Hi,
We have two Qualstar tapelibraries with each 2 or 3 SAIT-1 (SDZ-100)
drives. They are connected to HP Proliant servers running Red Hat
Enterprise Linux 3 and 4.
For a long time I've had speed problems with the tapedrives. I could not
get more then ~ 36MB/s per channel. I've worked around this by spreading
the tapedrives over different SCSI HBA's, but now I finally found some
time to look into this problem.
The devices are connected to LSI Fusion HBA's, which should be able to
connect at 320MB/s ultra wide. The drives should have ultra 160 wide
SCSI interfaces.
After some searching on the Internet I found the 'lsiutil' Linux
software with which I could finally see at which speed and width the
devices are connected, and I was very surprised that the devices had
negotiated 'Ultra2 Narrow, 40 MB/sec'.
I verified this on all devices in both systems, and all tapedrives are
connected at that speed....
I cannot find any settings within the LSI BIOS which can change this,
and also within the lsiutil software I cannot find any options....
I've installed the latest available LSI driver for Red Hat Enterprise
Linux 4, but this changed nothing.
Does anyone have an idea on how to make the devices run at ultra 160 wide?
Thanks,
Dennis
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