Vito,

Next time you run the big ASM test I recommend you run a test with 2 clients
with 4 big ASM directive each.  And then kick off a group with both of those
clients in it and list those 4 "saveset" ASM for each client and see what
you get.  Also what is your Server Parallelism set to?  What is you're your
juke box max parallelism set to?  And what is your max target sessions for
the drive you are using set to?

Regards,


Chad Smykay, RHCE, LCNA
Systems Storage Administrator
Rackspace Managed Hosting (TM)


-----Original Message-----
From: Vito Maltese [mailto:vito.maltese AT CONSILIUM.EU DOT INT]
Sent: Monday, March 22, 2004 8:29 AM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU; Chad Smykay
Subject: Re: ADIC Scalar 100 + controller LSI logic 53C1010-66 with Legato
7.1.1 on Windows 2000: speed problem

Chad, Robert,

thanks for the answer.

I did my test by using bigasm as explained in bulletin legato10443.

This is the directive I used:
- bigasm -S40G: *

And I created two dummy files: so I pushed a total of 80 dummy data to a
single drive.

And this is the line I executed for forcing the backup:
save -vvv -s myserver -b myLTO2pool e:\temp\bigasm

Medium speed reported by networker is 5 Mb/s. The performance monitor
reports peaks of about 7 Mb/s.
This is the speed reported by the DLT tz89 drives... but for them it is the
native speed.


I verified the directive and the command above on another backup server
(always a Proliant ML370G3 with the same type of disks as the first one).
On this server we an HP library with LTO1 drives, using the default block
size of 64k. The maximum speed here is around 20 Mb/s, with medium aroun
17/18 Mb/s.
The I/O scsi controller used on this machine is a dual channel ultra320
(pci-x 133: the other one, the LSI 53C1010 is not pci-x... could it be
this???).

I reply to Robert:
- yes, when I changed the block size I relabeled the tapes I used for the
previous test
- yes, the disks on the Proliant ML370G3 are capable of the throughput
expected from an LTO2 drive


I'll try to connect the Adic Scalar 100 to a pci-x ultra320 controller:
I'll let you know the results.

Thanks,

Vito

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