[Networker] Speed problems after HBA change from Adaptec to LSI

Hi there,


after long ongoing communication problems between the networker
software and our STK L700 LTO drives, we just decided to change some
parts of our hardware.

The OS is still a RedHat 7.3, currently with a 2.4.22 kernel with
MPTLinux patch according to
http://support.megaraid.com/support/dlcenter1/txt1/mptlinux.txt and
the networker ist still 6.1.3

We are now using three LSILogic 21320 PCI-X cards on our PCI-X
capable board, since they have been recommended to us to work fine
with NetWorker. So the setting is now as follows:

ASUS DLSW -+- LSI 21320 --- LTO --- LTO --- LTO --- Term
           |
           `- LSI 21320 --- LTO --- LTO --- Term
           |
           `- LSI 21320 --- EasyRAID --- Term
           |
           `- Adaptec 29160 --- L700e --- Term

The LTO are IBM LTO Ultrium I drives, and the EasyRAID is an
external 12-disk IDE RAID behaving as one external SCSI disk.
This is formatted as 4 partitions, used as staging devices.

But now, since we switched from Adaptec to LSI cards, we see a
massive breakdown in LTO speed. Usually we had clients saving with
about 8000 KB/s speed, now the same clients only stream about a
tenth of it, 900 KB/s ...

We didn't change anything on the installation, and now i'm quite
curious where to search for the problem, so any hints appreciated.


With kind regards,

        Frank Altpeter

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