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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