNOWN variable 0 enabled (DCLZ)
---------------------------------
Current Driver State: at rest.
---------------------------------
Partition: 0 Calc File Number: 0 Calc Record Number: 0
Residual: 0 Reported File Number: 0 Reported Record Number: 0
Flags: BOP
---------------------------------
Tape I/O parameters:
Maximum I/O size allowed by driver and controller (maxio): 131072 bytes
Maximum I/O size reported by controller (cpi_maxio): 131072 bytes
Maximum block size supported by tape drive and media (max_blk): 16777215
bytes
Minimum block size supported by tape drive and media (min_blk): 1 bytes
Block granularity supported by tape drive and media (blk_gran): 0 bytes
Maximum possible I/O size (max_effective_iosize): 131072 bytes

Minimum blocksize to reach highest throughput, thus sustained write of
uncompressable data (from /dev/random): <4k at 3.2MiB/s

mt status
---------------------------------
Current Driver State: at rest.
---------------------------------
Partition: 0 Calc File Number: 7 Calc Record Number: 0
Residual: 0 Reported File Number: 7 Reported Record Number: 115634

"short READ POSITION"
camcontrol cmd $TAPE -v -c "34 0 0 0 0 0 0 0 0 0" -i 20 - | hd
00000000 30 00 00 00 00 01 c3 b2 00 01 c3 b2 00 00 00 00 |0...............|
00000010 00 00 00 00 |....|
00000014
"vendor READ POSITION"
camcontrol cmd $TAPE -v -c "34 1 0 0 0 0 0 0 0 0" -i 20 - | hd
00000000 30 00 00 00 00 01 c3 ab 00 01 c3 ab 00 00 00 00 |0...............|
00000010 00 00 00 00 |....|
00000014

"long READ POSITION"
camcontrol cmd $TAPE -v -c "34 6 0 0 0 0 0 0 0 0" -i 32 - |hd
00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 01 c3 b2 |................|
00000010 00 00 00 00 00 00 00 07 00 00 00 00 00 00 00 00 |................|
00000020

Different tapes
----------------------
Density 0x26 = PRML, 122000 bpi
DDS4 Cartridge (3.81mm DualReel, 20GB native, 150m length,):
Mode Density Blocksize bpi Compression
Current: 0x26:DDS-4 variable 97000 enabled (DCLZ)

Density 0x25 = PRML, 122000 bpi
(3.81mm DualReel, 36GB native, 125m length, )
Mode Density Blocksize bpi Compression
Current: 0x25:DDS-3 variable 97000 enabled (DCLZ)

I could also provide LTO-3 (and LTO-2) results – after I identified the
U320 killer in the bus…
Like reported earlier, LTO-2 worked like a charm.
DLT-V4 and VXA-320 will follow soon too – I'm waiting for some media.

Thanks,

-Harry

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