Did you erase the tapes or use new tapes after setting the block size?
It seems like you set it correctly for the controller and tape drive.
Is the I/O disk on the server capable of faster throughput?

Robert Maiello
Thomson Healtchare



On Fri, 19 Mar 2004 16:01:49 -0600, Chad Smykay <csmykay AT RACKSPACE DOT COM> 
wrote:

>Vito,
>
>How many clients did you have backing up when you did your test?  How many
>save sets per client did you specify?  I can push my LTO-2 drives up to over
>50/Mbps sustained and good average of 30/Mbps.  But I am pushing a lot of
>data to these drives usually 6-8 servers with about 12-14 save sets.  If you
>want to see that could of push on your drives you really have to be pushing
>a lot of data to the drives as well as sustained data.  Do you have multiple
>drives?  Did you try and use just one drive with multiple clients and save
>sets?  If not you can always use the BigASM ASM to create a lot of "pretend"
>data for each client.  Let us know how you are pushing the drives and we
>should be able to help.
>
>Thanks,
>
>
>Chad Smykay, RHCE, LCNA
>Systems Storage Administrator
>Rackspace Managed Hosting (TM)
>210-892-4025 ext 1603
>Cell: 210-273-2344
>
>-----Original Message-----
>From: Legato NetWorker discussion [mailto:NETWORKER AT LISTMAIL.TEMPLE DOT 
>EDU] On
>Behalf Of Vito Maltese
>Sent: Friday, March 19, 2004 5:39 AM
>To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
>Subject: [Networker] ADIC Scalar 100 + controller LSI logic 53C1010-66 with
>Legato 7.1.1 on Windows 2000: speed problem
>
>Hello,
>
>We installed yesterday a new ADIC Scalar 100 with LTO Ultrium 2 drives.
>
>For connecting the library above we used a SCSI I/O controller LSI Logic LSI
>53C1010-66 (see
>http://www.lsilogic.com/files/docs/marketing_docs/storage_stand_prod/raid/l
>si53c1010_pb.pdf).
>
>This controller has been installed on an Intel-based server (a Compaq/HP
>Proliant ML370G3) running Windows 2000 server and the proper driver
>(SYM_U3.SYS) has been installed.
>
>On the Windows 2000 server above we have a Legato Networker server version
>7.1.1 where also another library (DLT) in connected to another I/O
>controller.
>The new Scalar 100 has been correctly recognized and configured via
>jbconfig.
>
>This below is an output of the inquire command:
>
>[email protected]:HL-DT-STDVD-ROM GDR8161B1102|CD-ROM
>[email protected]:DEC     TL800    (C) DEC0525|Autochanger (Jukebox)
>        S/N: 3G0BCR85H038
>        ATNN:DEC     TL800    (C)
>DEC3G0BCR85H038
>        IENN:00900D2412A104D8
>[email protected]:DEC     TZ89     (C) DEC296D|Tape, \\.\Tape0
>[email protected]:DEC     TZ89     (C) DEC296D|Tape, \\.\Tape1
>        S/N: PXA46S0107
>[email protected]:COMPAQ  SCSI COMMUNICATECISS|Unknown Device Type
>[email protected]:COMPAQ  LOGICAL VOLUME  2.86|Disk, \\.\PHYSICALDRIVE0
>
>WWNN:600508B100104246464F424739370000
>[email protected]:COMPAQ  LOGICAL VOLUME  2.86|Disk, \\.\PHYSICALDRIVE1
>
>WWNN:600508B100104246464F424739370001
>[email protected]:ADIC    Scalar 100      3.10|Autochanger (Jukebox)
>        S/N: ADIC9F0014121
>[email protected]:IBM     ULTRIUM-TD2     37RG|Tape, \\.\Tape2
>        S/N: 1110101853
>        ATNN:IBM     ULTRIUM-TD2
>1110101853
>[email protected]:IBM     ULTRIUM-TD2     37RG|Tape, \\.\Tape3
>        S/N: 1110101880
>        ATNN:IBM     ULTRIUM-TD2
>1110101880
>
>
>
>I did some test speed using the bigasm directive on the same server where
>the library is connected (no network interaction...) and now we have the
>problem: the maximum speed obtained is 7 Mb/s. According to the specs, the
>mounted IBM LTO2 drives should offer a transfer rate around 35 Mb/s...
>
>Following the Legato Networker Performance Tuning Guide, I modified the
>block size for the LTO2 drives. Default value for Legato on Windows 2000
>with LTO2 drives is 64k, I set is to 256k with this method:
>
>- using the environment NSR_DEV_BLOCK_SIZE_LTO_ULTRIUM_2
>- modifing the registry value at
> [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Sym_u3
>\Parameters\Device]
> "MaximumSGList"=dword:00000041
>
>Speed is always the same even after the block size modification...
>
>
>
>Thanks for any possible help.
>
>
>
>
>Vito
>
>--
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