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Performance issue Tru64 LTO3 versus SDLT

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wendling
Regular Advisor

Performance issue Tru64 LTO3 versus SDLT

hello,
tru64 5.1b
Alphaserver ES47 with an SDLT and LTO3 on 2 separate identical SCSI busses. We use vdump for backup and we have the same performance on LTO as with SDLT.
shouldn't be Lto faster? any idea?

Thank's in advance

configuration of LTO:
CAM Equipment Device Table (EDT) Information:

Inquiry Information:

SCSI Bus ID: 1
SCSI Target ID: 5
SCSI Target LUN: 0
Peripheral Device Type: 0x1 (Sequential Access)
Peripheral Qualifier: 0 (Peripheral Device Connected)
Device Type Modifier: 0
Removable Media: Yes
ANSI Version: 3 (Complies to ANSI X3.xxx-199x, SCSI-3)
ECMA Version: 0
ISO Version: 0
Response Data Format: 2 (SCSI-2)
Normal ACA Support: No
Terminate I/O Process: No
Additional Length: 91
Reserved (byte 5): 0x10
Medium Changer Support: No
Multi-port Device Support: No
Soft Reset Support: No
Command Queuing Support: Yes
Target Transfer Disable: No
Linked Command Support: No
Synchronous Data Transfers: Yes
Support for 16 Bit Transfers: Yes
Support for 32 Bit Transfers: No
Relative Addressing Support: No
Vendor Identification: HP
Product Identification: Ultrium 3-SCSI
Firmware Revision Level: G27D

Configuration of SDLT:
Inquiry Information:

SCSI Bus ID: 6
SCSI Target ID: 4
SCSI Target LUN: 0
Peripheral Device Type: 0x1 (Sequential Access)
Peripheral Qualifier: 0 (Peripheral Device Connected)
Device Type Modifier: 0
Removable Media: Yes
ANSI Version: 2 (Complies to ANSI X3.131-1994, SCSI-2)
ECMA Version: 0
ISO Version: 0
Response Data Format: 2 (SCSI-2)
Terminate I/O Process: No
Additional Length: 53
Soft Reset Support: No
Command Queuing Support: No
Target Transfer Disable: No
Linked Command Support: Yes
Synchronous Data Transfers: Yes
Support for 16 Bit Transfers: Yes
Support for 32 Bit Transfers: No
Relative Addressing Support: No
Vendor Identification: COMPAQ
Product Identification: SDLT320
Firmware Revision Level: 5555
14 REPLIES
Rob Leadbeater
Honored Contributor

Re: Performance issue Tru64 LTO3 versus SDLT

Hi,

An LTO-3 drive should out perform an SDLT320.

I suspect that the SCSI controller may be limiting things. What cards do you have installed in the ES47...?

Cheers,

Rob
cnb
Honored Contributor

Re: Performance issue Tru64 LTO3 versus SDLT

Depends...


Which model SCSI adapter are they connected to?
wendling
Regular Advisor

Re: Performance issue Tru64 LTO3 versus SDLT

I think the scsi cards are AIC-7892
Rob Leadbeater
Honored Contributor
Solution

Re: Performance issue Tru64 LTO3 versus SDLT

It would be useful to know the exact HP part number if possible...

I'm guessing its probably a KZPEA.

http://h18002.www1.hp.com/alphaserver/products/storage/kzpea/index.html

If so, then that will only do 160Mb/s which will be the limiting factor on both your SDLT and LTO drives...

Cheers,

Rob
wendling
Regular Advisor

Re: Performance issue Tru64 LTO3 versus SDLT

Thank's Rob,
I'll check at customer site...
wendling
Regular Advisor

Re: Performance issue Tru64 LTO3 versus SDLT

the card are NCR53C895
these cards are not very fast no?
cnb
Honored Contributor

Re: Performance issue Tru64 LTO3 versus SDLT

That sounds like a KZPCA-AA:

Option Part Number
3X-KZPCA-AA

Spare Part Numbers

3X-KZPCA-AA

146094-001


SCSI Chipset
ncr53c895

Host Bus
32-bit DMA master, PCI

Number of SCSI Channels
Single Channel (with one internal, and one external port)

Transfer Rate
Synchronous:


80 MB/s Ultra2 SCSI

40 MB/s Ultra SCSI

20 MB/s Fast SCSI


Asynchronous :


14MB/s

HTH,
Rob Leadbeater
Honored Contributor

Re: Performance issue Tru64 LTO3 versus SDLT

I can't remember for certain, but I'll guess that it's only an Ultra 2 device.

This seems to tally with the initial SCSI data you prompted. That will mean you're limited to 40MB/s max.

Cheers,

Rob
wendling
Regular Advisor

Re: Performance issue Tru64 LTO3 versus SDLT

Thank's to all,
i'll se if we can use another SCSI card for the LTO
Regards
Gérard
Uwe Zessin
Honored Contributor

Re: Performance issue Tru64 LTO3 versus SDLT

SN-KZPCA-AA:
Single Channel LSI SYM 8952U
Ultra-2 LVD (=80 MegaBytes/second)
.
wendling
Regular Advisor

Re: Performance issue Tru64 LTO3 versus SDLT

What SCSI controller would you recommand for tha LTO (tru64 5.1b patch kit 6)?
Uwe Zessin
Honored Contributor

Re: Performance issue Tru64 LTO3 versus SDLT

You could try the 3X-KZPEA-DB, which is a 2-channel Ultra-3 adapter:
http://h18002.www1.hp.com/alphaserver/products/storage/kzpea/index.html

are you sure you are limited by the bus bandwidth? I've looked through this thread, but I don't have seen whether you have mentioned your current throughput.

