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тАО10-04-2005 01:21 AM
тАО10-04-2005 01:21 AM
I'm facing performance problems with HP Storageworks (2 SDLT 160/320).
Performance: 4Mb/s
I don't know why but I can go with 15Mb/s with this tape library and SDLT drivers.
I know that performance problems are very dificult to solve, but here it is my landscape:
Software:
Windows 2000 Server
Legato Networker 6.2
Server Protect
Hardware:
HP ML370
2 proc P3 1.4 Ghz
4 HD 18.2 Ghz (2 arrays=0+1)
768 Mb RAM
4 NIC with Gigabit
What I did:
1) Upgrade on server: +1 proc, +256 memory, +2 HD for paging file;
2) New SCSI-3 controller from HP dealer, the performance remains very bad - Performance: 4Mb/s;
3) New SCSI-3 controller from Adaptec (mod:29160) - Performance: 4Mb/s;
It's ridiculous but I did many stupid things on this situation. It's only because I'm desesperate !
Many many thanks,
Bruno Evangelista
Solved! Go to Solution.
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тАО10-04-2005 01:40 AM
тАО10-04-2005 01:40 AM
Solutionhave you tried to test your library with LTT?
There's a test that can help you to determine if your hardware is working fine
Get ltt here: http://www.hp.com/support/tapetools
Install it, choose a drive, mount a cartridge in it, run "test", choose "Write test" and check the performance.
This test write to drive a pattern generated in the server's RAM, no network and software involved.
This is a good startin point, i believe.
HTH
Claudio
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тАО10-04-2005 06:20 AM
тАО10-04-2005 06:20 AM
Re: Tape Library MSL 5026 - SDLT 160/320 - 4Mb/s only !!!!!!!
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тАО10-04-2005 08:34 AM
тАО10-04-2005 08:34 AM
Re: Tape Library MSL 5026 - SDLT 160/320 - 4Mb/s only !!!!!!!
Thank you for your help.
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тАО10-04-2005 08:41 AM
тАО10-04-2005 08:41 AM
Re: Tape Library MSL 5026 - SDLT 160/320 - 4Mb/s only !!!!!!!
Transfer rate : 4.9 MB/s (during test execution - write)
Transfer rate : 10.0 MB/s (during test execution - read)
Read/Write Test - PASSED.
The Device Analysis was completed and no problems were found. This does not guarantee a failure-free device, but rather indicates that no known problem was identified on the device.
Device Analysis - PASSED.
Connectivity Test - PASSED.
Test Script - PASSED.
What could be wrong? Why I can't increase transfer rate?
Thanks you,
Bruno
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тАО10-04-2005 10:21 AM
тАО10-04-2005 10:21 AM
Re: Tape Library MSL 5026 - SDLT 160/320 - 4Mb/s only !!!!!!!
Can you also attach a support ticket collected just after the test took place, and if possible with the tape still in the drive.
The problem may be with bad tapes, or read/write problems. this also can cause poor performnace due to lots of retry.
Another cause may be due to tape drivers or scsi drivers, try to install from differents vendors
marino
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тАО10-04-2005 10:26 AM
тАО10-04-2005 10:26 AM
Re: Tape Library MSL 5026 - SDLT 160/320 - 4Mb/s only !!!!!!!
you got a very important information: your drive(s) write at a low speed.
Try the second drive too, just to make sure you have the same problem.
I've ran once in a similar problem. It turnd out it was a setting on the SCSI card.
In my case the customer and me were dealing with an Adaptec card.
We walked thru the SCSI card Bios and we increase the SCSI speed.
Are your SCSI cards dual bus? If yes, did you connect both drives to the same bus? Try to split drives in two buses.
HTH
Claudio
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тАО10-06-2005 08:16 AM
тАО10-06-2005 08:16 AM
Re: Tape Library MSL 5026 - SDLT 160/320 - 4Mb/s only !!!!!!!
I'm putting here what I did since yesterday:
With LTT
SDLT 2
Transfer rate : 14.3 MB/s (during test execution - write)
Transfer rate : 10.0 MB/s (during test execution - read)
Read/Write Test - PASSED.
SDTL 1
Transfer rate : 14.3 MB/s (during test execution - write)
Transfer rate : 10.0 MB/s (during test execution - read)
Read/Write Test - PASSED.
Write test with 64K of block size
C:\ - Files Read: 21094
1721 MB read (21094 files) in 245 seconds with rate 7 MB/sec
TOTAL: 1721 MB read (21094 files) in 245 seconds with rate 7 MB/sec
1279 MB written (80 files) in 247 seconds at 5 MB/sec
Write test with 512K of block size
C:\ - Files Read: 21095
1721 MB read (21095 files) in 229 seconds with rate 7 MB/sec
TOTAL: 1721 MB read (21095 files) in 229 seconds with rate 7 MB/sec
Write test with 1024K of block size
C:\ - Files Read: 21095
1718 MB read (21095 files) in 265 seconds with rate 6 MB/sec
TOTAL: 1718 MB read (21095 files) in 265 seconds with rate 6 MB/sec
Checking Firmware version
MSL5026
Current Revision 0423
New Revision 0507
Firmware revision 512 has ZERO bytes (ftp://ftp.hp.com/pub/information_storage/software/ltt/firmware/LTT_COMPAQ_MSL5000_Series_0512.frm) (It's strange!)
SDLT
Current Revision v085 (both)
I think that this firmware version help me in this issue.
Now when I try to make a local backup, the speed goes to 12 Mb/sec. Very nice !
If we make the same test using other server over a network (2 NIC in HP teaming connected with 1 Gigabit, each) the speeds is 4 Mb/s.
I read a lot other problems in HP foruns and many message all over internet and my question is: Did you change anything in TCP/IP registry to improve speed in backup?
I'm meaning about:
TcpWindowSize
GlobalMaxTcpWindowSize
Tcp1323Opts
Thank you again for support and sorry for delay.
Bruno
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тАО10-08-2005 04:53 AM
тАО10-08-2005 04:53 AM
Re: Tape Library MSL 5026 - SDLT 160/320 - 4Mb/s only !!!!!!!
performance writing on two sdlt220 are poor
During backup you reach 4 MB/sec
running the device performance test (not sure this is what you run), you can reach 14,3 MB/s with both devices.
system performance ( I suppose this is the test you run) give max 7 MB/s reading data from HDD
From these result it appear that the sdlt are fine. the problem is comming from the source of your data.
Your hdd is slow, or the access is slow, or your data are highly fragmented.
If you are running backup from the lan, for sure some tuning may be neccessary to allow max throughput during Backups.
I personaly cannot give you info on these parameters, but may be Veritas can
marino
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тАО10-08-2005 05:04 AM
тАО10-08-2005 05:04 AM
Re: Tape Library MSL 5026 - SDLT 160/320 - 4Mb/s only !!!!!!!
last FW for library is 5.07, 5.12 has been suspended for a latent problem, new version available soon.