Slow backup with DSS and Quantum SuperLoader 3

[HangaS]

Hi,

Problem Solved!

I contacted open-e support, and they still could provide me a direct anwser, they also refered to some 'cache' setting in the Adaptec controller, and there is none.

However they qouted some part of the Adaptec user manual I didn't find relevant ate first but turned out to be the solution.

I forced the SCSI negotation to only 40MB/s non Wide as I guessed it would be more tolerant. The LTO2 speed is no bigger then 40MB/s anyway.

With this setting the tape is now writing more then 90% of the time.

A previous backup took 10h for 75GB. I now made a couple of backups of 150MB in 3h! A greater improvement!

I hope this could be of help to anyone in the future.

[*j__g*]

Hi,

can you give me some advice where to change the settings of the adaptec controller. I do not find any menu/page where to do it. All I have found is the web administration of the 3ware raid controller.

Thanks.

[To-M]

Install the Adaptec Storage Manager on a Windows system then connect to the DSS IP address - use the Internal RAID connection from the Adaptec Storage Mangager.

[*j__g*]

Thanks a lot.

[HangaS]

Hi,

can you give me some advice where to change the settings of the adaptec controller. I do not find any menu/page where to do it. All I have found is the web administration of the 3ware raid controller.

Thanks.

Hi,

I made that change in the Adaptec Bios settings. CTRL-A during boot.
Then select a slower sync speed for the ID where the loader is connected.

Similar steps in this link: http://seer.entsupport.symantec.com/docs/234316.htm
I changed mine from 80 to 40MB/s

HangaS

[To-M]

Here is the setup for the Adaptec, you will need to install the ASM on a Windows system:

1. Use the Adaptec Storage Manager then Add then add next managed system
2. Leave type "Managed system (Internal RAID)" and port "34,571"
3. Enter "192.168.x.x" (your Open-E server IP) in Host name/IP addres
4. Enter "raid" in "User name" and "Password" entry
5. Push connect.
The software should be on the CD that came with the Adaptec card.