The SDLT320 does max. 16 MegaBytes/second native (uncompressed) which is below the _minimum speed_ of an LTO-3 tape drive: 20-35 MB/s native.

Depending on the Model, LTO-3 tape drives can do 60-80 MegaBytes native. If the system cannot feed enough data to the tape drives it goes into start/stop mode (called 'shoe-shining' - which is slow, damages the media and the tape drive long-term).
.
wendling
Regular Advisor

Re: Performance issue Tru64 LTO3 versus SDLT

here are some test results:
(tape0 ist lto3 and tape1 is sdlt320)
# time /sbin/vdump -0 -f /dev/tape/tape0_d1 /data3
path : /data3
dev/fset : /dev/disk/dsk2d
type : ufs
vdump: Date of last level 0 dump: the start of the epoch
vdump: Dumping directories
vdump: Dumping 22973779405 bytes, 34 directories, 411 files
vdump: Dumping regular files
vdump: Status at Wed Jan 14 11:46:51 2009
vdump: Dumped 17607250649 of 22973779405 bytes; 76.6% completed
vdump: Dumped 18 of 34 directories; 52.9% completed
vdump: Dumped 42 of 411 files; 10.2% completed
vdump: Rewinding and unloading tape
vdump: Status at Wed Jan 14 11:49:55 2009
vdump: Dumped 22973779405 of 22973779405 bytes; 100.0% completed
vdump: Dumped 34 of 34 directories; 100.0% completed
vdump: Dumped 411 of 411 files; 100.0% completed
vdump: Dump completed at Wed Jan 14 11:49:55 2009
real 8m16.55s
user 0m39.15s
sys 1m13.21s
# time /sbin/vdump -0 -f /dev/tape/tape1_d1 /data3
path : /data3
dev/fset : /dev/disk/dsk2d
type : ufs
vdump: Date of last level 0 dump: the start of the epoch
vdump: Dumping directories
vdump: Dumping 22973779405 bytes, 34 directories, 411 files
vdump: Dumping regular files
vdump: Status at Wed Jan 14 11:56:21 2009
vdump: Dumped 17607250649 of 22973779405 bytes; 76.6% completed
vdump: Dumped 18 of 34 directories; 52.9% completed
vdump: Dumped 42 of 411 files; 10.2% completed
vdump: Rewinding and unloading tape
vdump: Status at Wed Jan 14 11:59:18 2009
vdump: Dumped 22973779405 of 22973779405 bytes; 100.0% completed
vdump: Dumped 34 of 34 directories; 100.0% completed
vdump: Dumped 411 of 411 files; 100.0% completed
vdump: Dump completed at Wed Jan 14 11:59:18 2009
real 8m30.46s
user 0m42.88s
sys 1m24.30s
# time /sbin/vdump -0 -U -f /dev/tape/tape0 /data3
path : /data3
dev/fset : /dev/disk/dsk2d
type : ufs
vdump: Date of last level 0 dump: the start of the epoch
vdump: Dumping directories
vdump: Dumping 22973779405 bytes, 34 directories, 411 files
vdump: Dumping regular files
22973
vdump: Status at Wed Jan 14 14:00:46 2009
vdump: Dumped 17607250649 of 22973779405 bytes; 76.6% completed
vdump: Dumped 18 of 34 directories; 52.9% completed
vdump: Dumped 42 of 411 files; 10.2% completed
vdump: Rewinding tape
vdump: Status at Wed Jan 14 14:03:09 2009
vdump: Dumped 22973779405 of 22973779405 bytes; 100.0% completed
vdump: Dumped 34 of 34 directories; 100.0% completed
vdump: Dumped 411 of 411 files; 100.0% completed
Page 1
Sans titre
vdump: Dump completed at Wed Jan 14 14:03:09 2009
real 7m45.33s
user 0m37.95s
sys 0m58.56s
# time /sbin/vdump -0 -U -f /dev/tape/tape1 /data3
path : /data3
dev/fset : /dev/disk/dsk2d
type : ufs
vdump: Date of last level 0 dump: the start of the epoch
vdump: Dumping directories
vdump: Dumping 22973779405 bytes, 34 directories, 411 files
vdump: Dumping regular files
vdump: Status at Wed Jan 14 13:03:39 2009
vdump: Dumped 6146282201 of 22973779405 bytes; 26.8% completed
vdump: Dumped 18 of 34 directories; 52.9% completed
vdump: Dumped 40 of 411 files; 9.7% completed
vdump: Status at Wed Jan 14 13:09:56 2009
vdump: Dumped 12542612185 of 22973779405 bytes; 54.6% completed
vdump: Dumped 18 of 34 directories; 52.9% completed
vdump: Dumped 41 of 411 files; 10.0% completed
vdump: Status at Wed Jan 14 13:20:08 2009
vdump: Dumped 22949761753 of 22973779405 bytes; 99.9% completed
vdump: Dumped 18 of 34 directories; 52.9% completed
vdump: Dumped 43 of 411 files; 10.5% completed
vdump: Rewinding tape
vdump: Status at Wed Jan 14 13:20:50 2009
vdump: Dumped 22973779405 of 22973779405 bytes; 100.0% completed
vdump: Dumped 34 of 34 directories; 100.0% completed
vdump: Dumped 411 of 411 files; 100.0% completed
vdump: Dump completed at Wed Jan 14 13:20:50 2009
real 23m22.53s
user 0m43.13s
sys 1m9.80s
Pontier
Occasional Advisor

Re: Performance issue Tru64 LTO3 versus SDLT

Bonjour,

Je suis mainteneur spécialiste stockage sur bandes et souhaiterais rentrer en contact avec vous afin de vous proposer nos services.

Cordialement.